Title of Invention	A TEXT ENTRY SYSTEM
Abstract	There is disclosed an enhanced text entry system which uses word-level analysis to automatically correct inaccuracies in user keystroke entries on reduced keyboards such as those implemented on a touch-sensitive panel or display screen, or on mechanical keyboard systems. A method and system are defined which determine one or more alternate textual interpretations of each sequence of inputs detected within a designated auto-correcting keyboard region. The actual contact locations for the keystrokes may occur outside the boundaries of the specific keyboard key regions associated with the actual characters of the word interpretations proposed or offered for selection, where the distance from each contact location to each corresponding intended character may in general increase with the expected frequency of the intended word in the language or in a particular context. Likewise, in a mechanical keyboard system, the keys actuated may differ from the keys actually associated with the letters of the word interpretations. Each such sequence corresponds to a complete word, and the user can easily select the intended word from among the generated interpretations. Additionally, when the system cannot identify a sufficient number of likely word interpretation candidates of the same length as the input sequence, candidates are identified whose initial letters correspond to a likely interpretation of the input sequence. The approach utilizes the information contained in the entire sequence of keystrokes corresponding to a word in order to determine the user’s likely intention for each character of the sequence. The system also accommodates punctuation characters such as hyphens or apostrophes that are commonly embedded in words such as hyphenated compounds and contractions in English, and characters with special diacritics such as are commonly found in various European languages, e.g., diacritic accent. Special functions may be applied depending on where the user touches the intended string in a displayed word selection list. Once the user selects the desired string, it is automatically “accepted” for output and the next input detected starts a new input sequence corresponding to the entry of a next word. (FIG.1a)

Title of Invention

A TEXT ENTRY SYSTEM

Abstract

There is disclosed an enhanced text entry system which uses word-level analysis to automatically correct inaccuracies in user keystroke entries on reduced keyboards such as those implemented on a touch-sensitive panel or display screen, or on mechanical keyboard systems. A method and system are defined which determine one or more alternate textual interpretations of each sequence of inputs detected within a designated auto-correcting keyboard region. The actual contact locations for the keystrokes may occur outside the boundaries of the specific keyboard key regions associated with the actual characters of the word interpretations proposed or offered for selection, where the distance from each contact location to each corresponding intended character may in general increase with the expected frequency of the intended word in the language or in a particular context. Likewise, in a mechanical keyboard system, the keys actuated may differ from the keys actually associated with the letters of the word interpretations. Each such sequence corresponds to a complete word, and the user can easily select the intended word from among the generated interpretations. Additionally, when the system cannot identify a sufficient number of likely word interpretation candidates of the same length as the input sequence, candidates are identified whose initial letters correspond to a likely interpretation of the input sequence. The approach utilizes the information contained in the entire sequence of keystrokes corresponding to a word in order to determine the user’s likely intention for each character of the sequence. The system also accommodates punctuation characters such as hyphens or apostrophes that are commonly embedded in words such as hyphenated compounds and contractions in English, and characters with special diacritics such as are commonly found in various European languages, e.g., diacritic accent. Special functions may be applied depending on where the user touches the intended string in a displayed word selection list. Once the user selects the desired string, it is automatically “accepted” for output and the next input detected starts a new input sequence corresponding to the entry of a next word. (FIG.1a)

Full Text	CROSS REFERENCE TO RELATED APPLICATIONS This application is a Continuation of U.S. Patent Application Serial No. 09/580,319, filed on May 26, 2000, and entitled Keyboard System With Automatic Correction, which is incorporated herein in its entirety by this reference made thereto. TECHNICAL FIELD OF THE INVENTION The invention provides keyboard systems that auto-correct "sloppy" text input due to errors in touching a keyboard or screen. More specifically, the invention provides a reduced keyboard such as those implemented on a touch-sensitive panel or display screen and to mechanical keyboard systems, using word-level analysis to resolve inaccuracies (sloppy text entry) in user entries. This invention is in the field of keypad input preferably for small electronic devices. BACKGROUND OF THE INVENTION For many years, portable computers have been getting smaller and smaller. The principal size-limiting component in the effort to produce a smaller portable computer has been the keyboard. If standard typewriter-size keys are used, the portable computer must be at least as large as the keyboard. Miniature keyboards have been used on portable computers, but the miniature keyboard keys have been found to be too small to be easily or quickly manipulated with sufficient accuracy by a user. Incorporating a full-size keyboard in a portable computer also hinders true portable use of the computer. Most portable computers cannot be operated without placing the computer on a flat work surface to allow the user to type with both hands. A user cannot easily use a portable computer while standing or moving. In the latest generation of small portable computers, called Personal Digital Assistants (PDAs), companies have attempted to address this problem by incorporating handwriting recognition software in the PDA. A user may directly enter text by writing on a touch- sensitive panel or display screen. This handwritten text is then converted into digital data by the recognition software. Unfortunately, in addition to the fact that printing or writing with a pen is in general slower than typing, the accuracy and speed of the handwriting recognition software has to date been less than satisfactory. To make matters worse, today"s handheld computing devices which require text input are becoming smaller still. Recent advances in two-way paging, cellular telephones, and other portable wireless technologies has led to a demand for small and portable two- way messaging systems, and especially for systems which can both send and receive electronic mail ("e-mail"). It would therefore be advantageous to develop a much smaller keyboard for entry of text into a computer. As the size of the keyboard is reduced, the user encounters greater difficulty selecting the character of interest. In general there are two different types of keyboards utilized in such portable devices. One is the familiar mechanical keyboard consisting of a set of mechanical keys that are activated by depressing them with a finger or thumb. However, these mechanical keyboards tend to be significantly smaller than the standard sized keyboards associated with typewriters, desktop computers, and even "laptop" computers. As a result of the smaller physical size of the keyboard, each key is smaller and in closer proximity to neighboring keys. This increases the likelihood that the user will depress an unintended key, and the likelihood of keystroke errors tends to increase the faster the user attempts to type. Another commonly used type of keyboard consists of a touch-sensitive panel on which some type of keyboard overlay has been printed, or a touch-sensitive display screen on which a keyboard overlay can be displayed. Depending on the size and nature of the specific keyboard, either a finger or a stylus can be used to contact the panel or display screen within the area associated with the key that the user intends to activate. Due to the reduced size of many portable devices, a stylus is often used in order to attain sufficient accuracy in contacting the keyboard to activate each intended key. Here again, the small overall size of such keyboards results in a small area being associated with each key so that it becomes quite difficult for the average user to type quickly with sufficient accuracy. One area of prior development in mechanical keyboards has considered the use of keys that are much smaller than those found on common keyboards. With smaller keys, the user must take great care in controlling each key press. One approach (U.S. Patent 5,612,690) proposes a system that uses up to four miniature keys in unison to define primary characters (the alphabet) and nests secondary character rows (like numbers) between primary character rows. Selecting a secondary character involves depressing the miniature key from each of the surrounding primary characters. Grouping the smaller keys in this fashion creates a larger apparent virtual key composed of four adjacent smaller keys, such that the virtual key is large enough to be depressed using a finger. However, the finger must contact the keys more or less precisely on the "cross-hairs" of the boundaries between the four adjacent keys in order to depress them in unison. This makes it still difficult to type quickly with sufficient accuracy. Another area of prior development in both touch screen and mechanical keyboards has considered the use of a much smaller quantity of full-size keys. With fewer keys, each single key press must be associated with a plurality of letters, such that each key activation is ambiguous as to which letter is intended. As suggested by the keypad layout of a touch-tone telephone, many of the reduced keyboards have used a 3-by-4 array of keys, where each key is associated with three or four characters (U.S. Patent 5,818,437). Several approaches have been suggested for resolving the ambiguity of a keystroke sequence on such a keyboard. While this approach has merit for such keyboards with a limited number of keys, it is not applicable to reduced size keyboards with a full complement of keys. Another approach in touch screen keyboards has considered analyzing the immediately preceding few characters in order to determine which character should be generated for a keystroke that is not close to the center of the display location of a particular character (U.S. Patent 5,748,512). When the keyboard is displayed on a small touch screen, keystrokes that are off-center from a character are detected. Software compares the possible text strings of probable sequences of two or three typed characters against known combinations, such as a history of previously typed text or a lexicon of text strings rated for their frequency within a context. When the character generated by the system is not the character intended by the user, the user must correct the character before going on to select the a following character, because the generated character will be used to determine probabilities for the following keystroke. The fundamental problem is that the specific activations that result from a user"s attempts to activate the keys of a keyboard do not always precisely conform to the intentions of the user. On a touch screen keyboard, the user"s finger or stylus may hit the wrong character or hit between keys in a boundary area not associated with a specific character. With a miniaturized mechanical keyboard, a given keypress may activate the wrong key, or may activate two or more keys either simultaneously or with a "roll-over" motion that activates adjacent keys in a rapid sequence. Other examples include common keyboards operated by users with limited ranges of motion or motor control, where there is a limited ability to consistently strike any particular space or key, or where the limb (such as in the case of an amputee, or the use of gloved hands or gloved fingers) or the device used to make the entry (such as a stylus) is far larger than the targeted key or character space. SUMMARY OF THE INVENTION Accordingly, the present invention provides a text entry system comprising : (a) a user input device comprising an auto-correcting keyboard region comprising a plurality of the characters of an alphabet, wherein each of the plurality of characters corresponds to a location with known coordinates in the auto-correcting keyboard region, wherein each time a user interacts with the user input device within the auto-correcting keyboard region, a location associated with the user interaction is determined and the determined interaction location is added to a current input sequence of contact locations ; (b) a memory containing a plurality of objects, wherein each object is further associated with a promotion value, and wherein each of the plurality of objects in memory is further associated with one or a plurality of predefined groupings of objects; (c) an output device with a text display area ; and (d) a processor coupled to the user input device, memory, and output device, said processor comprising : (i) a distance value calculation component which, for each determined interaction location in the input sequence of interactions, calculates a set of distance values between the interaction locations and the known coordinate locations corresponding to one or a plurality of characters within the auto-correcting keyboard region ; (ii) a word evaluation component which, for each generated input sequence, identifies one or a plurality of candidate objects in memory, and for each of the one or a plurality of identified candidate objects, evaluates each identified candidate object by calculating a matching metric based on the calculated distance values and the promotion value associated with the object, and ranks the evaluated candidate objects based on the calculated matching metric values ; (iii) a selection component for identifying one or a plurality of candidate objects according to their evaluated ranking, presenting the identified objects to the user, and enabling the user to select one of the presented objects for output to the text display area on the output device; and (iv) a promotion component for setting a relative promotion value associated with each object in memory as a function of the user setting interaction with said plurality of objects. The present invention provides an enhanced text entry system that uses word-level disambiguation to automatically correct inaccuracies in user keystroke entries. Specifically, the present invention provides a text entry system comprising: (a) a user input device comprising a touch sensitive surface including an auto-correcting keyboard region comprising a plurality of the characters of an alphabet, wherein each of the plurality of characters corresponds to a location with known coordinates in the auto-correcting keyboard region, wherein each time a user contacts the user input device within the auto-correcting keyboard region, a location associated with the user contact is determined and the determined contact location is added to a current input sequence of contact locations; (b) a memory containing a plurality of objects, wherein each object is a string of one or a plurality of characters forming a word or a part of a word, wherein each object is further associated with a frequency of use; (c) an output device with a text display area; and (d) a processor coupled to the user input device, memory, and output device, said processor comprising: (i) a distance value calculation component which, for each determined contact location in the input sequence of contacts, calculates a set of distance values between the contact locations and the known coordinate locations corresponding to one or a plurality of characters within the auto-correcting keyboard region; (ii) a word evaluation component which, for each generated input sequence, identifies one or a plurality of candidate objects in memory, and for each of the one or a plurality of identified candidate objects, evaluates each identified candidate object by calculating a matching metric based on the calculated distance values and the frequency of use associated with the object, and ranks the evaluated candidate objects based on the calculated matching metric values; and (iii) a selection component for (a) identifying one or a plurality of candidate objects according to their evaluated ranking, (b) presenting the identified objects to the user, enabling the user to select one of the presented objects for output to the text display area on the out device. Preferably, the selection component further comprises (c) resetting the current input sequence of contact locations to an empty sequence upon detecting the selection by the user of one of the presented objects for output to the text display area on the output device. Preferably, (a) each of the plurality of objects in memory is further associated with one or a plurality of predefined groupings of objects; and (b) the word evaluation component, for each generated input sequence, limits the number of objects for which a matching metric is calculated by identifying one or a plurality of candidate groupings of the objects in memory, and for one or a plurality of objects associated with each of the one or a plurality of identified candidate groupings of objects, calculates a matching metric based on the calculated distance values and the frequency of use associated with each candidate object, and ranks the evaluated candidate objects based on the calculated matching metric values. This reduces the calculation required since, conversely, one or more groupings of objects are identified as containing no candidate objects for a given input sequence of contacts, such that a matching metric need not be calculated for any object in the groupings so identified. Preferably, the characters of the alphabet are arranged on the auto-correcting keyboard region in approximately a standard "QWERTY" layout. Most preferably, the width to height ratio of the auto-correcting keyboard region is approximately 2 to 1, or the width to height ratio of the auto-correcting keyboard region is less than 2 to 1. In one embodiment, one or a plurality of the characters arranged on the auto- correcting keyboard region are illegible. Preferably, the auto-correcting keyboard region includes one or a plurality of known locations associated with one or a plurality of punctuation characters, wherein the memory includes one or a plurality of objects in memory which include one or a plurality of the punctuation characters associated with locations in the auto- correcting keyboard region. Preferably, the objects in memory are further associated with one or a plurality of modules, wherein each module comprises a set of objects with one or a plurality of common characteristics. In one embodiment, the text entry system comprises a module selector whereby a user can determine which modules are to be evaluated by the word evaluation component in order to identify candidate objects. In another embodiment, the plurality of modules comprises word stem modules and suffix modules, wherein each word stem module comprises a logical organization of uninflected word stem objects, and wherein each suffix module comprises a logical organization of suffixes which can be appended to word stems to form inflected words, whereby each word stem module is associated with one or a plurality of suffix modules, whereby whenever the word evaluation component calculates a matching metric value for a given word stem in a given word stem module with respect to an initial sequence of contacts within an input sequence such that the calculated matching metric value ranks higher than a predetermined threshold, the word evaluation component evaluates the remaining contacts of the input sequence with respect to the associated suffix modules, whereby whenever the word evaluation component calculates a matching metric value for a given suffix in one of said associated suffix modules that ranks higher than a second predetermined threshold, said suffix is appended to said word stem to form a completed word corresponding to a matching metric value that is a function of said determined word stem matching metric value and said determined suffix matching metric value. Preferably, the word evaluation component calculates the matching metric for each candidate object by summing the distance values calculated from each contact location in the input sequence to the location assigned to the character in the corresponding position of the candidate object, and applying a weighting function according to the frequency of use associated with the object. In addition, each character of the alphabet associated with the auto-correcting keyboard region is assigned a Cartesian coordinate and wherein the distance value calculation component calculates the distance between the contact location and the location corresponding to a character according to standard Cartesian coordinate distance analysis. Further, each character of the alphabet associated with the auto-correcting keyboard region is assigned a Cartesian coordinate and wherein the distance value calculation component calculates the distance between the contact location and the location corresponding to a character as the square of the standard Cartesian coordinate distance. The distance values are placed in a table. In addition, each location on the auto-correcting keyboard region is defined by a horizontal and a vertical coordinate, and wherein the distance value between a contact location and the known coordinate location corresponding to a character comprises a horizontal and a vertical component, wherein the vertical component is adjusted by a weighting factor in calculating the distance of the contact location from the character. The word evaluation component adds an increment value to the sum of the distance values prior to applying a weighting function according to the frequency of use associated with the candidate object. Most preferably, the increment value is a fixed value that is approximately twice the average distance between adjacent locations on the auto-correcting keyboard region corresponding to characters. The frequency of use associated with each candidate object in memory comprises the ordinal ranking of the object with respect to other objects in memory, wherein an object associated with a higher relative frequency corresponds to a numerically lower ordinal ranking. Most preferably, the frequency weighting function applied by the word evaluation component to the summed distance values for a candidate object comprises multiplying the sum of the distance values by the base 2 logarithm of the ordinal ranking of the object. Preferably, objects in memory are stored such that the objects are classified into groupings comprising objects of the same length. The word evaluation component limits the number of objects for which a matching metric is calculated by initially identifying candidate groupings of objects of the same length as the number of inputs in the input sequence. Most preferably, if fewer than a threshold number of candidate objects are evaluated to have a matching metric score better than a threshold value, the word evaluation component identifies candidate groupings of objects of progressively longer lengths and calculates the matching metric for the objects in the identified groupings until said threshold number of candidate objects are evaluated to have a matching metric score better than said threshold. Further, the word evaluation component calculates the matching metric for each candidate object by summing the distance values calculated from each contact location in the input sequence to the location assigned to the character in the corresponding position of the candidate object and adding an increment value, and applying to this sum a weighting function according to the frequency of use associated with the object, and wherein the increment value added to the sum of the distance values is a value that is based on the difference between the number of characters in the candidate object and the number of inputs in the current input sequence. Preferably, the word evaluation component calculates the matching metric for each candidate object by summing the distance values calculated from each contact location in the input sequence to the location assigned to the character in the corresponding position of the candidate object, and applying a weighting function according to the frequency of use associated with the object. Most preferably, the frequency of use associated with each candidate object in memory comprises the ordinal ranking of the object with respect to other objects in one or a plurality of sub- groupings in memory with which said object is associated, wherein an object associated with a higher relative frequency corresponds to a numerically lower ordinal ranking. In addition, for each calculated distance value between a contact location in the input sequence and the known coordinate location corresponding to a character within the auto-correcting keyboard region wherein said calculated distance exceeds a threshold distance value, for each object in memory in which said character occurs at a position in the sequence of the characters of said object corresponding to the position of said contact location in said input sequence, said object is ranked by the word evaluation component as an object that is excluded from presentation to the user for selection. One or a plurality of the identified candidate groupings of the objects in memory comprise objects that are excluded from presentation to the user for selection, wherein at least one of the calculated distance values included in the calculated sum of distance values for each object in said one or identified candidate groupings of objects exceeds a threshold distance value. The auto-correcting keyboard region is separated into two or more predefined clustering regions, each of which contains the known locations of one or a plurality of characters, and wherein each objects in memory is assigned to a predefined group according to which of said two or more predefined clustering regions contain the known locations corresponding to one or a plurality of the initial characters of said object. In one embodiment, the auto-correcting keyboard region is separated into three predefined clustering regions, and wherein each object in memory is assigned to one of nine predefined groupings based which of the three predefined clustering regions contain the known locations corresponding to each of the first two characters of said object. Preferably, for each character corresponding to a known location in the auto- correcting keyboard region, a region is predefined around one or a plurality of said known locations wherein the distance between an input contact location falling within said predefined region and the known character location within said predefined region is calculated as a distance of zero. Most preferably, the relative sizes of said predefined regions correspond to the relative frequencies of occurrence of the characters associated with the known locations within said predefined regions. The predefined region around the known location of a character corresponds to a displayed key on the touch screen. Further, at least one of the locations with known coordinates in the auto-correcting keyboard region corresponds to a plurality of characters, one or a plurality of which include various diacritic marks, wherein the plurality of characters comprise variant forms of a single base character, and wherein objects in memory are stored with their correct accented characters. Preferably, the selection component presents the identified one or a plurality of candidate objects for selection by the user in a candidate object list in the text display area. Most preferably, the selection component identifies the highest ranked candidate object and presents the identified object in the candidate object list in the position nearest to the auto-correcting keyboard region. In addition, user selection of a character that is associated with a contact outside of the auto-correcting keyboard region accepts and outputs the determined highest ranked candidate object at a text insertion point in the text display area prior to outputting the selected character at the text insertion point in the text display area. The user selection of an object for output at a text insertion point in the text display area terminates the current input sequence such that the next contact within the auto-correcting keyboard region starts a new input sequence. In addition, the selection component detects a distinctive manner of selection that is used to select a candidate object, and wherein upon detecting that an object has been selected through said distinctive manner, the system replaces the current input sequence of actual contact locations with an input sequence of contact locations corresponding to the coordinate locations of the characters comprising the selected object, and wherein a next contact in the auto-correcting keyboard region is appended to the current input sequence. Preferably, the word evaluation component determines, for each determined contact location in each input sequence of contact locations, the closest known location corresponding to a character, and constructs an exact typing object composed of said determined corresponding characters in the order corresponding to the input sequence of contact locations. Most preferably, for each input sequence of contact locations, the selection component presents said exact typing object to the user for selection. Further, when the user selects said exact typing object for output to the text display area on the output device and said exact typing object is not already included as one of the objects in memory, said exact typing object is added to the memory. Prior to displaying the exact typing object to the user for selection, the selection component compares the exact typing object to a database of offensive objects, each of which is associated with an acceptable alternative object for display, and if a match is found, replaces the exact typing object with the associated acceptable object for presentation to the user. Preferably, the selection component identifies the highest ranked candidate object and presents the identified object at the text insertion point in the text display area on the output device. Most preferably, the text entry system includes a select key region associated with an object selection function, wherein when said select key region is contacted, the object presented at the text insertion point in the text display area on the output device is replaced with next highest ranked object of the identified one or a plurality of candidate objects. Preferably, the text entry system includes a delete key region associated with a delete function, wherein when the current input sequence includes at least one contact and said delete key region is contacted, the last input contact from the current input sequence of contacts is deleted, without terminating the current input sequence. In another preferred embodiment, the text entry system includes an Edit Word key region associated with an Edit Word function, wherein when no current input sequence exists and said Edit Word key region is contacted: (i) when the text insertion point in the text display area on the output device is contained within a previously output word, the system establishes a new current input sequence consisting of a sequence of contact locations corresponding to the coordinate locations associated with the characters of said word, and (ii) when the text insertion point in the text display area on the output device is located between two previously output words, the system establishes a new current input sequence consisting of a sequence of contact locations corresponding to the coordinate locations associated with the characters of the word adjacent to the text insertion point, and wherein the text entry system processes said new current input sequence and determines a corresponding ranking of new candidate objects, and wherein selection of one of the new candidate objects replaces the previously output word used to establish said new current input sequence. Preferably, as the user enters an input sequence by performing a sequence of contact actions within the auto-correcting keyboard region, the processor determines the location associated with each user contact action by recording each contact action in the sequence as an indexed primary set of a fixed number of two or more regularly spaced contact points along the path traced out by the user contact action, and by assembling two or more corresponding secondary sets of contact points by taking, for each of the two or more possible primary index values, the sequence of contact points having the same index value, one from each recorded indexed primary set of contact points, and by determining with respect to each word is selected by the user for output, a minimizing primary index value that identifies the assembled secondary set of contact points for which the calculated distance between the assembled secondary set of contact points and the known locations corresponding to the characters of the selected word is minimized, and whereby for a next input sequence of user contact actions, the distance value calculation component calculates distance values based on a sequence of contact locations determined as the secondary set of contact point locations assembled from said next input sequence of contact actions corresponding to the determined minimizing primary index value. Most preferably, for a plurality of user input sequences, the distance value calculation component computes a running average of the distance calculations for each of the two or more assembled secondary sets corresponding to the two or more primary index values, and whereby for a next input sequence of contact actions, the distance value calculation component calculates distance values based on a sequence of contact locations determined as the secondary set of contact point locations assembled from said next input sequence of contact actions corresponding to the minimizing primary index value determined with respect to said computed running averages. Further, for each primary index value, the distance value calculation component computes a running average of the horizontal and vertical components of the offset of the coordinate location corresponding to each character of each selected word with respect to the coordinate location of each corresponding recorded indexed contact point, and wherein in performing distance calculations for the word evaluation component, the distance value calculation component adjusts the horizontal and vertical coordinates of each recorded indexed contact point by an amount that is a function of the average horizontal and vertical offsets computed with respect to the corresponding primary index value. Preferably, for each input contact location, the distance value calculation component computes a running average of the horizontal and vertical components of the offset of the coordinate location corresponding to each character of each selected word with respect to the coordinates of each corresponding input contact location, and wherein in performing distance calculations for the word evaluation component, the distance value calculation component adjusts the horizontal and vertical coordinates of each input contact location by amounts that are functions of the computed average signed horizontal and vertical offsets. Alternatively, the processor further comprises a stroke recognition component that determines for each user contact action within the auto-correcting keyboard region whether the point of contact is moved less than a threshold distance from the initial contact location prior to being lifted from the touch sensitive surface, whereby: (a) when the point of contact is moved less than a threshold distance from the initial contact location prior to being lifted from the touch sensitive surface, the stroke recognition component determines that the user contact is a tap contact, and the location determined to be associated with the user contact is added to the current input sequence of contact locations to be processed by the distance value calculation component, the word evaluation component, and the selection component, and b) when the point of contact is moved greater than or equal to a threshold distance from the initial contact location prior to being lifted from the touch sensitive surface, the stroke recognition component determines that the user contact is one of a plurality of stroke contacts that are associated with known system functions, and classifies the stroke contact as one of the plurality of predefined types of stroke contacts. Preferably, when a threshold number of contact locations in the input sequence are further than a threshold maximum distance from the corresponding character in the sequence of characters comprising a given candidate object, said object is identified as no longer being a candidate object for the selection component. Alternatively, the processor further comprises a frequency promotion component for adjusting the frequency of use associated with each object in memory as a function of the number of times the object is selected by the user for output to the text display area on the output device. Moreover, the frequency of use associated with each object in memory comprises the ordinal ranking of the object with respect to other objects in memory, wherein an object associated with a higher relative frequency corresponds to a numerically lower ordinal ranking, and wherein when an object is selected for output by the user, the frequency promotion component adjusts the ordinal ranking associated with said selected object by an amount that is a function of the ordinal ranking of said object prior to said adjustment. Further, the function used by the frequency promotion component to determine the amount by which the ordinal ranking associated with a selected object is adjusted reduces said amount for objects with ordinal rankings that are associated with relatively higher frequencies of use. The frequency promotion component analyzes additional information files that are accessible to the text entry system to identify new objects contained in said files that are not included among the objects already in said memory of said text entry system, and wherein said newly identified objects are added to the objects in memory as objects that are associated with a low frequency of use. Further, the frequency of use associated with a newly identified object that is added to the objects in memory is adjusted by the frequency promotion component as a function of the number of times that the newly identified object is detected during the analysis of said additional information files. Preferably, the processor further comprises a frequency promotion component for adjusting the frequency of use associated with each object in memory as a function of the number of times the object is selected by the user for output to the text display area on the output device with respect to other objects associated with the same predefined grouping. Most preferably, when an object is selected by the user for output to the text display a>ea on the output device, the frequency promotion component increases the value of the frequency associated with the selected object by a relatively large increment, and decreases by a relatively small decrement the frequency associated with unselected objects that are associated with the same grouping as the selected object. Alternatively, information regarding the capitalization of one or a plurality of objects is stored along with the objects in memory and wherein the selection component presents each identified object in a preferred form of capitalization according to the stored capitalization information. In another embodiment, one or a plurality of objects in memory are associated with a secondary object in memory comprising a sequence of one or a plurality of letters or symbols, and wherein when the selection component identifies one of said objects for presentation to the user based on the matching metric calculated by the word evaluation component, the selection component presents the associated secondary object for selection. The present invention further provides a text entry system comprising: (a) a user input device comprising a keyboard constructed with mechanical keys including an auto-correcting keyboard region comprising a plurality of keys, each corresponding to a character of an alphabet and each at a known coordinate location, wherein each time a user activates one or a plurality of adjacent keys in the auto-correcting keyboard region within a predetermined threshold period of time to generate a key activation event, a determined location corresponding to the key activation event is appended to a current input sequence of the determined locations of the key activation events; (b) a memory containing a plurality of objects, wherein each object is a string of one or a plurality of characters forming a word or a part of a word, wherein each object is further associated with a frequency of use; (c) an output device with a text display area; and (d) a processor coupled to the user input device, memory, and output device, said processor comprising: (i) a distance value calculation component which, for each generated key activation event location in the input sequence of key activation events, calculates a set of distance values between the key activation event location and the known coordinate locations corresponding to one or a plurality of keys within the auto-correcting keyboard region; (ii) a word evaluation component which, for each generated input sequence, identifies one or a plurality of candidate objects in memory, and for each of the one or a plurality of identified candidate objects, evaluates each identified candidate object by calculating a matching metric based on the calculated distance values and the frequency of use associated with the object, and ranks the evaluated candidate objects based on the calculated matching metric values; and (iii) a selection component for identifying one or a plurality of candidate objects according to their evaluated ranking, presenting the identified objects to the user, and enabling the user to select one of the presented objects for output to the text display area on the output device. Preferably, (a) each of the plurality of objects in memory is further associated with one or a plurality of predefined groupings of objects; and (b) the word evaluation component, for each generated input sequence, limits the number of objects for which a matching metric is calculated by identifying one or a plurality of candidate groupings of the objects in memory, and for one or a plurality of objects associated with each of the one or a plurality of identified candidate groupings of objects, calculates a matching metric based on the calculated distance values and the frequency of use associated with each candidate object, and ranks the evaluated candidate objects based on the calculated matching metric values. Further, the keys associated with the characters of the alphabet are arranged in the auto-correcting keyboard region in approximately a standard "QWERTY" layout. Preferably, when a key activation event is detected comprising the simultaneous activation of a plurality of adjacent keys in the auto-correcting keyboard region, a location corresponding to said key activation event is determined as a function of the locations of the simultaneously activated keys, and said determined location is appended to the current input sequence of the locations of the key activation events. Most preferably, the function used to determine the location of said key activation event comprises the computation of the location corresponding to the center of the locations of the simultaneously activated keys. Further, the function used to determine the location of said key activation event comprises the computation of the location corresponding to the weighted center of gravity of the locations of the simultaneously activated keys, wherein the weights associated with each of the keys in the auto-correcting keyboard region correspond to the relative frequencies of occurrence of the characters associated with the keys, wherein said relative frequencies are determined with respect to the frequencies of occurrence of the characters in the objects in memory. Preferably, when a key activation event is detected comprising the activation of a plurality of adjacent keys in the auto-correcting keyboard region within a predetermined threshold period of time, wherein at all times during said key activation event at least one of said plurality of adjacent keys is activated and wherein at any moment during said key activation event that any subset of said plurality of keys is simultaneously activated, said simultaneously activated subset of keys comprises keys that are contiguously adjacent, a location corresponding to said key activation event is determined as a function of the locations of the entire plurality of adjacent keys detected during said key activation event, and said determined location is appended to the current input sequence of the locations of the key activation events. Most preferably, the function used to determine the location of said key activation event comprises the computation of the location corresponding to the center of the locations of the simultaneously activated keys. Further, the function used to determine the location of said key activation event comprises the computation of the location corresponding to the weighted center of gravity of the locations of the simultaneously activated keys, wherein the weights associated with each of the keys in the auto-correcting keyboard region correspond to the relative frequencies of occurrence of the characters associated with the keys, wherein said relative frequencies are determined with respect to the frequencies of occurrence of the characters in the objects in memory. Preferably, the auto-correcting keyboard region includes one or a plurality of keys associated with one or a plurality of punctuation characters, wherein said memory includes one or a plurality of objects in memory which include one or a plurality of the punctuation characters associated with keys in said auto-correcting keyboard region. Alternatively, the word evaluation component calculates the matching metric for each candidate object by summing the distance values calculated from determined location in the input sequence to the known location of the key corresponding to the character in the corresponding position of the candidate object, and applying a weighting function according to the frequency of use associated with the object. In another embodiment, at least one of the keys in the auto-correcting keyboard region corresponds to a plurality of characters, one or a plurality of which include various diacritic marks, wherein the plurality of characters comprise variant forms of a single base character, and wherein objects in memory are stored with their correct accented characters. Preferably, the selection component presents the identified one or a plurality of candidate objects for selection by the user in a candidate object list in the text display area. Most preferably, the selection component identifies the highest ranked candidate object and presents the identified object in the candidate object list in the position nearest to the auto-correcting keyboard reg on. Further, activation of a key that is associated with a character, wherein the key is not included within the auto- correcting keyboard region, accepts and outputs the determined highest ranked candidate object at a text insertion point in the text display area prior to outputting the selected character at the text insertion point in the text display area. Further, the user selection of an object for output at a text insertion point in the text display area terminates the current input sequence such that the next key activation event within the auto-correcting keyboard region starts a new input sequence. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1A is a schematic view of a preferred embodiment of a portable computer incorporating a reduced keyboard system of the present invention which automatically corrects input keystrokes; Figure 1B is the same schematic view showing an embodiment of a word choice list that is displayed after the user has entered a sequence of keystrokes within the auto-correcting keyboard region. Figure 2 is a hardware block diagram of the reduced keyboard system of Figures 1A and 1B. Figure 3 is a schematic view of a preferred embodiment of an auto-correcting keyboard region of the reduced keyboard system of the present invention which automatically corrects input keystrokes, showing its division into three clustering regions and three example contact points. Figures 4A through 4K show a flow chart of a preferred embodiment of software to determine the intended text to be generated in response to an input sequence of keystrokes. Figures 5A through 5E are schematic views showing a sequence of character inputs as an illustrative example of entering a word on a preferred embodiment of a portable computer incorporating a reduced keyboard system of the present invention. DETAILED DESCRIPTION OF THE INVENTION Since user keystroke entries are presumed to be possibly inaccurate, there is some ambiguity as to how a particular sequence of keystrokes should be interpreted in order to generate the sequence of characters that the user intended to type. The present invention provides a process and system (i.e., apparatus or device having the inventive software within) wherein the user is presented with one or more alternate interpretations of each keystroke sequence corresponding to a word such that the user can easily select the desired interpretation, and wherein no special action need be taken to select the interpretation deemed most likely. This approach enables the system to utilize the information contained in the entire sequence of keystrokes corresponding to a word in resolving what the user"s likely intention was for each character of the sequence. The method of the present invention has two very significant advantages over prior systems, such as that disclosed by U.S. Patent 5,748,512. One is that the inventive system is able to utilize information regarding both preceding and succeeding keystrokes in determining the intended character for each keystroke, together with the length of the word and a database that includes information as to the relative frequencies of potentially matching words. This is far more information than can be utilized by prior systems, and greatly increases the performance of the system. The second advantage is that the user need only interact and respond to predictions by the system at word boundaries, after all the characters of each word have been entered, rather than having to examine, and accept or reject each character generated by the system immediately following each keystroke. This greatly enhances the usability of the system, since the user is thus able to focus much more on the entry of text on the keyboard without needing to constantly divert his attention to the display following each keystroke. Another advantage is the system also accommodates punctuation characters such as a hyphen or apostrophe that are commonly embedded in words such as hyphenated compounds and contractions in English. Such embedded punctuation characters can be associated with one or more keys or character locations included among those associated with alphabetic characters. Definitions "Keyboard" shall mean include any input device having defined areas including, but not limited to, a touch sensitive screen having a defined area containing a plurality of defined locations associated with characters, a touch sensitive screen having defined areas for keys, discrete mechanical keys, or membrane keys. "Auto-correcting keyboard region" refers to that region of the keyboard having the inventive auto-correcting process and features applied. "Object" shall mean a string of one or more characters forming a word, wordstem, prefix or suffix. "Wordstem" shall mean a "root word." For example, the word "interestingly" consists of the root word "interest" to which the suffix "ingly" has been appended. "Module" is a logical organization of objects based upon characteristics of the objects. For example, (1) words of the French language versus words of the English language are arranged in different modules, (2) a verb stem module contains verb stems to each of which one or more possible suffixes may be appended, wherein the suffixes are contained in one or more suffix modules associated with the verb stem module, wherein the suffixes from the suffix modules can be appended to a verb stem in the verb stem module to form a properly inflected word. A "contact action" comprises the entirety of a user action which results in a contact with the keyboard, starting from the first point and moment of contact, and including any additional contiguous points of contact that are detected up to the moment at which contact with the keyboard is terminated. Examples of contact actions include, but are not limited to, physically touching a touch sensitive screen with a stylus or finger and moving the stylus or finger to a greater or lesser degree prior to lifting the stylus or finger from the screen, or moving a mouse cursor to position it within a displayed keyboard region and clicking the mouse button then moving the mouse cursor to a greater or lesser degree prior to releasing the mouse button. A "contact location" is the location determined to correspond to a user action which results in a contact with the keyboard. Methods of determining a contact location include, but are not limited to, detecting the point on a touch screen or similar device where the initial or final contact was made by the user, or detecting a user action such as a mouse click whereby the contact location is determined corresponding to the location of the mouse cursor within a displayed keyboard region at the time of that the mouse button is first depressed. A "distance value calculation component" calculates a set of distance values between a contact location and the known coordinate locations corresponding to one or more characters within the auto-correcting region of the keyboard. The method used to calculate the distance between two locations includes, but is not limited to, assigning Cartesian coordinates to each location and calculating the distance between two locations according to standard Cartesian coordinate distance analysis, assigning Cartesian coordinates to each location and calculating the distance between two locations as the square of the standard Cartesian coordinate distance, and assigning Cartesian coordinates to each location and calculating the distance between two locations according to Cartesian coordinate distance analysis where the vertical component is adjusted by a weighting factor. A "matching metric" is a score calculated for an object with respect to an input sequence of contact locations as a means to estimate how likely it is that the object corresponds to the user"s intention in performing the input sequence of contacts. For example, a matching metric can be calculated in one embodiment as the sum of the squares of the distances from each contact location in the entry sequence to the location assigned to the character in the corresponding position of a given candidate object, and then multiplying the sum of the squared distances by a frequency adjustment factor, which in one preferred embodiment is calculated as the base 2 logarithm of the ordinal position of the word with respect to other potential candidate objects, where objects associated with higher relative frequencies correspond to lower ordinal positions, i.e., the most frequent object is at position "1." Thus, in this embodiment, the lower the numeric value of the calculated matching metric, the more likely a given object is deemed to correspond to the user"s intention in generating a sequence of contact points. An "evaluated ranking" is the relative prioritization of a set of candidate objects according the likelihood that each of the objects corresponds to the user"s intention in generating a sequence of contact points, where this likelihood is determined according to the matching metric calculated for the objects. A "key activation event" includes but is not limited to an event that comprises the entirety of the activated keys detected during the course of a user action which results in the activation of one or more adjacent keys of a mechanical keyboard, starting from the first depressed key and including the time at which it was depressed, and including any additional keys that are adjacent to the first depressed key and that are simultaneously depressed, detected up to the moment at which neither the first key nor any simultaneously depressed adjacent key is depressed. With regard to Figure 1A, a reduced auto-correcting keyboard system 100 formed in accordance with the present invention is depicted incorporated in a palmtop portable computer 102. Portable computer 102 contains a reduced keyboard 105 implemented on a touch screen display 103, which is used to generate text to be output to text display region 104. For purposes of this application, the term "keyboard" is defined broadly to include any input device having defined areas including, but not limited to, a touch screen having defined areas for keys, discrete mechanical keys, or membrane keys. Keyboard 105 has an auto-correcting keyboard region 106 wherein the 26 letters of the English alphabet plus an apostrophe are displayed in approximately the standard "QWERTY" arrangement. In this preferred embodiment, it is relevant to note that the aspect ratio of the keyboard 106 (the ratio of its width to its height) is less than 2:1, whereas for a standard computer keyboard or typewriter, this ratio is approximately 4:1. This aspect ratio renders the keyboard 106 easier to use in that the less elongated shape tends to minimize the distance the stylus must be moved between letters at opposite ends of the keyboard, while enhancing the system"s ability to distinguish between letters in adjacent rows by increasing their relative separation. This makes it easier for the user to contact the keyboard in a location that is relatively close to the intended letter in the vertical dimension. Consequently, in a preferred embodiment, the distance of a contact point from a letter is calculated using a method that increases the relative weight of the vertical component of the distance with respect to the horizontal component. The keyboard may be of any size, very small or very large. For example, an implementation using a space for the auto-correcting keyboard as small as 1 cm by 0.5 cm that includes all 26 letters of the English alphabet has been found to be quite usable with a small plastic stylus. When embodied as a keyboard of this size, a well- known key arrangement such as the standard "QWERTY" layout may be used. With this key arrangement it is not necessary to include legible displayed characters, because the relative locations of each character in the defined keyboard space are well known to users familiar with such a standard layout. Alternatively, a very small label such as a dot may be displayed at each character location to aid the user. In accordance with another aspect of the invention, the internal, logical representation of the characters need not mirror the physical arrangement represented by the labels on the actual characters in the auto-correcting keyboard. For example, in a database constructed to represent a French vocabulary module, the accented characters A and A may also be associated with the unaccented character A that appears as an explicitly labeled key in a mechanical keyboard or character location in a keyboard implemented on a touch-sensitive display screen. The word entries in the French vocabulary module include the necessary information to determine whether a given word is spelled with an accented or unaccented character so that the correctly spelled form can be automatically generated based on an input contact point sufficiently near the key or character location associated with the unaccented character. This is a significant advantage for languages such as French that often use accented characters since no special typing techniques, additional keys, or additional keystrokes are required to type words using their correct spellings including appropriate accents. The preferred keyboard of Figure 1A contains six additional keys associated with the execution of specific functions or the generation of specific characters. These keys include a Shift key 108, a Space key 110, a Backspace key 112, an Edit Word key 114, a Symbols Mode key 116, a Return (or "Enter") key 118, an Alternate Keyboard Mode key 120, and a Numeric Mode key 122. The function of these keys will be discussed in conjunction with Figure 1B. Text is generated using the keyboard system via keystrokes on the auto-correcting keyboard 106. As a user enters a keystroke sequence using the keyboard, text is displayed on the computer display 103. Two overlapping regions are defined on the display each of which display information to the user. An upper output text region 104 displays the text entered by the user and serves as a buffer for text input and editing. A word choice list region 150, which in a preferred embodiment shown in Figure 1B is super-imposed on top of the text region 104, provides a list of words and other interpretations corresponding to the keystroke sequence entered by a user. The word choice list region 150 aids the user in correcting inaccuracies in the entered keystrokes. In another embodiment, the system may be implemented on a device with limited display space, and display only the Default or most likely word object at the insertion point 107 in the text being generated. In another preferred embodiment, the keyboard of the present invention is implemented using a keyboard device. Examples of such devices would include the standard desktop keyboard used with personal computers, or much smaller mechanical keyboards such as those commonly used in portable, hand-held electronic devices such as two-way pagers that, in the case of English and other Latin-alphabet based languages, include a full set of at least 26 small, closely spaced keys, often arranged in the standard "QWERTY" layout. This embodiment is logically identical to a touch screen implementation in which the points at which physical contact with the screen can be detected correspond exactly to the set of coordinates associated with the characters of the keyboard. Thus, the methods of the present invention may be applied equally well to such mechanical keyboard implementations. However, mechanical keyboards have a distinguishing characteristic from touch screens in that a single inaccurate or erroneous key activation may not only consist of activating a key other than the one intended, but also may consist of simultaneous or closely sequential activation of two or more adjacent keys, wherein the activated keys may or may not include among them the intended key. Thus, in accordance with another aspect of the invention, a sequence of keystrokes on the auto- correcting keyboard is filtered through a window of both time and space, in that a single intended keystroke may activate more than one adjacent key. An example is when a user depresses 2, 3 or 4 keys when the user"s finger is not properly aligned with the intended key or any single specific key. Thus, following each received keystroke, the keystroke is not processed until after the system waits for a very brief timeout threshold, or until a keystroke is received on a non-adjacent key. If the next keystroke occurs on an adjacent key, or if multiple keystrokes occur on adjacent keys, before the expiration of the timeout threshold, the detected keys are regarded as a single keystroke event. In such cases, a "virtual" point of contact is calculated at the center of the set of "simultaneously" activated keys. The distances from this calculated "virtual" contact point and the known character locations (key locations in this case of a mechanical keyboard) are calculated by interpolating to a logical coordinate frame with a finer resolution than that of the physical sensors (keys). In another embodiment of the invention, keystrokes on the auto-correcting keyboard are not matched to characters in isolation, but rather entire sequences of keystrokes corresponding to completed words are matched against a lexicon of candidate words that includes information regarding the relative frequency with which each word appears in a representative corpus of usage. In this way, the system is often able to correctly compensate for occasional keystroke errors of a larger than average magnitude, or even multiple errors of a relatively larger magnitude when the intended word is of high relative frequency. This word-level analysis of keystroke input sequences are a key factor in enabling the inventive system to flexibly accommodate user keystroke errors. The word-level analysis of keystroke sequences enables the system to generate punctuation characters such as a hyphen or apostrophe that are commonly embedded in words such as hyphenated compounds and contractions in English. Such embedded punctuation characters can be associated with one or more keys or character locations included in the auto-correcting keyboard among those associated with alphabetic characters. When more than one punctuation character is associated with a single key, the specific punctuation character intended can be disambiguated based on the information included in the lexicon. Thus, for example, if a word in the lexicon includes an apostrophe in a position corresponding to a key contact in the region of an ambiguous punctuation key, the matching algorithm will automatically identify the associated word and disambiguate the keystroke as an apostrophe. Simultaneously, the system can separately analyze the keystroke sequences preceding and following the key contact in the region of the punctuation key to determine the most likely matching words in the lexicon and calculate the likelihood that a hyphenated compound was intended. In the case of a keyboard implemented on a touch-sensitive display screen, other symbols, numbers or other characters not commonly used are relegated to a separate symbol selection scheme, preferably through presentation in a series of temporarily displayed tables. Such Symbol Tables are preferably accessed through a function key or touch entry element assigned adjacent to the auto-correcting keyboard region. In the case of a mechanical keyboard, these other symbols, numbers and uncommon characters are often accommodated through additional keys not included in the auto-cbrrecting keyboard. In accordance with another aspect of the invention, candidate words that match the input sequence are presented to the user in a word selection list on the display as each input is received. In accordance with another aspect of the invention, the word interpretations are presented in the order determined by the matching metric calculated for each candidate word, such that the words deemed to be most likely according to the matching metric appear first in the list. Selecting one of the proposed interpretations of the input sequence terminates an input sequence, so that the next keystroke inside the auto-correcting keyboard region starts a new input sequence. In accordance with yet another aspect of the invention, only a single word interpretation appears on the display, preferably at the insertion point for the text being generated. The word interpretation displayed is that deemed to be most likely according to the matching metric. By repeatedly activating a specially designated selection input, the user may replace the displayed word with alternate interpretations presented in the order determined by the matching metric. An input sequence is also terminated following one or more activations of the designated selection input (effectively selecting exactly one of the proposed interpretations of the sequence for actual output by the system), so that the next keystroke inside the auto-correcting keyboard region starts a new input sequence. In accordance with another aspect of the invention, for each input sequence of contact points, a word is constructed by identifying the character nearest each contact point and composing a word consisting of the sequence of identified characters. This "Exact Type" word is then presented as a word choice in the word selection list. This word may then be selected in the usual manner by, for example, touching it in the word selection list. Exact Type entries can be edited by, for example, pressing a backspace key to delete one character at a time from the end of the word. Once the user selects the Exact Type word, it is automatically "accepted" for output and is added to the information being composed. When so selected, the Exact Type string may be added as a candidate for inclusion into the lexicon of words so that in the future it can be typed using the auto-correcting keyboard without needing to precisely contact each letter of the word as is necessary in first entering an Exact Type entry. Figure 1B shows a preferred embodiment of a word choice list 150 that is displayed after the user has entered a sequence of keystrokes within the auto-correcting keyboard region 106. The word choice list includes a Cancel key 152, wherein contacting the Cancel key causes the system to discard the current input sequence, clearing the word choice list and causing the system to restore the display of any text or graphics obscured by the appearance of the word choice list. The "Exact Type" word 154 shows the sequence of letters closest to the actual contact points of the input sequence, whether or not these correspond to any word in any vocabulary module. In the example shown in Figure 1B, the Exact Type word "rwzt" does not correspond to an English word. In a preferred embodiment, selecting the Exact Type word for output results in the automatic addition of that word to the appropriate vocabulary module if it is not already included. The Default word 160 ("text" in the example of Figure 1B) is the word from the vocabulary modules determined to have the lowest value of the matching metric (that is, the more likely the word corresponds to the user"s intention), and in a preferred embodiment, is shown at the bottom of the word choice list, nearest to the auto-correcting keyboard region 106. Similarly, three alternate word choices 157 are shown in the list in an order determined by their corresponding matching metric values. The Symbols Mode key 116, the Alternate Letter Mode key 120, and the Numeric Mode key 122 each cause a corresponding keyboard of punctuation and symbols, alphabetic letters, and numeric digits, respectively, to appear on the display screen. The user can then select the desired character or characters from the displayed keyboard. If a word choice list was displayed prior to displaying such an alternate keyboard, the selection of any character from the displayed alternate keyboard causes the Default word of the previously displayed word choice list to be output to the output text region 104 prior to outputting the selected character from the alternate keyboard. Similarly, if a word choice list was displayed prior to contacting the Space key 110 or the Return key 118, the Default word 160 is flushed to the output text region 104 prior to generating a single space or carriage return character, respectively. In the preferred embodiment, the Shift key 108 functions as a latching Shift key, such that contacting it causes the letter associated with the next contact in the auto- correcting keyboard 106 to be generated as an upper-case letter. In another preferred embodiment, two successive contacts on the Shift key 108 puts the system in "Caps-Lock," and a subsequent activation cancels "Caps-Lock" mode. Backspace key 112 deletes the last input contact from the current sequence of contacts if one exists, and otherwise deletes the character to the left of the cursor at the insertion point 107 in the output text region 104. When no current input sequence exists, a contact on the Edit Word key 114 causes the system to establish a current input sequence consisting of the coordinate locations associated with the letters of the word that contains the insertion point cursor 107 or is immediately to the left of this cursor in the output text region 104. The result is that this word is "pulled in" to the system creating a word choice list in which the word appears both as the Default word 160 and the Exact Type word 154. A block diagram of the reduced keyboard disambiguating system hardware is provided in Figure 2. The touch screen 202 and the display 203 are coupled to a processor 201 through appropriate interfacing circuitry. Optionally, a speaker 204 is also coupled to the processor. The processor 201 receives input from the touch screen, and manages all output to the display and speaker. Processor 201 is coupled to a memory 210. The memory includes a combination of temporary storage media, such as random access memory (RAM), and permanent storage media, such as read-only memory (ROM), floppy disks, hard disks, or CD-ROMs. Memory 210 contains all software routines to govern system operation. Preferably, the memory contains an operating system 211, auto-correction software 212, and associated vocabulary modules 213 that are discussed in additional detail below. Optionally, the memory may contain one or more application programs 214, 215, 216. Examples of application programs include word processors, software dictionaries, and foreign language translators. Speech synthesis software may also be provided as an application program, allowing the reduced auto-correcting keyboard system to function as a communication aid. In accordance with another aspect of the invention, each input sequence is processed with reference to one or more vocabulary modules, each of which contains one or more words together with information about each word including the number of characters in the word and the relative frequency of occurrence of the word with respect to other words of the same length. Alternatively, information regarding the vocabulary module or modules of which a given word is a member is stored with each word. Each input sequence is processed by summing the distances calculated from each contact point in the entry sequence to the location assigned to the letter in the corresponding position of each candidate word, wherein the distances are calculated according to one of the preferred methods. This total distance is combined with the frequency information regarding each candidate word to calculate a matching metric by which the various candidate words are rank ordered for presentation to the user. In one preferred embodiment, the matching metric is calculated as follows. The square of the distance from each contact point in the entry sequence to the location assigned to the letter in the corresponding position of each candidate word is calculated, and the sum of the squared distances is calculated for each candidate word. This sum is then multiplied by a frequency adjustment factor, which in one preferred embodiment is calculated as the base 2 logarithm of the ordinal position of the word in the candidate list, where words of higher relative frequency are moved "higher" in the list to positions corresponding to a lower ordinal position (i.e., the most frequent word is at position "1"). Thus, the lower the numeric value of the calculated matching metric, the more likely a given word is deemed to correspond to the user"s intention in generating a sequence of contact points. In another aspect of the invention, prior to multiplying the sum of the distances (from each contact point in the entry sequence to each corresponding letter in a candidate word) by the frequency adjustment factor, a fixed increment is added to the sum so that it is at least greater than or equal to this increment value. This is done to avoid calculating a matching metric value of zero (i.e., the most likely match) when the sequence of contact points happens to correspond exactly to the spelling of a given word, even when that word occurs with very low frequency (i.e., has a high numeric ordinal position). This allows much more frequently occurring words to produce a better matching metric even when an inaccurate sequence of contact points is entered. In one implementation of this preferred embodiment, it was found that a fixed increment value of approximately twice the average distance between adjacent characters in the keyboard was effective in reducing spurious matches with infrequent words. In accordance with another aspect of the invention, words in each vocabulary module are stored such that words are grouped into clusters or files consisting of words of the same length. Each input sequence is first processed by searching for the group of words of the same length as the number of inputs in the input sequence, and identifying those candidate words with the best matching metric scores. In accordance with another aspect of the invention, if fewer than a threshold number of candidate words are identified which have the same length as the input sequence, and which have a matching metric score better than a threshold value, then the system proceeds to compare the input sequence of N inputs to the first N letters of each word in the group of words of length N+1. This process continues, searching groups of progressively longer words and comparing the input sequence of N inputs to the first N letters of each word in each group until the threshold number of candidate words are identified. Viable candidate words of a length longer than the input sequence may thus be offered to the user as possible interpretations of the input sequence, providing a form of word completion. In another aspect of the invention, prior to multiplying the sum of the distances (from each contact point in the entry sequence to each corresponding initial letter in a candidate word whose length is greater than the length of the current input sequence) by the frequency adjustment factor, a second fixed increment is added to the sum so that it is greater than the distance sum that would be calculated for a word whose length corresponds exactly to the length of the current input sequence. This is done to assign a relatively higher matching probability to words whose length does correspond exactly. In another preferred embodiment, this second increment factor is a function of the difference in length between the candidate word and the current input sequence. In accordance with another aspect of the invention, in order to increase the efficiency with which the vocabulary modules can be processed, each character mapped onto the touch-sensitive pad in the auto-correcting keyboard region is assigned a boundary of exclusion. Each such boundary identifies the region beyond which the distance from the contact point to the character will not be calculated and the character will be removed from consideration for that contact point in the input sequence, reducing the computation required by the distance calculation process. The boundaries of exclusion for several characters may share some or all common boundary segments. Examples of shared boundaries include the extreme edge of the auto-correcting keyboard region, or gross boundaries drawn through the character space to subdivide the auto-correcting keyboard into 2, 3 or more major clustering regions. Conceptually, it is identical to consider the boundary of exclusion for a given contact point, where any character outside that boundary is excluded from consideration as a match for that input point. For example, Figure 3 shows an auto-correcting keyboard region 300 that consists of a horizontal rectangle which is divided vertically into three clustering regions 301, 302, 303 of approximately equal size, where these regions are defined such that each character falls into only one of the three clustering regions. The clustering regions are defined such that for each contact point in the auto-correcting keyboard region, at least one and frequently two of the three regions lie completely outside the boundary of exclusion for that contact point. For example, a contact point 311 at the left side of region 301 is far enough away from region 302 that all characters in region 302 (and region 303) could be defined to lie outside the boundary of exclusion for contact point 311. In contrast, the boundary of exclusion for contact point 312 at the right side of region 301 would extend into region 302 such that one or more characters in region 302 would be considered to lie inside the boundary, so that the only region completely outside the boundary of exclusion for contact point 312 would be region 303. The boundary of exclusion for contact point 313 in the center of region 302 could be considered to be far enough away from both region 301 and region 303 that all characters in both these regions could be defined to lie outside the boundary. Such clustering regions are then used to increase the efficiency with which the system can identify the most likely matching words in one or more vocabulary modules for a given input sequence of contact points. Continuing the example described above and depicted in Figure 3, the words of a given length in each vocabulary module can be divided up into nine different sub-groups based on the clustering regions in which each of the first two letters of each word is found, since there are nine possible ordered pairs of such regions. Note that processing words of only one letter need not be optimized since very little calculation is required and there are only a very small number of one-letter words, even when every letter is treated as if it is a one-letter "word." For each of the first two contact points, letters in one or two of the clustering regions can be eliminated from consideration, so that all of the words in the sub-groups associated with letters in the eliminated regions can be skipped over without needing to perform any distance calculations. Thus, assuming a more or less equal distribution of total character frequency among the three regions for the first two character positions of words in the vocabulary modules, upon the receipt of the second contact point, the system need only calculate distances for and compare at most 4/9 of the candidate words (when only one clustering region is eliminated from consideration for each contact point) to as few as 1/9 of the candidate words (when two clustering regions are eliminated for each contact point). As would be obvious to one of ordinary skill in the art, this method can be used with a greater or lesser number of clustering regions, and for different numbers of initial contact points, with corresponding results. For example, four clustering regions could be used to divide candidate words into sixteen sub-groups based on the first two contact points. In another embodiment of the invention, a subset of characters or functions will be associated with uniquely defined regions or keys outside the auto-correcting keyboard, where entries within these regions are interpreted as explicit entries of a specific character or function, for example, a Space key that unambiguously generates a single space when selected. For a defined set of such keys, selecting such a key immediately following an input sequence, and prior to performing an explicit selection of any of the interpretations offered by the system for the input sequence, results in the automatic acceptance of the interpretation of the input sequence deemed to be most likely according to the matching metric calculated for each candidate word. The input sequence is terminated, so that the next keystroke inside the auto-correcting keyboard region starts a new input sequence. Once the desired word interpretation of an input sequence has been determined and the sequence is terminated, the system automatically outputs the word so that it is added to the information being constructed. In the case of certain functions, for example the backspace function, an entry within the associated region is interpreted as an explicit entry of the backspace function, which is immediately executed. The result in this case however, does not terminate the input sequence, but simply deletes the last (most recent) input from the sequence. In general, keys outside the auto-correcting keyboard are immediately interpreted and acted upon according to the unique character or function associated with the key. Depending on the associated character or function, in some cases the current input sequence is terminated as a result. In accordance with another aspect of the invention, the system distinguishes between two different types of contact events that occur in the area of the touch screen or touch-sensitive display that is used to display the auto-correcting keyboard region and other uniquely defined regions or keys outside the auto-correcting keyboard. One type of contact consists of a "tap" event, wherein the touch screen is contacted and then the contact is terminated without moving beyond a limited distance from the initial point of contact. This type of event is processed as a keystroke intended for the reduced auto-correcting keyboard system as described in this disclosure. The second type of contact consists of a "stroke" event, wherein the touch screen is contacted then the point of contact is moved in one or more directions beyond the limited distance threshold used to define a tap event. This second type of contact can then be processed by using a stroke recognition system using techniques that are well known in the art. This allows a number of additional functions or special characters to be made easily accessible to the user without having to trigger pull-down menus or define additional keys that would either require additional screen space or reduce the size of the keys provided. The interpretation of such strokes and the resulting character or function associated with a recognized stroke is then processed by the system in the same fashion as an activation of one of the uniquely defined regions or keys outside the auto-correcting keyboard. In this way, only a limited area of the available touch screen or touch-sensitive display needs to be used to accommodate both keyboard-based and stroke recognition input approaches. In accordance with another aspect of the invention, the system performs additional processing of "tap" events to dynamically adjust to a particular user"s style of contacting the touch screen or touch-sensitive display. For a user who contacts the display with a stylus "gesture" that closely approximates a point (i.e., the stylus contacts the display and is lifted before being moved any appreciable distance), there is no significant ambiguity as to where the user intended to contact the keyboard. However, when the stylus moves to a greater or lesser extent before being lifted from the display, there is ambiguity as to which point contacted during the duration of the stylus "gesture" best represents the point that the user intended to contact - the initial point of contact, the final point where the stylus was lifted, or some other point along the path of contact of the stylus. In a preferred embodiment, the system records the path traced out by each contact as a set of N contact points that include the endpoints of the path of contact and zero or more points equally spaced points along the path. For example, in an embodiment where N is set to 3, the set would include the endpoints and the midpoint of the path. Initially, one point of each set of recorded points is designated as the coordinate to be used to represent the point of contact in calculating distances to letters in the auto-correcting keyboard. For example, in a preferred embodiment, the initial point of contact recorded in each set is designated as the coordinate to be used to represent the point of contact in all distance calculations. Each time a word is selected for output from the word choice list, the distance calculation is repeated from each letter in the chosen word to each of the other sets of recorded points. For example, when N is set to 3 and the calculation is performed for the starting point of contact, the calculation is repeated for the set of midpoints and for the set of endpoints. Whichever set of points results in the minimum calculated distance is then designated as the set of points whose coordinates are to be used to represent the sequence points of contact in all subsequent distance calculations in creating the word choice list for each sequence of contacts. In another preferred embodiment, a running average is computed of the distance calculations performed for each point set, and the point set for which this running average is lowest is used for distance calculations in creating the word choice list. In another preferred embodiment, the running average is computed of the horizontal and vertical signed offset of the designated points from the intended target letters, and the coordinates used in distance calculations for creating the word choice list are adjusted by this average signed offset, or by a fixed fraction of this offset. Thus, if a user consistently contacts the touchscreen somewhat to the left and below the intended letters, the system can automatically adjust and more accurately predict the intended word on average. In accordance with another aspect of the invention, each character mapped onto the touch-sensitive pad in the auto-correcting keyboard region is assigned a region of territory. Each such region identifies an area wherein the distance from the user entry to the character is assigned the value of zero, simplifying the distance calculation process. The size of such regions can vary for different characters and functions. For example, a larger region may be assigned to a character that occurs with a relatively higher frequency within a representative corpus of usage. In one embodiment, this region assigned to a character simply corresponds to a defined key that is clearly circumscribed and demarcated on the touch screen, and to which the character is assigned. The operation of the reduced auto-correcting keyboard system is governed by the auto-correction software 212 which is based in part on the distance between the contact point and the various candidate characters. In one embodiment of the invention, each character in the auto-correcting keyboard is assigned a Cartesian coordinate to simplify the calculation of the distance to keystrokes. The distance between the contacted point and the various candidate character locations in the auto-correcting keyboard, therefore, is calculated through simple Cartesian coordinate distance analysis. In another embodiment of the invention, the square of the simple Cartesian coordinate distance is used to both simplify calculation (because no square root need be calculated) and to apply a non-linear weighting to more distant contact points. In other embodiments, the distance calculation also utilizes other nonlinear functions such as natural logarithms or discrete steps, either exclusively or in an appropriately weighted combination with Cartesian coordinate distance analysis. Also, in another preferred embodiment the distances in the x and y directions are weighted differently. Such modifications to the distance calculation can serve to simplify word selection, reduce processing requirements, or to accommodate systematic entry anomalies depending on the particular needs of a given system and its implementation. For example, in the case of a touch screen display panel on which a QWERTY keyboard arrangement is displayed with three rows of character keys, it is generally less likely that a significant error will be made in contacting the keyboard in the wrong row. In this case, vertical distance along the y-axis may be weighted more heavily than horizontal distance along the x-axis. Additionally, the spacing between characters on the auto-correcting keyboard may be non-uniform, depending on how frequently any given character is used in a representative corpus of the language, or on its location relative to the center or the edge of the keyboard. Alternatively, when sufficient computational resources are available, one or more characters may be assigned a plurality of corresponding coordinate locations to be used as reference points in calculating the distance of the key from the coordinate location of a point at which the keyboard was contacted, wherein that distance is calculated as the distance from the contacted point to the closest such assigned reference coordinate. This will tend to decrease the calculated distances to points at which the display is contacted in a non-linear fashion, and consequently increase the size of the region surrounding the character in which there is a high likelihood that a sequence of contacts that includes a contact point in the region will match a word with the character in the corresponding position. Also, the coordinates of the characters may be assigned to locations not shared by keyboard keys or directly detectable by sensors. This allows the system to be implemented using less costly touch screens or keyboards having a lower resolution in detecting points of contact. It also allows the keyboard to be reconfigured according to the user"s wishes but still utilizing the same physical keyboard touch screen or sensor array. For example, the common three rows of characters in the QWERTY layout may be served with 1, 2, 3 or more rows of sensors to reduce the keyboard"s mechanical complexity or to allow dynamic reassignment of novel keyboard arrays. An example would be changing from 3 rows of 9 characters to 4 rows of 7 characters. The assigned coordinate location for a given character key may thus lie between the nearest two or more points at which physical contacts with the keyboard may be detected and resolved. In this case, the distance from a detectable contact point and the assigned character location is calculated by interpolating to a logical coordinate frame with a finer resolution than that of the physical sensors. In one preferred embodiment of the system, additional processing optimization is achieved by setting a limit on how many letters in a given candidate word can be further away from the corresponding input contact point than a preset threshold distance (maximum_key_distance). If this preset threshold maximum_key_distance is set to a value other than MAX_DISTANCE_VALUE (the maximum distance value that can be calculated by the distance measurement algorithm used in the system), then a second threshold over max_distance_limit is set to the maximum number of letters in a given candidate word that can be further than maximum_key_distance from the corresponding input contact point. FIGURES 4A through 4K show a flow chart of a preferred embodiment of a main routine of the auto-correction software 212 that generates and manages a word choice list to aid the user in efficiently utilizing inaccurate keystroke sequences. Figure 4A, shows the main processing routine, which when the system is first started, at block 4105 initializes both the word choice list and the current input sequence to an empty state. Then, at block 4110, the system waits to receive a keystroke from the touch screen 202. Upon receipt of a keystroke, at block 4115 the system determines whether the coordinates x/y of the received keystroke contact point lie within the boundaries of the auto-correcting keyboard region 106. If not, then the process indicated in block 4120 is carried out as shown in the flowchart of Figure 41, wherein the system processes the specific character or function associated with the defined key region containing contact point x/y. If at block 4115 the received keystroke contact point x/y lies within the boundaries of the auto- correcting keyboard region 106, then at block 4130 the length k of the sequence is incremented by one, and the point x/y is appended to the end of the current input sequence as the Kth input. Then at block 4140, the system sets the key distance table entries KDik to the squares of the Cartesian distances from the Kth input point x/y to the nearest point on the perimeter of each key Ki in auto-correcting keyboard, setting KDik to 0 when x/y is in the interior of key region Ki. At block 4150, for each possible character Cj that is a valid character appearing in one or more words of the vocabulary modules 213, a translate table character_map mapping each character value Cj to its corresponding key Ki is used to set each element CDjk of the Kth row of the character_distance table to the squared distance KDjk from Kth input x/y to the key Ki corresponding to each possible character Cj. This allows the distances used in calculating the matching metric to be calculated only once (when KDjk is set in the key_distance table), and the translate table character_map is likewise used only once when the character_distance table is filled in from the key_distance table. This allows for greater efficiency in the large number of calculations that would otherwise be repeated in processing the words of the vocabulary modules. At decision block 4160, the variable maximum_key_distance is checked to determine whether it is set to a value other than MAX_DISTANCE_VALUE, and if so, at block 4170, an auxiliary index array is sorted so that, in searching the words of the vocabulary modules, the x/y inputs can be processed in ascending order of the likelihood of matching a character mapped to a key close to the x/y input. Sorting the inputs x/y to be processed in this order tends to minimize the total amount of computation required to process the vocabulary modules for the input sequence, since this increases the likelihood across all words that one or more x/y inputs will be greater than maximum_key_distance from the corresponding key before all inputs have been processed, so that the remaining inputs need not be processed since the word will be disqualified as a candidate as soon as the number of such inputs exceeds over_max_distancejimit. Figure 4K shows a preferred embodiment of how the likelihood of matching a character mapped to a key close to a given x/y input is calculated. A table character_frequencies is included with the vocabulary modules wherein element character_frequencies,j contains the sum of the relative frequencies of all characters found as the jth character of any word in the vocabulary, and which are mapped in character_map to key Kj. At block 41110, match probabilityk for the current input x/y is initialized to zero. In loop 41120, at decision block 41130, if key Ki is no greater than maximum_key_distance from the input x/y, then at block 41140 then match_probabilityk is incremented by the value of character_frequenciesjj divided by the distance (KDik + 1), where the distance KDjk is incremented by 1 to avoid division by zero and to scale each character_frequenciesjj appropriately. When all keys have been processed in loop 41120, then at block 41150, the index values Ik in array keyjndex are sorted in ascending order according to the values of match probabilityk that have been calculated for each input. Returning to Figure 4A, at block 4180, a new word choice list is computed based on the current input sequence of length k. Figure 4B shows a preferred embodiment for computing a new word choice list. At block 4210, any previously computed word choice list is cleared. At block 4220, if current input sequence includes two or more inputs, the software determines which of the three clustering regions can be excluded from consideration based on the coordinate locations of the first two inputs of the sequence. At block 4230, based on the excluded clustering regions, of the nine possible sub-groups of each word list in the vocabulary modules, the sub- groups of words which actually need to be processed are identified. Then, in block 4240, only these identified sub-groups are processed in order to identify candidate words to show in the word choice list. Figure 4C shows how the words in the identified sub-groups are processed to build a word choice list of the words that are most likely to match the user"s intention in entering an input sequence of keystrokes consisting of contact points inside the auto-correcting keyboard region. Block 4305 defines the limits of the loop from block 4310 through the test at block 4380 for loop termination. Block 4380 tests whether there are any more words of length k, the current length of the input sequence, that belong to one of the identified sub-groups, that have not yet been processed. If not, then at block 4385 the system tests whether the word list has been filled, and whether the value of the matching metric calculated for each word in the list is less than a predetermined threshold. If so, then the word list is deemed to have been filled with potential matches of an appropriate quality, and at block 4395 the processor returns to block 4260 in Figure 4B. If not, then at block 4390, the system tests whether there are any more words of any length greater than k, that belong to one of the identified sub-groups, that have not yet been processed. If not, then at block 4395 the processor returns to block 4260. Once the next word to be processed has been obtained from a vocabulary module at block 4310, at block 4315 word_distance is set to zero so that the weighted distance from the input sequence to this word can be summed into this variable. Then at block 4320, over max_distance_count is set to zero so that the number of letters in the word that are further from the corresponding contact point in the input sequence than a preset maximum threshold maximum_key_distance to this word can be counted with this variable. Then at block 4330, the word is processed as shown in Figure 4D. Block 4410 initializes the loop counter / to 1 and defines the limits of the loop from block 4420 through the test at block 4490 for loop termination when each of the k inputs in the current sequence have been processed. At block 4420, the variable next_key is set to the next index array value key_indexu which was sorted according to Figure 4J so that inputs are processed starting with those for which the calculated keyjdistance is most likely to exceed the threshold maximum_key_distance. The loop counter / is then incremented. At block 4430, keyjdistance is set to the corresponding value already calculated and stored as described above in the array CD, which contains the distance from each contact point in the input sequence to each possible character that occurs in any word of the vocabulary modules. At decision block 4440, if key_distance exceeds the threshold maximum_key_distance, then at block 4450 over_max_distance_count is incremented and at decision block 4455 over_max_distance_count is tested to determine if the maximum number over_max_distance_limit of such inputs has been exceeded. If so, loop 4410 is terminated early and the incorrect word distance, which is then returned at block 4490, is of no consequence since this word is disqualified from further consideration. If at decision block 4440, keyjdistance does not exceed the threshold maximum_key_distance, or if at decision block 4455, over_max_distance_count does not exceed the threshold over_max_distance_limit, then at block 4460 keyjdistance is summed into the total word_distance being calculated for the current word. This process is repeated for each contact point in the input sequence until at decision block 4470 it is determined that all inputs have been processed. When this process returns from block 4490, either wordjdistance has been correctly calculated for the current word, or over_max_distance_count exceeds the threshold over_max_distance_limit, and the current word is disqualified from further consideration. Returning to Figure 4C at decision block 4335, over_max_distance_count is tested to determine whether the current word is disqualified, and if so, execution proceeds to block 4380 to test whether the word processing loop 4305 should terminate. If not, at decision block 4340, if the length of the current word is greater than the number of inputs, then at block 4345 the calculated word_distance is incremented by a fixed amount wrong_length_additive_factor.. In another preferred embodiment, wrong_length_additive_factor is calculated as a function of the difference between the number of letters in the word and the number of contact points in the input sequence. In either case, processing returns to block 4350 where wordjdistance is incremented by a fixed amount all_word_additive_factor, to prevent any word from having a wordjdistance value of zero, so that the match_metric calculated for the word reflects its relative priority in the vocabulary module"s list. At block 4355, a multiplicative factor idx_multiplier is calculated to use as a weighting factor in combination with the calculated wordjdistance to determine the value of matchjmetric for the word. In the preferred embodiment shown in Figure 4C, idxjmultiplier is calculated as the bit position of the highest bit set to 1 in a binary representation of the numeric index of the word"s ordinal position in the list of which it is a member. This value ranges from 0 to 31, where 0 corresponds to the highest bit position, and 31 the lowest. In block 4360, this value is incremented by 1 so the multiplicative factor used is greater than or equal to 1 so that any non-zero wordjdistance will result in a non-zero matchjmetric value. If at decision block 4370 the matchjmetric is less than the worst (i.e. highest) matchjmetric score within the word choice list then the current word is inserted into the word choice list. If the matchjmetric is greater than or equal to the worst matchjmetric score within a full word choice list, than the current word is ignored. Decision block 4380 returns to block 4310 if there are any words left that have not been processed that are the same length k as the current input sequence. When decision block 4380 finds no more words to of length k to process, decision block 4385 tests whether the word choice list contains a full complement of matching words (in one preferred embodiment, a full complement consists of four words), each of which has a matchjmetric value below a predetermined threshold. If at decision block 4385 it is found that that the word list does not yet contain a full complement of matching words, then at block 4390 the system determines whether there are any words left of length greater than the current input sequence length k, and if so, execution continues from block 4310. Word testing continues until decision block 4385 finds that the word choice list is filled with matching words, or until decision block 4390 finds there are no additional words to test. Returning to Figure 4B, the word choice list is processed at block 4260. Figure 4E shows a preferred embodiment for processing the word choice list. At block 4510, the words selected for the word choice list are sorted in ascending order by word length, so that words whose lengths are equal to the number of keys for the entry string will be presented as the most likely alternatives within the word choice list. At block 4520, each group of words of the same length is sorted in ascending order according the values of match_metric that have been calculated for each word, so that words with lower values of match_metric are presented as the most likely alternatives. Words may be included in the vocabulary modules that are marked as known misspellings, for example, words in English in which the correct order of the letters "i" and "e" is commonly reversed. In one preferred embodiment, when such misspelled words are identified as candidate words from the vocabulary modules and are included in the word choice list, they are flagged such that they can be replaced in the word list at block 4540 with the corresponding correctly spelled words. Similarly, words may also be included in the vocabulary modules that are flagged as macros or abbreviations that are associated with other strings of text to be output and/or designated functions to be executed upon selection of the associated word. Such macros are also replaced in the word choice with the corresponding associated text strings at block 4540. Block 4560 applies the proper shift states to all characters of words within the word choice list, transforming the relevant characters into their proper form of upper case or lower case, according to the shift state that was in effect at the time the keystroke corresponding to each letter was performed. At block 4580 duplicate words in the word choice list are eliminated by removing the lowest priority duplicates. In accordance with another aspect of the invention, a software application implementing the input method of the present invention is installed in an existing device. During the installation of this application in the device, existing information files are scanned for words to be added to the lexicon. Methods for scanning such information files are well known in the art. As new words are found during scanning, they are added to the lexicon structure as low frequency words, and as such are placed at the end of the word lists with which the words are associated. Depending on the number of times that a given new word is detected during the scanning, it is assigned a relatively higher and higher priority, by promoting it within its associated list, increasing the likelihood of the word appearing in the word selection list during information entry. In accordance with another aspect of the invention, the lexicon of words has an appendix of offensive words, paired with similar words of an acceptable nature, such that entering the offensive word, even through Exact Typing of the locations of the letters comprising the offensive word, yields only the associated acceptable word in the Exact Type field, and if appropriate as a suggestion in the Word Selection List. This feature can filter out the appearance of offensive words which might appear unintentionally in the selection list once the user learns that it is possible to type more quickly when less attention is given to contacting the keyboard at the precise location of the intended letters. Thus, using techniques that are well known in the art, prior to displaying the Exact Type word string, the software routine responsible for displaying the word choice list simply compares the current Exact Type string with the appendix of offensive words, and if a match is found, replaces the display string with the associated acceptable word. Otherwise, even when an offensive word is treated as a very low frequency word, it would still appear as the Exact Type word when each of the letters of the word is directly contacted. Although this is analogous to accidentally typing an offensive word on a standard keyboard, the system of the present invention is designed to allow and even encourage the user to type with less accuracy. This feature can be enabled or disabled by the user, for example, through a system menu selection. Those skilled in the art will also recognize that additional vocabulary modules can be enabled within the computer, for example vocabulary modules containing legal terms, medical terms, and foreign language terms. Via a system menu, the user can configure the system so that the additional vocabulary words can be caused to appear first or last in the list of possible words, with special coloration or highlighting. Consequently, within the scope of the appended claims, it will be appreciated that the invention can be practiced otherwise than as specifically described herein. Returning through Figure 4B to Figure 4A, the word selection list is presented to the user and the main routine awaits the next keystroke from the touch screen 202 at block 4110. If, upon receipt of a keystroke, at block 4115 the system determines that the received keystroke contact point lies outside of the boundaries of the auto- correcting keyboard region 106, then the process of block 4120 is carried out as shown in Figure 41. Block 4910 identifies the character or function associated with the defined region. If at decision block 4920 the word choice list is empty, then block 4925 generates the character(s) associated with the defined key region, or executes the function associated with the defined key region, and at block 4970 the system returns to Figure 4A. If one or more words are currently displayed in the word choice list, decision block 4930 determines if the keystroke x/y coordinate falls within the word-choice list region 150. If so, at block 4935 the system processes the word selection from the word-choice list. In accordance with another aspect of the invention, the user presses a Space key to delimit an entered keystroke sequence. After receiving the Space key, the disambiguating system selects the most frequently used word and adds the word to the information being constructed. The Space key is used to delimit an entered sequence. In accordance with another aspect of the invention, the word selection list is presented as a vertical list of candidate words, with one word presented in each row, and wherein each row is further subdivided into regions or columns. The regions or columns define functions related to the acceptance of the candidate string displayed in the selected row, such as including or not including a trailing blank space, appending a punctuation mark or applying a diacritic accent. The function may be applied when the user touches the row of the intended string in the word selection list at a point contained in the region or column associated with the desired function. When the user selects the desired candidate word by contacting the row within certain regions or columns, the word is automatically "accepted" for output and is added to the information being composed. For example, contacting a row within the region associated with appending a trailing space immediately outputs the associated word with a trailing space. In accordance with another aspect of the invention, one such region or column is defined such that contacting a row within the region invokes a function which replaces the current input sequence of actual contact points with a sequence of contact points corresponding to the coordinate locations of the letters comprising the word in the selected row, but without terminating the current input sequence. As a result, the selected word appears in the selection list as the Exact Type interpretation of the input sequence. In most cases, the selected word also appears as the most likely word interpretation of the input sequence, although if the letters of the word are each near those of a much more frequent word, the more frequent word will still appear as the most likely word interpretation. This ability to re-define the input sequence as the coordinate locations of the letters of the intended word without terminating the input sequence enables the user to then continue typing, for example, a desired inflection or suffix to append to the word. When the intended word is relatively infrequent, and especially when it is seen only infrequently with the desired inflection or suffix, this feature makes it easier for the user to type the desired infrequently occurring form of the infrequent word without needing to carefully type each letter of the word. Only one additional selection step is required when the uninflected form of the word is selected by contacting the associated row in the selection list in the region associated with this feature. Figure 4J shows a preferred embodiment for processing word-choice list selections, registering contacts within regions 154, 157, or 160. Block 41010 identifies which row of the word-choice list was contacted and the associated word. Block 41020 identifies the word-choice list column that was contacted and the associated function Fcoi for that column. In the preferred embodiment shown in Figure 1B, three different columns are defined: one to the left of column marker 170, one to the right of column marker 172, and one between the column markers 170 and 172. Decision block 41030 determines if the function Fcol consists of replacing the input sequence with a new set of x/y locations of the word selected, which in the preferred embodiment shown in Figure 1B, corresponds to an x/y location to the right of column marker 172. If so, block 41032 replaces the input sequence with the sequence of x/y locations corresponding to the characters of the selected word and at block 41034 a new word choice list is generated as shown in Figure 4B. If function Fcol does not replace the input sequence, processing of the selected word from the word choice list continues. Block 41040 adjusts the selected word"s priorities. In accordance with another aspect of the invention, during use of the system by a user, the lexicon is automatically modified by a "Promotion Algorithm" which, each time a word is selected by the user, acts to "promote" that word within the lexicon by incrementally increasing the relative frequency associated with that word. In one preferred embodiment, the Promotion Algorithm increases the value of the frequency associated with the word selected by a relatively large increment, while decreasing the frequency value of those words passed over by a very small decrement. For a lexicon in which relative frequency information is indicated by the sequential order in which words appear in a list, promotions are made by moving the selected word upward by some fraction of its distance from the head of the list. The Promotion Algorithm is designed to tend to avoid moving the words most commonly used and the words very infrequently used very far from their original locations. In one preferred embodiment, this is achieved by altering the fraction of the remaining distance by which a selected word is promoted depending on its current relative position in the overall list. For example, words in the middle range of the list are promoted by the largest fraction with each selection. Words intermediate between where the selected word started and finished in the lexicon promotion are effectively demoted by a value of one. Conservation of the "word list mass" is maintained, so that the information regarding the relative frequency of the words in the list is maintained and updated without increasing the storage required for the list. In accordance with another aspect of the invention, the Promotion Algorithm operates both to increase the frequency of selected words, and where appropriate, to decrease the frequency of words that are not selected. For example, in a lexicon in which relative frequency information is indicated by the sequential order in which words appear in a list, a selected word which appears at position IDX in the list is moved to position (IDX/2). Correspondingly, words in the list at positions (IDX/2) down through (IDX+1) are moved down one position in the list. Words are demoted in the list when a sequence of contact points is processed and a word selection list is generated based on the calculated matching metric values, and one or more words appear in the list prior to the word selected by the user. Words that appear higher in the selection list but are not selected may be presumed to be assigned an inappropriately high frequency (i.e., they appear too high in the list). Such a word that initially appears at position IDX is demoted by, for example, moving it to position (IDX * 2 + 1). Thus, the more frequent a word is considered to be, the less it is demoted in the sense that it is moved by a smaller number of steps. In accordance with another aspect of the invention, the promotion and demotion processes may be triggered only in response to an action by the user, or may be performed differently depending on the user"s input. For example, words that appear higher in a selection list than the word intended by the user are demoted only when the user selects the intended word by "clicking and dragging" the intended word to the foremost location within the word selection list, using a stylus or mouse. Alternatively, the selected word that is manually "dragged" to a higher position in the selection list may be promoted by a larger than normal factor. For example, the promoted word is moved from position IDX to position (IDX/3). Many such variations will be evident to one of ordinary skill in the art. Figure 4F shows a preferred embodiment for adjusting the prioritization of words when a word is picked from the word choice list. Decision block 4610 determines if the selected word choice item is the exact-type word, that string of characters whose x/y locations happens to correspond exactly to the sequence of contact points, which in a preferred embodiment is displayed in a distinct location in the word choice list, such as in Figure IB where the exact-type word 154 ("rwzt" in the example shown) is separated by a solid line from other words in the list. If the chosen word is not the exact-type word, such as items 157 or 160, at block 4620 the chosen word is promoted (as in the preferred embodiment shown in Figure 4G), and at block 4630 each of the words that appeared in the word choice list ahead of the chosen word are explicitly demoted (as in the preferred embodiment shown in Figure 4H, in contrast to the incidental demotion that may occurs to one or more words simply as a consequence of the promotion of another word). If at block 4610, the chosen word is determined to be the exact-type word, decision block 4640 identifies if that word is a new word that is not yet included in the vocabulary modules. If not, then at block 4650 promotes the chosen word is promoted. If the chosen exact-type word is not yet included in the vocabulary modules, block 4660 identifies the appropriate word-list to which the word is to be added. Decision block 4665 identifies if space is available within the appropriate word-list, And if not, at block 4670 the last, least likely word in the appropriate word- list is deleted to make room for the word to be added. At block 4675 the new word is added as the least likely word in the appropriate word-list, then at block 4680 the newly added word is promoted without explicitly demoting the other words that appeared in the word choice list. Figure 4G shows a preferred embodiment of the word promotion performed in blocks 4620, 4650 and 4680. Block 4710 identifies the chosen word"s position within its word-list, and assigns idx that position value. Block 4720 defines newjdx as one half of the value of idx, specifying a position in the list halfway from the current position to the head of the list (the position of the word deemed to be most likely to be selected). Block 4730 demotes all words in positions between idx and newjdx by one position, filling the word"s old position at idx and making room for the word at newjdx. Block 4740 then promotes the chosen word by inserting it back into the list at position newjdx. Note that this preferred method of promotion essentially has the effect of decrementing by 1 the idx_multiplier calculated for the word at block 4355. Figure 4H shows a preferred embodiment of explicit word demotion performed in block 4635. Block 4810 identifies the explicitly demoted word"s position within its word-list, and assigns idx that position value. Block 4820 defines newjdx as double the value of idx plus one. Decision block 4830 compares the value of newjdx to the total number of words in the word-list. If newjdx is greater than the total number of words in the word-list, Block 4835 sets newjdx equal to the value of the number of words in the word-list, since a word can be demoted no further than the end of the list. Block 4840 promotes all words in positions between idx and newjdx by one position, filling the word"s old position at idx and making room for the word at newjdx. Block 4850 then demotes the chosen word by inserting it back into the list at position newjdx. Note that this preferred method of demotion essentially has the effect of incrementing by 1 the idx_multiplier calculated for the word at block 4355. Figures 5A through 5E are schematic views showing a sequence of character inputs as an illustrative example of entering a word on the preferred embodiment of a portable computer 102 incorporating a reduced auto-correcting keyboard system 100 formed in accordance with the present invention as shown in Figures 1A and 1B. Portable computer 102 contains a reduced keyboard 105 implemented on a touch screen display 103, which is used to generate text to be output to text display region 104. Figure 5A shows the location 510 of the first keystroke of a sequence of keystrokes corresponding to the entry of the word "text." In response to the keystroke 501, the auto-correcting keyboard system displays the word choice list region 150 super- imposed on top of the text region 104, showing a list of words and other interpretations corresponding to the keystroke. In this example, the coordinate location 510 of the keystroke is physically nearest coordinate location associated with the letter "r." The word choice list includes "R" 511 as the default choice, shown in the word choice list in the position nearest the auto-correcting keyboard region 106. Since the letter "r", when it occurs as a "word" that is only one letter in length, is found more frequently in upper case (such as when "R" appears as an initial included as part of a person"s name), "R" is offered in the word choice list in upper case. This is in accordance with the aspect of the present invention wherein information regarding the capitalization of each word is stored along with the word in the vocabulary modules so that the word can be presented in a preferred form of capitalization without requiring the user to activate keys (such as a Shift key) to specify the capitalization of the word entered. The word choice list shows "are" 512 as the next most likely choice, in accordance with the aspect of the present invention wherein a word or symbol may be associated with an arbitrary sequence of one or more letters, such that when the associated sequence of letters is entered by the user, the word or symbol is offered as a choice in the word choice list. In this example, the word "are" is associated as a "macro" expansion of the single letter "r" which is pronounced the same in English. Similarly, the word choice list shows "®" 513 as the third most likely choice, where this symbol has been included in the vocabulary modules based on the logical association with the letter "r." The word choice list shows "a" 514 as the fourth most likely choice, where "a" is a very commonly occurring word of one letter, so that it appears as a candidate in the word choice list even though the coordinate location associated with the letter "a" is relatively distant from contact location 501. Above these choices is the exact type region displaying "r" 515 as an option for selection, since the coordinate location associated with the letter "r" is closer than that of any other letter to coordinate location 510 of the keystroke. Figure 5B shows the location 520 of the next keystroke, nearest to the coordinate location associated with the letter "w." The word choice list includes "re" 521 as the default choice, "Re?" 522 as the next most likely choice, "ra" 523 as the third most likely choice and "Rs" 524 as the fourth most likely choice. Above these choices is the exact type region displaying "rw" 525 as an option for selection. Figure 5C shows the location 530 of the next keystroke, nearest to the coordinate location associated with the letter "z." The word choice list includes "tax" 531 as the default choice, "Rex" 532 as the next most likely choice, "fax" 533 as the third most likely choice and "was" 534 as the fourth most likely choice. Above these choices is the exact type region displaying "rwz" 535 as an option for selection. Figure 5D shows the location 540 of the next keystroke, very near the coordinate location associated with the letter "t." The word choice list includes "text" 541 as the default choice, "year" 542 as the next most likely choice, "rest" 543 as the third most likely choice and "fact" 544 as the fourth most likely choice. Above these choices is the exact type region displaying "rwzt" 545 as an option for selection. The word "text" is to be entered as the next word. Figure 5E shows the next keystroke at 550, in the region designated as the "space" key. The space key is outside of the auto-correcting keyboard region 106, and thus can be unambiguously associated with a specific function. The space key acts to accept the default word "text" 541 and enters the word "text" 542 in the text output region 104 at the insertion point 107 in the text being generated where the cursor was last positioned. Simultaneously, the current input sequence is cleared, and the word choice list display is removed from the display screen 103 of the portable computer 102 so that the text output region 104 is unobscured. While the preferred embodiment of the invention has been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention. For example, those skilled in the art will appreciate that the keyboard 105 and its auto-correcting keyboard region 106 may be configured in various ways, and may have a varying number of explicit function keys 108 - 122. The auto-correction technique disclosed herein is equally applicable to keyboards of different sizes, and to traditional mechanical keyboards of various sizes as well as touch-panel and touch-screen based keyboards such as the one described in the preferred embodiment. The specific format of the word choice list 150, such as the number of word choices presented, the arrangement of the word choices, and the functions associated with different areas of the word choice list may be changed. For example, those skilled in the art will appreciate that the function that consists of replacing the input sequence with a new set of x/y locations of the word selected could be omitted in certain applications. Furthermore, the specific algorithms used in promoting and demoting words within the vocabulary modules could also be altered. For example, a selected word could be promoted by moving it % of the distance to the head of its list rather than the factor of 1/2 used in the preferred embodiment described above. Although the invention is described herein with reference to the preferred embodiment, one skilled in the art will readily appreciate that other applications may be substituted for those set forth herein without departing from the spirit and scope of the present invention. Accordingly, the invention should only be limited by the Claims included below. 1. A text entry system comprising: (a) a user input device comprising an(auto-correcting keyboardjregion . comprising a plurality of the characters of an alphabet, wherein each of the plurality of characters corresponds to a location with known coordinates in the auto-correcting keyboard region, wherein each time a user interacts with the user input device within the auto-correcting keyboard region, a location associated with the user interaction is determined and the determined interaction location is added to a current input sequence of contact locations; (b) a memory containing a plurality of objects, wherein each object is further associated with a promotion value, and wherein each of the plurality of objects in memory is further associated with one or a plurality of predefined groupings of objects; (c) an output device with a text display area; and (d) a processor coupled to the user input device, memory, and output device, said processor comprising: (i) a distance value calculation component which, for each determined interaction location in the input sequence of interactions, calculates a set of distance values between the interaction locations and the known coordinate locations corresponding to one or a plurality of characters within the auto-correcting keyboard region; (ii) a word evaluation component which, for each generated input sequence, identifies one or a plurality of candidate objects in memory, and for each of the one or a plurality of identified candidate objects, evaluates each identified candidate object by calculating a matching metric based on the calculated distance values and the promotion value associated with the object, and ranks the evaluated candidate objects based on the calculated matching metric values; (iii) a selection component for identifying one or a plurality of candidate objects according to their evaluated ranking, presenting the identified objects to the user, and enabling the user to select one of the presented objects for output to the text display area on the output device; and (iv) a promotion component for setting a relativepomotion value associated with each object in memory as a function of the user setting interaction with said plurality of objects. 2. The system of Claim 1, wherein the promotion value associated with each object in memory comprises the ordinal ranking of the object with respect to other objects in memory, wherein an object associated with a higher promotion value corresponds to a numerically lower ordinal ranking, and wherein when an object is selected for output by the user, the promotion component adjusts the ordinal ranking associated with said selected object by an amount that is a function of the ordinal ranking of said object prior to said adjustment. 3. The system of Claim 1, wherein when an object is selected by the user for output to the text display area on the output device, the promotion component increases the promotion value associated with the selected object by a relatively large increment, and decreases by a relatively small decrement the promotion value associated with unselected objects that are associated with the same grouping as the selected object. 4. A text entry system comprising: (a) a user input device comprising an auto-correcting keyboard region comprising a plurality of the characters of an alphabet, wherein each of the plurality of characters corresponds to a location with known coordinates in the auto-correcting keyboard region, wherein each time a user interacts with the user input device within the auto-correcting keyboard region, a location associated with the user interaction is determined and the determined interaction location is added to a current input sequence of interaction locations; (b) a memory containing a plurality of objects, wherein each object is further associated with a promotion value, and wherein each of the plurality of objects in memory is further associated with one or a plurality of predefined groupings of objects; (c) an output device with a text display area; and (d) a processor coupled to the user input device, memory, and output device, said processor comprising: (i) a distance value calculation component which, for each generated key activation event location in the input sequence of key activation events, calculates a set of distance values between the key activation event location and the known coordinate locations corresponding to one or a plurality of keys within the auto-correcting keyboard region; (ii) a word evaluation component which, for each generated input sequence, identifies one or a plurality of candidate objects in memory, and for each of the one or a plurality of identified candidate objects, evaluates each identified candidate object by calculating a matching metric based on the calculated distance values and the promotion value associated with the object, and ranks the evaluated candidate objects based on the calculated matching metric values; (iii) a selection component for identifying one or a plurality of candidate objects according to their evaluated ranking, presenting the identified objects to the user, and enabling the user to select one of the presented objects for output to the text display area on the output device; and (iv) a promotion component for, setting a relative promotion value associated with each object in memory. 5. A text entry system comprising: (a) a user input device comprising an auto-correcting keyboard region comprising a plurality of the characters of an alphabet, wherein each of the plurality of characters corresponds to a location with known coordinates in the auto-correcting keyboard region, wherein each time a user interacts with the user input device within the auto-correcting keyboard region, a location associated with the user interaction is determined and the determined interaction location is added to a current input sequence of contact locations; (b) a memory containing a plurality of objects, wherein each object is a string of one or a plurality of characters forming a word or a part of a word, wherein each object is further associated with a frequency of use; (c) an output device with a text display area; and (d) a processor coupled to the user input device, memory, and output device, said processor comprising: (i) a distance value calculation component which, for each determined interaction location in the input sequence of interactions, calculates a set of distance values between the interaction locations and the known coordinate locations corresponding to one or a plurality of characters within the auto-correcting keyboard region; (ii) a word evaluation component which, for each generated input sequence, identifies one or a plurality of candidate objects in memory, and for each of the one or a plurality of identified candidate objects, evaluates each identified candidate object by calculating a matching metric based on the calculated distance values and the frequency of use associated with the object, and ranks the evaluated candidate objects based on the calculated matching metric values; and (iii) a selection component for identifying one or a plurality of candidate objects according to their evaluated ranking, presenting the identified objects to the user, and enabling the user to select one of the presented objects for output to the text display area on the output device. 6. The system of Claim 5, wherein the word evaluation component calculates the matching metric for each candidate object by summing the distance values calculated from each interaction location in the input sequence to the location assigned to the character in the corresponding position of the candidate object, and applying a weighting function according to the frequency of use associated with the object. 7. The system of Claim 6, wherein each character of the alphabet associated with the auto-correcting keyboard region is assigned a Cartesian coordinate and wherein the distance value calculation component calculates the distance between the interaction location and the location corresponding to a character according to standard Cartesian coordinate distance analysis. 8. The system of Claim 6, wherein the frequency of use associated with each candidate object in memory comprises the ordinal ranking of the object with respect to other objects in memory, wherein an object associated with a higher relative frequency corresponds to a numerically lower ordinal ranking. 9. The system of Claim 6, wherein the word evaluation component adds an increment value to the sum of the distance values prior to applying a weighting function according to the frequency of use associated with the candidate object. 10. The system of Claim 5, wherein the word evaluation component calculates a matching metric for each candidate object by summing the distance values calculated from each interaction location in the input sequence to the location assigned to the character in the corresponding position of the candidate object, and applying a weighting function according to the frequency of use associated with the object. 11. The system of Claim 5, wherein the selection component presents the identified one or a plurality of candidate objects for selection by the user in a candidate object list in the text display area. 12. The system of Claim 5, wherein a user selection of a character that is associated with a an interaction outside of the auto-correcting keyboard region accepts and outputs the determined highest ranked candidate object at a text insertion point in the text display area prior to outputting the selected character at the text insertion point in the text display area. 13. The system of Claim 5, wherein user selection of an object for output at a text insertion point in the text display area terminates the current input sequence such that the next interaction within the auto-correcting keyboard region starts a new input sequence. 14. The system of Claim 5, wherein the word evaluation component determines, for each determined interaction location in each input sequence of interaction locations, the closest known location corresponding to a character, and constructs an exact typing object composed of said determined corresponding characters in the order corresponding to the input sequence of interaction locations. 15. The system of Claim 5, wherein the selection component identifies the highest ranked candidate object and presents the identified object at the text insertion point in the text display area on the output device. 16. The system of Claim 5, wherein the processor further comprises a stroke recognition component that determines for each user interaction within the auto- correcting keyboard region whether the point of interactionis moved less than a threshold distance from the initial interaction location, and whereby when the point of interaction is moved less than a threshold distance from the initial interaction location, the stroke recognition component determines that the user interaction is a tap interaction, and the location determined to be associated with the user interaction is added to the current input sequence of interactionlocations to be processed by the distance value calculation component, the word evaluation component, and the selection component, and whereby when the point of interactionis moved greater than or equal to a threshold distance from the initial interaction location, the stroke recognition component determines that the user interaction is one of a plurality of stroke interaction that are associated with known system functions, and classifies the stroke interactionas one of the plurality of predefined types of stroke interactions. 17. The system of Claim 5, wherein when a threshold number of interaction locations in the input sequence are further than a threshold maximum distance from the corresponding character in the sequence of characters comprising a given candidate object, said object is identified as no longer being a candidate object for the selection component. 18. The system of Claim 5, wherein the processor further comprises a frequency promotion component for adjusting the frequency of use associated with each object in memory as a function of the number of times the object is selected by the user for output to the text display area on the output device. 19. A text entry system, substantially as herein described, particularly with reference to the accompanying drawings. There is disclosed an enhanced text entry system which uses word-level analysis to automatically correct inaccuracies in user keystroke entries on reduced keyboards such as those implemented on a touch-sensitive panel or display screen, or on mechanical keyboard systems. A method and system are defined which determine one or more alternate textual interpretations of each sequence of inputs detected within a designated auto-correcting keyboard region. The actual contact locations for the keystrokes may occur outside the boundaries of the specific keyboard key regions associated with the actual characters of the word interpretations proposed or offered for selection, where the distance from each contact location to each corresponding intended character may in general increase with the expected frequency of the intended word in the language or in a particular context. Likewise, in a mechanical keyboard system, the keys actuated may differ from the keys actually associated with the letters of the word interpretations. Each such sequence corresponds to a complete word, and the user can easily select the intended word from among the generated interpretations. Additionally, when the system cannot identify a sufficient number of likely word interpretation candidates of the same length as the input sequence, candidates are identified whose initial letters correspond to a likely interpretation of the input sequence. The approach utilizes the information contained in the entire sequence of keystrokes corresponding to a word in order to determine the user"s likely intention for each character of the sequence. The system also accommodates punctuation characters such as hyphens or apostrophes that are commonly embedded in words such as hyphenated compounds and contractions in English, and characters with special diacritics such as are commonly found in various European languages, e.g., diacritic accent. Special functions may be applied depending on where the user touches the intended string in a displayed word selection list. Once the user selects the desired string, it is automatically "accepted" for output and the next input detected starts a new input sequence corresponding to the entry of a next word.

Full Text

CROSS REFERENCE TO RELATED APPLICATIONS
This application is a Continuation of U.S. Patent Application Serial No. 09/580,319,
filed on May 26, 2000, and entitled Keyboard System With Automatic Correction,
which is incorporated herein in its entirety by this reference made thereto.
TECHNICAL FIELD OF THE INVENTION
The invention provides keyboard systems that auto-correct "sloppy" text input due to
errors in touching a keyboard or screen. More specifically, the invention provides a
reduced keyboard such as those implemented on a touch-sensitive panel or display
screen and to mechanical keyboard systems, using word-level analysis to resolve
inaccuracies (sloppy text entry) in user entries. This invention is in the field of
keypad input preferably for small electronic devices.
BACKGROUND OF THE INVENTION
For many years, portable computers have been getting smaller and smaller. The
principal size-limiting component in the effort to produce a smaller portable computer
has been the keyboard. If standard typewriter-size keys are used, the portable
computer must be at least as large as the keyboard. Miniature keyboards have been
used on portable computers, but the miniature keyboard keys have been found to be
too small to be easily or quickly manipulated with sufficient accuracy by a user.
Incorporating a full-size keyboard in a portable computer also hinders true portable
use of the computer. Most portable computers cannot be operated without placing
the computer on a flat work surface to allow the user to type with both hands. A user
cannot easily use a portable computer while standing or moving. In the latest
generation of small portable computers, called Personal Digital Assistants (PDAs),
companies have attempted to address this problem by incorporating handwriting
recognition software in the PDA. A user may directly enter text by writing on a touch-
sensitive panel or display screen. This handwritten text is then converted into digital
data by the recognition software. Unfortunately, in addition to the fact that printing or

writing with a pen is in general slower than typing, the accuracy and speed of the
handwriting recognition software has to date been less than satisfactory. To make
matters worse, today"s handheld computing devices which require text input are
becoming smaller still. Recent advances in two-way paging, cellular telephones, and
other portable wireless technologies has led to a demand for small and portable two-
way messaging systems, and especially for systems which can both send and
receive electronic mail ("e-mail").
It would therefore be advantageous to develop a much smaller keyboard for entry of
text into a computer. As the size of the keyboard is reduced, the user encounters
greater difficulty selecting the character of interest. In general there are two different
types of keyboards utilized in such portable devices. One is the familiar mechanical
keyboard consisting of a set of mechanical keys that are activated by depressing
them with a finger or thumb. However, these mechanical keyboards tend to be
significantly smaller than the standard sized keyboards associated with typewriters,
desktop computers, and even "laptop" computers. As a result of the smaller physical
size of the keyboard, each key is smaller and in closer proximity to neighboring keys.
This increases the likelihood that the user will depress an unintended key, and the
likelihood of keystroke errors tends to increase the faster the user attempts to type.
Another commonly used type of keyboard consists of a touch-sensitive panel on
which some type of keyboard overlay has been printed, or a touch-sensitive display
screen on which a keyboard overlay can be displayed. Depending on the size and
nature of the specific keyboard, either a finger or a stylus can be used to contact the
panel or display screen within the area associated with the key that the user intends
to activate. Due to the reduced size of many portable devices, a stylus is often used
in order to attain sufficient accuracy in contacting the keyboard to activate each
intended key. Here again, the small overall size of such keyboards results in a small
area being associated with each key so that it becomes quite difficult for the average
user to type quickly with sufficient accuracy.
One area of prior development in mechanical keyboards has considered the use of
keys that are much smaller than those found on common keyboards. With smaller
keys, the user must take great care in controlling each key press. One approach

(U.S. Patent 5,612,690) proposes a system that uses up to four miniature keys in
unison to define primary characters (the alphabet) and nests secondary character
rows (like numbers) between primary character rows. Selecting a secondary
character involves depressing the miniature key from each of the surrounding
primary characters. Grouping the smaller keys in this fashion creates a larger
apparent virtual key composed of four adjacent smaller keys, such that the virtual
key is large enough to be depressed using a finger. However, the finger must
contact the keys more or less precisely on the "cross-hairs" of the boundaries
between the four adjacent keys in order to depress them in unison. This makes it
still difficult to type quickly with sufficient accuracy.
Another area of prior development in both touch screen and mechanical keyboards
has considered the use of a much smaller quantity of full-size keys. With fewer keys,
each single key press must be associated with a plurality of letters, such that each
key activation is ambiguous as to which letter is intended. As suggested by the
keypad layout of a touch-tone telephone, many of the reduced keyboards have used
a 3-by-4 array of keys, where each key is associated with three or four characters
(U.S. Patent 5,818,437). Several approaches have been suggested for resolving the
ambiguity of a keystroke sequence on such a keyboard. While this approach has
merit for such keyboards with a limited number of keys, it is not applicable to
reduced size keyboards with a full complement of keys.
Another approach in touch screen keyboards has considered analyzing the
immediately preceding few characters in order to determine which character should
be generated for a keystroke that is not close to the center of the display location of
a particular character (U.S. Patent 5,748,512). When the keyboard is displayed on a
small touch screen, keystrokes that are off-center from a character are detected.
Software compares the possible text strings of probable sequences of two or three
typed characters against known combinations, such as a history of previously typed
text or a lexicon of text strings rated for their frequency within a context. When the
character generated by the system is not the character intended by the user, the
user must correct the character before going on to select the a following character,

because the generated character will be used to determine probabilities for the
following keystroke.
The fundamental problem is that the specific activations that result from a user"s
attempts to activate the keys of a keyboard do not always precisely conform to the
intentions of the user. On a touch screen keyboard, the user"s finger or stylus may
hit the wrong character or hit between keys in a boundary area not associated with a
specific character. With a miniaturized mechanical keyboard, a given keypress may
activate the wrong key, or may activate two or more keys either simultaneously or
with a "roll-over" motion that activates adjacent keys in a rapid sequence. Other
examples include common keyboards operated by users with limited ranges of
motion or motor control, where there is a limited ability to consistently strike any
particular space or key, or where the limb (such as in the case of an amputee, or the
use of gloved hands or gloved fingers) or the device used to make the entry (such as
a stylus) is far larger than the targeted key or character space.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a text entry system comprising : (a) a
user input device comprising an auto-correcting keyboard region comprising a plurality
of the characters of an alphabet, wherein each of the plurality of characters corresponds
to a location with known coordinates in the auto-correcting keyboard region, wherein
each time a user interacts with the user input device within the auto-correcting keyboard
region, a location associated with the user interaction is determined and the determined
interaction location is added to a current input sequence of contact locations ; (b) a
memory containing a plurality of objects, wherein each object is further associated with
a promotion value, and wherein each of the plurality of objects in memory is further
associated with one or a plurality of predefined groupings of objects; (c) an output
device with a text display area ; and (d) a processor coupled to the user input device,
memory, and output device, said processor comprising : (i) a distance value calculation
component which, for each determined interaction location in the input sequence of

interactions, calculates a set of distance values between the interaction locations and
the known coordinate locations corresponding to one or a plurality of characters within
the auto-correcting keyboard region ; (ii) a word evaluation component which, for each
generated input sequence, identifies one or a plurality of candidate objects in memory,
and for each of the one or a plurality of identified candidate objects, evaluates each
identified candidate object by calculating a matching metric based on the calculated
distance values and the promotion value associated with the object, and ranks the
evaluated candidate objects based on the calculated matching metric values ; (iii) a
selection component for identifying one or a plurality of candidate objects according to
their evaluated ranking, presenting the identified objects to the user, and enabling the
user to select one of the presented objects for output to the text display area on the
output device; and (iv) a promotion component for setting a relative promotion value
associated with each object in memory as a function of the user setting interaction with
said plurality of objects.
The present invention provides an enhanced text entry system that uses word-level
disambiguation to automatically correct inaccuracies in user keystroke entries.
Specifically, the present invention provides a text entry system comprising:
(a) a user input device comprising a touch sensitive surface including an
auto-correcting keyboard region comprising a plurality of the characters of an
alphabet, wherein each of the plurality of characters corresponds to a location with
known coordinates in the auto-correcting keyboard region, wherein each time a user
contacts the user input device within the auto-correcting keyboard region, a location
associated with the user contact is determined and the determined contact location
is added to a current input sequence of contact locations;
(b) a memory containing a plurality of objects, wherein each object is a
string of one or a plurality of characters forming a word or a part of a word, wherein
each object is further associated with a frequency of use;
(c) an output device with a text display area; and

(d) a processor coupled to the user input device, memory, and output
device, said processor comprising:
(i) a distance value calculation component which, for each
determined contact location in the input sequence of contacts, calculates a set of
distance values between the contact locations and the known coordinate locations
corresponding to one or a plurality of characters within the auto-correcting keyboard
region;
(ii) a word evaluation component which, for each generated input
sequence, identifies one or a plurality of candidate objects in memory, and for each
of the one or a plurality of identified candidate objects, evaluates each identified
candidate object by calculating a matching metric based on the calculated distance
values and the frequency of use associated with the object, and ranks the evaluated
candidate objects based on the calculated matching metric values; and
(iii) a selection component for (a) identifying one or a plurality of
candidate objects according to their evaluated ranking, (b) presenting the identified
objects to the user, enabling the user to select one of the presented objects for
output to the text display area on the out device.
Preferably, the selection component further comprises (c) resetting the current input
sequence of contact locations to an empty sequence upon detecting the selection by
the user of one of the presented objects for output to the text display area on the
output device.
Preferably, (a) each of the plurality of objects in memory is further associated with
one or a plurality of predefined groupings of objects; and (b) the word evaluation
component, for each generated input sequence, limits the number of objects for
which a matching metric is calculated by identifying one or a plurality of candidate
groupings of the objects in memory, and for one or a plurality of objects associated
with each of the one or a plurality of identified candidate groupings of objects,
calculates a matching metric based on the calculated distance values and the
frequency of use associated with each candidate object, and ranks the evaluated
candidate objects based on the calculated matching metric values. This reduces the
calculation required since, conversely, one or more groupings of objects are

identified as containing no candidate objects for a given input sequence of contacts,
such that a matching metric need not be calculated for any object in the groupings so
identified.
Preferably, the characters of the alphabet are arranged on the auto-correcting
keyboard region in approximately a standard "QWERTY" layout. Most preferably,
the width to height ratio of the auto-correcting keyboard region is approximately 2 to
1, or the width to height ratio of the auto-correcting keyboard region is less than 2 to
1. In one embodiment, one or a plurality of the characters arranged on the auto-
correcting keyboard region are illegible.
Preferably, the auto-correcting keyboard region includes one or a plurality of known
locations associated with one or a plurality of punctuation characters, wherein the
memory includes one or a plurality of objects in memory which include one or a
plurality of the punctuation characters associated with locations in the auto-
correcting keyboard region. Preferably, the objects in memory are further associated
with one or a plurality of modules, wherein each module comprises a set of objects
with one or a plurality of common characteristics. In one embodiment, the text entry
system comprises a module selector whereby a user can determine which modules
are to be evaluated by the word evaluation component in order to identify candidate
objects. In another embodiment, the plurality of modules comprises word stem
modules and suffix modules, wherein each word stem module comprises a logical
organization of uninflected word stem objects, and wherein each suffix module
comprises a logical organization of suffixes which can be appended to word stems to
form inflected words, whereby each word stem module is associated with one or a
plurality of suffix modules, whereby whenever the word evaluation component
calculates a matching metric value for a given word stem in a given word stem
module with respect to an initial sequence of contacts within an input sequence such
that the calculated matching metric value ranks higher than a predetermined
threshold, the word evaluation component evaluates the remaining contacts of the
input sequence with respect to the associated suffix modules, whereby whenever the
word evaluation component calculates a matching metric value for a given suffix in
one of said associated suffix modules that ranks higher than a second
predetermined threshold, said suffix is appended to said word stem to form a

completed word corresponding to a matching metric value that is a function of said
determined word stem matching metric value and said determined suffix matching
metric value.
Preferably, the word evaluation component calculates the matching metric for each
candidate object by summing the distance values calculated from each contact
location in the input sequence to the location assigned to the character in the
corresponding position of the candidate object, and applying a weighting function
according to the frequency of use associated with the object. In addition, each
character of the alphabet associated with the auto-correcting keyboard region is
assigned a Cartesian coordinate and wherein the distance value calculation
component calculates the distance between the contact location and the location
corresponding to a character according to standard Cartesian coordinate distance
analysis. Further, each character of the alphabet associated with the auto-correcting
keyboard region is assigned a Cartesian coordinate and wherein the distance value
calculation component calculates the distance between the contact location and the
location corresponding to a character as the square of the standard Cartesian
coordinate distance. The distance values are placed in a table. In addition, each
location on the auto-correcting keyboard region is defined by a horizontal and a
vertical coordinate, and wherein the distance value between a contact location and
the known coordinate location corresponding to a character comprises a horizontal
and a vertical component, wherein the vertical component is adjusted by a weighting
factor in calculating the distance of the contact location from the character. The
word evaluation component adds an increment value to the sum of the distance
values prior to applying a weighting function according to the frequency of use
associated with the candidate object. Most preferably, the increment value is a fixed
value that is approximately twice the average distance between adjacent locations
on the auto-correcting keyboard region corresponding to characters. The frequency
of use associated with each candidate object in memory comprises the ordinal
ranking of the object with respect to other objects in memory, wherein an object
associated with a higher relative frequency corresponds to a numerically lower
ordinal ranking. Most preferably, the frequency weighting function applied by the
word evaluation component to the summed distance values for a candidate object

comprises multiplying the sum of the distance values by the base 2 logarithm of the
ordinal ranking of the object.
Preferably, objects in memory are stored such that the objects are classified into
groupings comprising objects of the same length. The word evaluation component
limits the number of objects for which a matching metric is calculated by initially
identifying candidate groupings of objects of the same length as the number of
inputs in the input sequence. Most preferably, if fewer than a threshold number of
candidate objects are evaluated to have a matching metric score better than a
threshold value, the word evaluation component identifies candidate groupings of
objects of progressively longer lengths and calculates the matching metric for the
objects in the identified groupings until said threshold number of candidate objects
are evaluated to have a matching metric score better than said threshold. Further,
the word evaluation component calculates the matching metric for each candidate
object by summing the distance values calculated from each contact location in the
input sequence to the location assigned to the character in the corresponding
position of the candidate object and adding an increment value, and applying to this
sum a weighting function according to the frequency of use associated with the
object, and wherein the increment value added to the sum of the distance values is a
value that is based on the difference between the number of characters in the
candidate object and the number of inputs in the current input sequence.
Preferably, the word evaluation component calculates the matching metric for each
candidate object by summing the distance values calculated from each contact
location in the input sequence to the location assigned to the character in the
corresponding position of the candidate object, and applying a weighting function
according to the frequency of use associated with the object. Most preferably, the
frequency of use associated with each candidate object in memory comprises the
ordinal ranking of the object with respect to other objects in one or a plurality of sub-
groupings in memory with which said object is associated, wherein an object
associated with a higher relative frequency corresponds to a numerically lower
ordinal ranking. In addition, for each calculated distance value between a contact
location in the input sequence and the known coordinate location corresponding to a

character within the auto-correcting keyboard region wherein said calculated
distance exceeds a threshold distance value, for each object in memory in which
said character occurs at a position in the sequence of the characters of said object
corresponding to the position of said contact location in said input sequence, said
object is ranked by the word evaluation component as an object that is excluded
from presentation to the user for selection. One or a plurality of the identified
candidate groupings of the objects in memory comprise objects that are excluded
from presentation to the user for selection, wherein at least one of the calculated
distance values included in the calculated sum of distance values for each object in
said one or identified candidate groupings of objects exceeds a threshold distance
value. The auto-correcting keyboard region is separated into two or more predefined
clustering regions, each of which contains the known locations of one or a plurality of
characters, and wherein each objects in memory is assigned to a predefined group
according to which of said two or more predefined clustering regions contain the
known locations corresponding to one or a plurality of the initial characters of said
object. In one embodiment, the auto-correcting keyboard region is separated into
three predefined clustering regions, and wherein each object in memory is assigned
to one of nine predefined groupings based which of the three predefined clustering
regions contain the known locations corresponding to each of the first two characters
of said object.
Preferably, for each character corresponding to a known location in the auto-
correcting keyboard region, a region is predefined around one or a plurality of said
known locations wherein the distance between an input contact location falling within
said predefined region and the known character location within said predefined
region is calculated as a distance of zero. Most preferably, the relative sizes of said
predefined regions correspond to the relative frequencies of occurrence of the
characters associated with the known locations within said predefined regions. The
predefined region around the known location of a character corresponds to a
displayed key on the touch screen. Further, at least one of the locations with known
coordinates in the auto-correcting keyboard region corresponds to a plurality of
characters, one or a plurality of which include various diacritic marks, wherein the
plurality of characters comprise variant forms of a single base character, and

wherein objects in memory are stored with their correct accented characters.
Preferably, the selection component presents the identified one or a plurality of
candidate objects for selection by the user in a candidate object list in the text
display area. Most preferably, the selection component identifies the highest ranked
candidate object and presents the identified object in the candidate object list in the
position nearest to the auto-correcting keyboard region. In addition, user selection of
a character that is associated with a contact outside of the auto-correcting keyboard
region accepts and outputs the determined highest ranked candidate object at a text
insertion point in the text display area prior to outputting the selected character at the
text insertion point in the text display area. The user selection of an object for output
at a text insertion point in the text display area terminates the current input sequence
such that the next contact within the auto-correcting keyboard region starts a new
input sequence. In addition, the selection component detects a distinctive manner of
selection that is used to select a candidate object, and wherein upon detecting that
an object has been selected through said distinctive manner, the system replaces
the current input sequence of actual contact locations with an input sequence of
contact locations corresponding to the coordinate locations of the characters
comprising the selected object, and wherein a next contact in the auto-correcting
keyboard region is appended to the current input sequence.
Preferably, the word evaluation component determines, for each determined contact
location in each input sequence of contact locations, the closest known location
corresponding to a character, and constructs an exact typing object composed of
said determined corresponding characters in the order corresponding to the input
sequence of contact locations. Most preferably, for each input sequence of contact
locations, the selection component presents said exact typing object to the user for
selection. Further, when the user selects said exact typing object for output to the
text display area on the output device and said exact typing object is not already
included as one of the objects in memory, said exact typing object is added to the
memory. Prior to displaying the exact typing object to the user for selection, the
selection component compares the exact typing object to a database of offensive
objects, each of which is associated with an acceptable alternative object for display,

and if a match is found, replaces the exact typing object with the associated
acceptable object for presentation to the user.
Preferably, the selection component identifies the highest ranked candidate object
and presents the identified object at the text insertion point in the text display area on
the output device. Most preferably, the text entry system includes a select key
region associated with an object selection function, wherein when said select key
region is contacted, the object presented at the text insertion point in the text display
area on the output device is replaced with next highest ranked object of the identified
one or a plurality of candidate objects.
Preferably, the text entry system includes a delete key region associated with a
delete function, wherein when the current input sequence includes at least one
contact and said delete key region is contacted, the last input contact from the
current input sequence of contacts is deleted, without terminating the current input
sequence. In another preferred embodiment, the text entry system includes an Edit
Word key region associated with an Edit Word function, wherein when no current
input sequence exists and said Edit Word key region is contacted:
(i) when the text insertion point in the text display area on the output device is
contained within a previously output word, the system establishes a new current
input sequence consisting of a sequence of contact locations corresponding to the
coordinate locations associated with the characters of said word, and
(ii) when the text insertion point in the text display area on the output device is
located between two previously output words, the system establishes a new current
input sequence consisting of a sequence of contact locations corresponding to the
coordinate locations associated with the characters of the word adjacent to the text
insertion point, and
wherein the text entry system processes said new current input sequence and
determines a corresponding ranking of new candidate objects, and wherein selection
of one of the new candidate objects replaces the previously output word used to
establish said new current input sequence.
Preferably, as the user enters an input sequence by performing a sequence of

contact actions within the auto-correcting keyboard region, the processor determines
the location associated with each user contact action by recording each contact
action in the sequence as an indexed primary set of a fixed number of two or more
regularly spaced contact points along the path traced out by the user contact action,
and by assembling two or more corresponding secondary sets of contact points by
taking, for each of the two or more possible primary index values, the sequence of
contact points having the same index value, one from each recorded indexed
primary set of contact points, and by determining with respect to each word is
selected by the user for output, a minimizing primary index value that identifies the
assembled secondary set of contact points for which the calculated distance
between the assembled secondary set of contact points and the known locations
corresponding to the characters of the selected word is minimized, and whereby for
a next input sequence of user contact actions, the distance value calculation
component calculates distance values based on a sequence of contact locations
determined as the secondary set of contact point locations assembled from said next
input sequence of contact actions corresponding to the determined minimizing
primary index value. Most preferably, for a plurality of user input sequences, the
distance value calculation component computes a running average of the distance
calculations for each of the two or more assembled secondary sets corresponding to
the two or more primary index values, and whereby for a next input sequence of
contact actions, the distance value calculation component calculates distance values
based on a sequence of contact locations determined as the secondary set of
contact point locations assembled from said next input sequence of contact actions
corresponding to the minimizing primary index value determined with respect to said
computed running averages. Further, for each primary index value, the distance
value calculation component computes a running average of the horizontal and
vertical components of the offset of the coordinate location corresponding to each
character of each selected word with respect to the coordinate location of each
corresponding recorded indexed contact point, and wherein in performing distance
calculations for the word evaluation component, the distance value calculation
component adjusts the horizontal and vertical coordinates of each recorded indexed
contact point by an amount that is a function of the average horizontal and vertical
offsets computed with respect to the corresponding primary index value.

Preferably, for each input contact location, the distance value calculation component
computes a running average of the horizontal and vertical components of the offset
of the coordinate location corresponding to each character of each selected word
with respect to the coordinates of each corresponding input contact location, and
wherein in performing distance calculations for the word evaluation component, the
distance value calculation component adjusts the horizontal and vertical coordinates
of each input contact location by amounts that are functions of the computed
average signed horizontal and vertical offsets. Alternatively, the processor further
comprises a stroke recognition component that determines for each user contact
action within the auto-correcting keyboard region whether the point of contact is
moved less than a threshold distance from the initial contact location prior to being
lifted from the touch sensitive surface, whereby:
(a) when the point of contact is moved less than a threshold distance from
the initial contact location prior to being lifted from the touch sensitive surface, the
stroke recognition component determines that the user contact is a tap contact, and
the location determined to be associated with the user contact is added to the
current input sequence of contact locations to be processed by the distance value
calculation component, the word evaluation component, and the selection
component, and
b) when the point of contact is moved greater than or equal to a threshold
distance from the initial contact location prior to being lifted from the touch sensitive
surface, the stroke recognition component determines that the user contact is one of
a plurality of stroke contacts that are associated with known system functions, and
classifies the stroke contact as one of the plurality of predefined types of stroke
contacts.
Preferably, when a threshold number of contact locations in the input sequence are
further than a threshold maximum distance from the corresponding character in the
sequence of characters comprising a given candidate object, said object is identified
as no longer being a candidate object for the selection component. Alternatively, the
processor further comprises a frequency promotion component for adjusting the
frequency of use associated with each object in memory as a function of the number

of times the object is selected by the user for output to the text display area on the
output device. Moreover, the frequency of use associated with each object in
memory comprises the ordinal ranking of the object with respect to other objects in
memory, wherein an object associated with a higher relative frequency corresponds
to a numerically lower ordinal ranking, and wherein when an object is selected for
output by the user, the frequency promotion component adjusts the ordinal ranking
associated with said selected object by an amount that is a function of the ordinal
ranking of said object prior to said adjustment. Further, the function used by the
frequency promotion component to determine the amount by which the ordinal
ranking associated with a selected object is adjusted reduces said amount for
objects with ordinal rankings that are associated with relatively higher frequencies of
use. The frequency promotion component analyzes additional information files that
are accessible to the text entry system to identify new objects contained in said files
that are not included among the objects already in said memory of said text entry
system, and wherein said newly identified objects are added to the objects in
memory as objects that are associated with a low frequency of use. Further, the
frequency of use associated with a newly identified object that is added to the
objects in memory is adjusted by the frequency promotion component as a function
of the number of times that the newly identified object is detected during the analysis
of said additional information files.
Preferably, the processor further comprises a frequency promotion component for
adjusting the frequency of use associated with each object in memory as a function
of the number of times the object is selected by the user for output to the text display
area on the output device with respect to other objects associated with the same
predefined grouping. Most preferably, when an object is selected by the user for
output to the text display a>ea on the output device, the frequency promotion
component increases the value of the frequency associated with the selected object
by a relatively large increment, and decreases by a relatively small decrement the
frequency associated with unselected objects that are associated with the same
grouping as the selected object. Alternatively, information regarding the
capitalization of one or a plurality of objects is stored along with the objects in
memory and wherein the selection component presents each identified object in a

preferred form of capitalization according to the stored capitalization information. In
another embodiment, one or a plurality of objects in memory are associated with a
secondary object in memory comprising a sequence of one or a plurality of letters or
symbols, and wherein when the selection component identifies one of said objects
for presentation to the user based on the matching metric calculated by the word
evaluation component, the selection component presents the associated secondary
object for selection.
The present invention further provides a text entry system comprising:
(a) a user input device comprising a keyboard constructed with mechanical
keys including an auto-correcting keyboard region comprising a plurality of keys,
each corresponding to a character of an alphabet and each at a known coordinate
location, wherein each time a user activates one or a plurality of adjacent keys in the
auto-correcting keyboard region within a predetermined threshold period of time to
generate a key activation event, a determined location corresponding to the key
activation event is appended to a current input sequence of the determined locations
of the key activation events;
(b) a memory containing a plurality of objects, wherein each object is a
string of one or a plurality of characters forming a word or a part of a word, wherein
each object is further associated with a frequency of use;
(c) an output device with a text display area; and
(d) a processor coupled to the user input device, memory, and output
device, said processor comprising:
(i) a distance value calculation component which, for each
generated key activation event location in the input sequence of key activation
events, calculates a set of distance values between the key activation event location
and the known coordinate locations corresponding to one or a plurality of keys within
the auto-correcting keyboard region;
(ii) a word evaluation component which, for each generated input
sequence, identifies one or a plurality of candidate objects in memory, and for each
of the one or a plurality of identified candidate objects, evaluates each identified
candidate object by calculating a matching metric based on the calculated distance

values and the frequency of use associated with the object, and ranks the evaluated
candidate objects based on the calculated matching metric values; and
(iii) a selection component for identifying one or a plurality of
candidate objects according to their evaluated ranking, presenting the identified
objects to the user, and enabling the user to select one of the presented objects for
output to the text display area on the output device.
Preferably, (a) each of the plurality of objects in memory is further associated with
one or a plurality of predefined groupings of objects; and (b) the word evaluation
component, for each generated input sequence, limits the number of objects for
which a matching metric is calculated by identifying one or a plurality of candidate
groupings of the objects in memory, and for one or a plurality of objects associated
with each of the one or a plurality of identified candidate groupings of objects,
calculates a matching metric based on the calculated distance values and the
frequency of use associated with each candidate object, and ranks the evaluated
candidate objects based on the calculated matching metric values. Further, the keys
associated with the characters of the alphabet are arranged in the auto-correcting
keyboard region in approximately a standard "QWERTY" layout.
Preferably, when a key activation event is detected comprising the simultaneous
activation of a plurality of adjacent keys in the auto-correcting keyboard region, a
location corresponding to said key activation event is determined as a function of the
locations of the simultaneously activated keys, and said determined location is
appended to the current input sequence of the locations of the key activation events.
Most preferably, the function used to determine the location of said key activation
event comprises the computation of the location corresponding to the center of the
locations of the simultaneously activated keys. Further, the function used to
determine the location of said key activation event comprises the computation of the
location corresponding to the weighted center of gravity of the locations of the
simultaneously activated keys, wherein the weights associated with each of the keys
in the auto-correcting keyboard region correspond to the relative frequencies of
occurrence of the characters associated with the keys, wherein said relative
frequencies are determined with respect to the frequencies of occurrence of the

characters in the objects in memory.
Preferably, when a key activation event is detected comprising the activation of a
plurality of adjacent keys in the auto-correcting keyboard region within a
predetermined threshold period of time, wherein at all times during said key
activation event at least one of said plurality of adjacent keys is activated and
wherein at any moment during said key activation event that any subset of said
plurality of keys is simultaneously activated, said simultaneously activated subset of
keys comprises keys that are contiguously adjacent, a location corresponding to said
key activation event is determined as a function of the locations of the entire plurality
of adjacent keys detected during said key activation event, and said determined
location is appended to the current input sequence of the locations of the key
activation events. Most preferably, the function used to determine the location of
said key activation event comprises the computation of the location corresponding to
the center of the locations of the simultaneously activated keys. Further, the function
used to determine the location of said key activation event comprises the
computation of the location corresponding to the weighted center of gravity of the
locations of the simultaneously activated keys, wherein the weights associated with
each of the keys in the auto-correcting keyboard region correspond to the relative
frequencies of occurrence of the characters associated with the keys, wherein said
relative frequencies are determined with respect to the frequencies of occurrence of
the characters in the objects in memory.
Preferably, the auto-correcting keyboard region includes one or a plurality of keys
associated with one or a plurality of punctuation characters, wherein said memory
includes one or a plurality of objects in memory which include one or a plurality of the
punctuation characters associated with keys in said auto-correcting keyboard region.
Alternatively, the word evaluation component calculates the matching metric for each
candidate object by summing the distance values calculated from determined
location in the input sequence to the known location of the key corresponding to the
character in the corresponding position of the candidate object, and applying a
weighting function according to the frequency of use associated with the object. In
another embodiment, at least one of the keys in the auto-correcting keyboard region

corresponds to a plurality of characters, one or a plurality of which include various
diacritic marks, wherein the plurality of characters comprise variant forms of a single
base character, and wherein objects in memory are stored with their correct
accented characters.
Preferably, the selection component presents the identified one or a plurality of
candidate objects for selection by the user in a candidate object list in the text
display area. Most preferably, the selection component identifies the highest ranked
candidate object and presents the identified object in the candidate object list in the
position nearest to the auto-correcting keyboard reg on. Further, activation of a key
that is associated with a character, wherein the key is not included within the auto-
correcting keyboard region, accepts and outputs the determined highest ranked
candidate object at a text insertion point in the text display area prior to outputting
the selected character at the text insertion point in the text display area. Further, the
user selection of an object for output at a text insertion point in the text display area
terminates the current input sequence such that the next key activation event within
the auto-correcting keyboard region starts a new input sequence.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1A is a schematic view of a preferred embodiment of a portable computer
incorporating a reduced keyboard system of the present invention which
automatically corrects input keystrokes; Figure 1B is the same schematic view
showing an embodiment of a word choice list that is displayed after the user has
entered a sequence of keystrokes within the auto-correcting keyboard region.
Figure 2 is a hardware block diagram of the reduced keyboard system of Figures 1A
and 1B.
Figure 3 is a schematic view of a preferred embodiment of an auto-correcting
keyboard region of the reduced keyboard system of the present invention which
automatically corrects input keystrokes, showing its division into three clustering
regions and three example contact points.
Figures 4A through 4K show a flow chart of a preferred embodiment of software to
determine the intended text to be generated in response to an input sequence of
keystrokes.
Figures 5A through 5E are schematic views showing a sequence of character inputs
as an illustrative example of entering a word on a preferred embodiment of a
portable computer incorporating a reduced keyboard system of the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
Since user keystroke entries are presumed to be possibly inaccurate, there is some
ambiguity as to how a particular sequence of keystrokes should be interpreted in
order to generate the sequence of characters that the user intended to type. The
present invention provides a process and system (i.e., apparatus or device having
the inventive software within) wherein the user is presented with one or more
alternate interpretations of each keystroke sequence corresponding to a word such
that the user can easily select the desired interpretation, and wherein no special
action need be taken to select the interpretation deemed most likely. This approach
enables the system to utilize the information contained in the entire sequence of
keystrokes corresponding to a word in resolving what the user"s likely intention was
for each character of the sequence.
The method of the present invention has two very significant advantages over prior
systems, such as that disclosed by U.S. Patent 5,748,512. One is that the inventive
system is able to utilize information regarding both preceding and succeeding
keystrokes in determining the intended character for each keystroke, together with
the length of the word and a database that includes information as to the relative
frequencies of potentially matching words. This is far more information than can be
utilized by prior systems, and greatly increases the performance of the system. The
second advantage is that the user need only interact and respond to predictions by
the system at word boundaries, after all the characters of each word have been

entered, rather than having to examine, and accept or reject each character
generated by the system immediately following each keystroke. This greatly
enhances the usability of the system, since the user is thus able to focus much more
on the entry of text on the keyboard without needing to constantly divert his attention
to the display following each keystroke. Another advantage is the system also
accommodates punctuation characters such as a hyphen or apostrophe that are
commonly embedded in words such as hyphenated compounds and contractions in
English. Such embedded punctuation characters can be associated with one or
more keys or character locations included among those associated with alphabetic
characters.
Definitions
"Keyboard" shall mean include any input device having defined areas including, but
not limited to, a touch sensitive screen having a defined area containing a plurality of
defined locations associated with characters, a touch sensitive screen having
defined areas for keys, discrete mechanical keys, or membrane keys.
"Auto-correcting keyboard region" refers to that region of the keyboard having the
inventive auto-correcting process and features applied.
"Object" shall mean a string of one or more characters forming a word, wordstem,
prefix or suffix.
"Wordstem" shall mean a "root word." For example, the word "interestingly" consists
of the root word "interest" to which the suffix "ingly" has been appended.
"Module" is a logical organization of objects based upon characteristics of the
objects. For example, (1) words of the French language versus words of the English
language are arranged in different modules, (2) a verb stem module contains verb
stems to each of which one or more possible suffixes may be appended, wherein the
suffixes are contained in one or more suffix modules associated with the verb stem
module, wherein the suffixes from the suffix modules can be appended to a verb
stem in the verb stem module to form a properly inflected word.

A "contact action" comprises the entirety of a user action which results in a contact
with the keyboard, starting from the first point and moment of contact, and including
any additional contiguous points of contact that are detected up to the moment at
which contact with the keyboard is terminated. Examples of contact actions include,
but are not limited to, physically touching a touch sensitive screen with a stylus or
finger and moving the stylus or finger to a greater or lesser degree prior to lifting the
stylus or finger from the screen, or moving a mouse cursor to position it within a
displayed keyboard region and clicking the mouse button then moving the mouse
cursor to a greater or lesser degree prior to releasing the mouse button.
A "contact location" is the location determined to correspond to a user action which
results in a contact with the keyboard. Methods of determining a contact location
include, but are not limited to, detecting the point on a touch screen or similar device
where the initial or final contact was made by the user, or detecting a user action
such as a mouse click whereby the contact location is determined corresponding to
the location of the mouse cursor within a displayed keyboard region at the time of
that the mouse button is first depressed.
A "distance value calculation component" calculates a set of distance values
between a contact location and the known coordinate locations corresponding to one
or more characters within the auto-correcting region of the keyboard. The method
used to calculate the distance between two locations includes, but is not limited to,
assigning Cartesian coordinates to each location and calculating the distance
between two locations according to standard Cartesian coordinate distance analysis,
assigning Cartesian coordinates to each location and calculating the distance
between two locations as the square of the standard Cartesian coordinate distance,
and assigning Cartesian coordinates to each location and calculating the distance
between two locations according to Cartesian coordinate distance analysis where
the vertical component is adjusted by a weighting factor.
A "matching metric" is a score calculated for an object with respect to an input
sequence of contact locations as a means to estimate how likely it is that the object

corresponds to the user"s intention in performing the input sequence of contacts. For
example, a matching metric can be calculated in one embodiment as the sum of the
squares of the distances from each contact location in the entry sequence to the
location assigned to the character in the corresponding position of a given candidate
object, and then multiplying the sum of the squared distances by a frequency
adjustment factor, which in one preferred embodiment is calculated as the base 2
logarithm of the ordinal position of the word with respect to other potential candidate
objects, where objects associated with higher relative frequencies correspond to
lower ordinal positions, i.e., the most frequent object is at position "1." Thus, in this
embodiment, the lower the numeric value of the calculated matching metric, the
more likely a given object is deemed to correspond to the user"s intention in
generating a sequence of contact points.
An "evaluated ranking" is the relative prioritization of a set of candidate objects
according the likelihood that each of the objects corresponds to the user"s intention
in generating a sequence of contact points, where this likelihood is determined
according to the matching metric calculated for the objects.
A "key activation event" includes but is not limited to an event that comprises the
entirety of the activated keys detected during the course of a user action which
results in the activation of one or more adjacent keys of a mechanical keyboard,
starting from the first depressed key and including the time at which it was
depressed, and including any additional keys that are adjacent to the first depressed
key and that are simultaneously depressed, detected up to the moment at which
neither the first key nor any simultaneously depressed adjacent key is depressed.
With regard to Figure 1A, a reduced auto-correcting keyboard system 100 formed in
accordance with the present invention is depicted incorporated in a palmtop portable
computer 102. Portable computer 102 contains a reduced keyboard 105
implemented on a touch screen display 103, which is used to generate text to be
output to text display region 104. For purposes of this application, the term
"keyboard" is defined broadly to include any input device having defined areas
including, but not limited to, a touch screen having defined areas for keys, discrete

mechanical keys, or membrane keys. Keyboard 105 has an auto-correcting
keyboard region 106 wherein the 26 letters of the English alphabet plus an
apostrophe are displayed in approximately the standard "QWERTY" arrangement. In
this preferred embodiment, it is relevant to note that the aspect ratio of the keyboard
106 (the ratio of its width to its height) is less than 2:1, whereas for a standard
computer keyboard or typewriter, this ratio is approximately 4:1. This aspect ratio
renders the keyboard 106 easier to use in that the less elongated shape tends to
minimize the distance the stylus must be moved between letters at opposite ends of
the keyboard, while enhancing the system"s ability to distinguish between letters in
adjacent rows by increasing their relative separation. This makes it easier for the
user to contact the keyboard in a location that is relatively close to the intended letter
in the vertical dimension. Consequently, in a preferred embodiment, the distance of
a contact point from a letter is calculated using a method that increases the relative
weight of the vertical component of the distance with respect to the horizontal
component.
The keyboard may be of any size, very small or very large. For example, an
implementation using a space for the auto-correcting keyboard as small as 1 cm by
0.5 cm that includes all 26 letters of the English alphabet has been found to be quite
usable with a small plastic stylus. When embodied as a keyboard of this size, a well-
known key arrangement such as the standard "QWERTY" layout may be used. With
this key arrangement it is not necessary to include legible displayed characters,
because the relative locations of each character in the defined keyboard space are
well known to users familiar with such a standard layout. Alternatively, a very small
label such as a dot may be displayed at each character location to aid the user.
In accordance with another aspect of the invention, the internal, logical
representation of the characters need not mirror the physical arrangement
represented by the labels on the actual characters in the auto-correcting keyboard.
For example, in a database constructed to represent a French vocabulary module,
the accented characters A and A may also be associated with the unaccented
character A that appears as an explicitly labeled key in a mechanical keyboard or
character location in a keyboard implemented on a touch-sensitive display screen.

The word entries in the French vocabulary module include the necessary information
to determine whether a given word is spelled with an accented or unaccented
character so that the correctly spelled form can be automatically generated based on
an input contact point sufficiently near the key or character location associated with
the unaccented character. This is a significant advantage for languages such as
French that often use accented characters since no special typing techniques,
additional keys, or additional keystrokes are required to type words using their
correct spellings including appropriate accents.
The preferred keyboard of Figure 1A contains six additional keys associated with the
execution of specific functions or the generation of specific characters. These keys
include a Shift key 108, a Space key 110, a Backspace key 112, an Edit Word key
114, a Symbols Mode key 116, a Return (or "Enter") key 118, an Alternate Keyboard
Mode key 120, and a Numeric Mode key 122. The function of these keys will be
discussed in conjunction with Figure 1B.
Text is generated using the keyboard system via keystrokes on the auto-correcting
keyboard 106. As a user enters a keystroke sequence using the keyboard, text is
displayed on the computer display 103. Two overlapping regions are defined on the
display each of which display information to the user. An upper output text region
104 displays the text entered by the user and serves as a buffer for text input and
editing. A word choice list region 150, which in a preferred embodiment shown in
Figure 1B is super-imposed on top of the text region 104, provides a list of words
and other interpretations corresponding to the keystroke sequence entered by a
user. The word choice list region 150 aids the user in correcting inaccuracies in the
entered keystrokes. In another embodiment, the system may be implemented on a
device with limited display space, and display only the Default or most likely word
object at the insertion point 107 in the text being generated.
In another preferred embodiment, the keyboard of the present invention is
implemented using a keyboard device. Examples of such devices would include the
standard desktop keyboard used with personal computers, or much smaller
mechanical keyboards such as those commonly used in portable, hand-held

electronic devices such as two-way pagers that, in the case of English and other
Latin-alphabet based languages, include a full set of at least 26 small, closely
spaced keys, often arranged in the standard "QWERTY" layout. This embodiment is
logically identical to a touch screen implementation in which the points at which
physical contact with the screen can be detected correspond exactly to the set of
coordinates associated with the characters of the keyboard. Thus, the methods of
the present invention may be applied equally well to such mechanical keyboard
implementations.
However, mechanical keyboards have a distinguishing characteristic from touch
screens in that a single inaccurate or erroneous key activation may not only consist
of activating a key other than the one intended, but also may consist of simultaneous
or closely sequential activation of two or more adjacent keys, wherein the activated
keys may or may not include among them the intended key. Thus, in accordance
with another aspect of the invention, a sequence of keystrokes on the auto-
correcting keyboard is filtered through a window of both time and space, in that a
single intended keystroke may activate more than one adjacent key. An example is
when a user depresses 2, 3 or 4 keys when the user"s finger is not properly aligned
with the intended key or any single specific key. Thus, following each received
keystroke, the keystroke is not processed until after the system waits for a very brief
timeout threshold, or until a keystroke is received on a non-adjacent key. If the next
keystroke occurs on an adjacent key, or if multiple keystrokes occur on adjacent
keys, before the expiration of the timeout threshold, the detected keys are regarded
as a single keystroke event. In such cases, a "virtual" point of contact is calculated
at the center of the set of "simultaneously" activated keys. The distances from this
calculated "virtual" contact point and the known character locations (key locations in
this case of a mechanical keyboard) are calculated by interpolating to a logical
coordinate frame with a finer resolution than that of the physical sensors (keys).
In another embodiment of the invention, keystrokes on the auto-correcting keyboard
are not matched to characters in isolation, but rather entire sequences of keystrokes
corresponding to completed words are matched against a lexicon of candidate words
that includes information regarding the relative frequency with which each word

appears in a representative corpus of usage. In this way, the system is often able to
correctly compensate for occasional keystroke errors of a larger than average
magnitude, or even multiple errors of a relatively larger magnitude when the intended
word is of high relative frequency. This word-level analysis of keystroke input
sequences are a key factor in enabling the inventive system to flexibly accommodate
user keystroke errors.
The word-level analysis of keystroke sequences enables the system to generate
punctuation characters such as a hyphen or apostrophe that are commonly
embedded in words such as hyphenated compounds and contractions in English.
Such embedded punctuation characters can be associated with one or more keys or
character locations included in the auto-correcting keyboard among those associated
with alphabetic characters. When more than one punctuation character is
associated with a single key, the specific punctuation character intended can be
disambiguated based on the information included in the lexicon. Thus, for example,
if a word in the lexicon includes an apostrophe in a position corresponding to a key
contact in the region of an ambiguous punctuation key, the matching algorithm will
automatically identify the associated word and disambiguate the keystroke as an
apostrophe. Simultaneously, the system can separately analyze the keystroke
sequences preceding and following the key contact in the region of the punctuation
key to determine the most likely matching words in the lexicon and calculate the
likelihood that a hyphenated compound was intended. In the case of a keyboard
implemented on a touch-sensitive display screen, other symbols, numbers or other
characters not commonly used are relegated to a separate symbol selection
scheme, preferably through presentation in a series of temporarily displayed tables.
Such Symbol Tables are preferably accessed through a function key or touch entry
element assigned adjacent to the auto-correcting keyboard region. In the case of a
mechanical keyboard, these other symbols, numbers and uncommon characters are
often accommodated through additional keys not included in the auto-cbrrecting
keyboard.
In accordance with another aspect of the invention, candidate words that match the
input sequence are presented to the user in a word selection list on the display as

each input is received. In accordance with another aspect of the invention, the word
interpretations are presented in the order determined by the matching metric
calculated for each candidate word, such that the words deemed to be most likely
according to the matching metric appear first in the list. Selecting one of the
proposed interpretations of the input sequence terminates an input sequence, so
that the next keystroke inside the auto-correcting keyboard region starts a new input
sequence. In accordance with yet another aspect of the invention, only a single
word interpretation appears on the display, preferably at the insertion point for the
text being generated. The word interpretation displayed is that deemed to be most
likely according to the matching metric. By repeatedly activating a specially
designated selection input, the user may replace the displayed word with alternate
interpretations presented in the order determined by the matching metric. An input
sequence is also terminated following one or more activations of the designated
selection input (effectively selecting exactly one of the proposed interpretations of
the sequence for actual output by the system), so that the next keystroke inside the
auto-correcting keyboard region starts a new input sequence.
In accordance with another aspect of the invention, for each input sequence of
contact points, a word is constructed by identifying the character nearest each
contact point and composing a word consisting of the sequence of identified
characters. This "Exact Type" word is then presented as a word choice in the word
selection list. This word may then be selected in the usual manner by, for example,
touching it in the word selection list. Exact Type entries can be edited by, for
example, pressing a backspace key to delete one character at a time from the end of
the word. Once the user selects the Exact Type word, it is automatically "accepted"
for output and is added to the information being composed. When so selected, the
Exact Type string may be added as a candidate for inclusion into the lexicon of
words so that in the future it can be typed using the auto-correcting keyboard without
needing to precisely contact each letter of the word as is necessary in first entering
an Exact Type entry.
Figure 1B shows a preferred embodiment of a word choice list 150 that is displayed
after the user has entered a sequence of keystrokes within the auto-correcting

keyboard region 106. The word choice list includes a Cancel key 152, wherein
contacting the Cancel key causes the system to discard the current input sequence,
clearing the word choice list and causing the system to restore the display of any text
or graphics obscured by the appearance of the word choice list. The "Exact Type"
word 154 shows the sequence of letters closest to the actual contact points of the
input sequence, whether or not these correspond to any word in any vocabulary
module. In the example shown in Figure 1B, the Exact Type word "rwzt" does not
correspond to an English word. In a preferred embodiment, selecting the Exact Type
word for output results in the automatic addition of that word to the appropriate
vocabulary module if it is not already included. The Default word 160 ("text" in the
example of Figure 1B) is the word from the vocabulary modules determined to have
the lowest value of the matching metric (that is, the more likely the word corresponds
to the user"s intention), and in a preferred embodiment, is shown at the bottom of the
word choice list, nearest to the auto-correcting keyboard region 106. Similarly, three
alternate word choices 157 are shown in the list in an order determined by their
corresponding matching metric values.
The Symbols Mode key 116, the Alternate Letter Mode key 120, and the Numeric
Mode key 122 each cause a corresponding keyboard of punctuation and symbols,
alphabetic letters, and numeric digits, respectively, to appear on the display screen.
The user can then select the desired character or characters from the displayed
keyboard. If a word choice list was displayed prior to displaying such an alternate
keyboard, the selection of any character from the displayed alternate keyboard
causes the Default word of the previously displayed word choice list to be output to
the output text region 104 prior to outputting the selected character from the
alternate keyboard. Similarly, if a word choice list was displayed prior to contacting
the Space key 110 or the Return key 118, the Default word 160 is flushed to the
output text region 104 prior to generating a single space or carriage return character,
respectively.
In the preferred embodiment, the Shift key 108 functions as a latching Shift key, such
that contacting it causes the letter associated with the next contact in the auto-
correcting keyboard 106 to be generated as an upper-case letter. In another

preferred embodiment, two successive contacts on the Shift key 108 puts the system
in "Caps-Lock," and a subsequent activation cancels "Caps-Lock" mode. Backspace
key 112 deletes the last input contact from the current sequence of contacts if one
exists, and otherwise deletes the character to the left of the cursor at the insertion
point 107 in the output text region 104. When no current input sequence exists, a
contact on the Edit Word key 114 causes the system to establish a current input
sequence consisting of the coordinate locations associated with the letters of the
word that contains the insertion point cursor 107 or is immediately to the left of this
cursor in the output text region 104. The result is that this word is "pulled in" to the
system creating a word choice list in which the word appears both as the Default
word 160 and the Exact Type word 154.
A block diagram of the reduced keyboard disambiguating system hardware is
provided in Figure 2. The touch screen 202 and the display 203 are coupled to a
processor 201 through appropriate interfacing circuitry. Optionally, a speaker 204 is
also coupled to the processor. The processor 201 receives input from the touch
screen, and manages all output to the display and speaker. Processor 201 is
coupled to a memory 210. The memory includes a combination of temporary
storage media, such as random access memory (RAM), and permanent storage
media, such as read-only memory (ROM), floppy disks, hard disks, or CD-ROMs.
Memory 210 contains all software routines to govern system operation. Preferably,
the memory contains an operating system 211, auto-correction software 212, and
associated vocabulary modules 213 that are discussed in additional detail below.
Optionally, the memory may contain one or more application programs 214, 215,
216. Examples of application programs include word processors, software
dictionaries, and foreign language translators. Speech synthesis software may also
be provided as an application program, allowing the reduced auto-correcting
keyboard system to function as a communication aid.
In accordance with another aspect of the invention, each input sequence is
processed with reference to one or more vocabulary modules, each of which
contains one or more words together with information about each word including the
number of characters in the word and the relative frequency of occurrence of the

word with respect to other words of the same length. Alternatively, information
regarding the vocabulary module or modules of which a given word is a member is
stored with each word. Each input sequence is processed by summing the
distances calculated from each contact point in the entry sequence to the location
assigned to the letter in the corresponding position of each candidate word, wherein
the distances are calculated according to one of the preferred methods. This total
distance is combined with the frequency information regarding each candidate word
to calculate a matching metric by which the various candidate words are rank
ordered for presentation to the user. In one preferred embodiment, the matching
metric is calculated as follows. The square of the distance from each contact point in
the entry sequence to the location assigned to the letter in the corresponding
position of each candidate word is calculated, and the sum of the squared distances
is calculated for each candidate word. This sum is then multiplied by a frequency
adjustment factor, which in one preferred embodiment is calculated as the base 2
logarithm of the ordinal position of the word in the candidate list, where words of
higher relative frequency are moved "higher" in the list to positions corresponding to
a lower ordinal position (i.e., the most frequent word is at position "1"). Thus, the
lower the numeric value of the calculated matching metric, the more likely a given
word is deemed to correspond to the user"s intention in generating a sequence of
contact points.
In another aspect of the invention, prior to multiplying the sum of the distances (from
each contact point in the entry sequence to each corresponding letter in a candidate
word) by the frequency adjustment factor, a fixed increment is added to the sum so
that it is at least greater than or equal to this increment value. This is done to avoid
calculating a matching metric value of zero (i.e., the most likely match) when the
sequence of contact points happens to correspond exactly to the spelling of a given
word, even when that word occurs with very low frequency (i.e., has a high numeric
ordinal position). This allows much more frequently occurring words to produce a
better matching metric even when an inaccurate sequence of contact points is
entered. In one implementation of this preferred embodiment, it was found that a
fixed increment value of approximately twice the average distance between adjacent

characters in the keyboard was effective in reducing spurious matches with
infrequent words.
In accordance with another aspect of the invention, words in each vocabulary
module are stored such that words are grouped into clusters or files consisting of
words of the same length. Each input sequence is first processed by searching for
the group of words of the same length as the number of inputs in the input
sequence, and identifying those candidate words with the best matching metric
scores. In accordance with another aspect of the invention, if fewer than a threshold
number of candidate words are identified which have the same length as the input
sequence, and which have a matching metric score better than a threshold value,
then the system proceeds to compare the input sequence of N inputs to the first N
letters of each word in the group of words of length N+1. This process continues,
searching groups of progressively longer words and comparing the input sequence
of N inputs to the first N letters of each word in each group until the threshold
number of candidate words are identified. Viable candidate words of a length longer
than the input sequence may thus be offered to the user as possible interpretations
of the input sequence, providing a form of word completion. In another aspect of the
invention, prior to multiplying the sum of the distances (from each contact point in the
entry sequence to each corresponding initial letter in a candidate word whose length
is greater than the length of the current input sequence) by the frequency adjustment
factor, a second fixed increment is added to the sum so that it is greater than the
distance sum that would be calculated for a word whose length corresponds exactly
to the length of the current input sequence. This is done to assign a relatively higher
matching probability to words whose length does correspond exactly. In another
preferred embodiment, this second increment factor is a function of the difference in
length between the candidate word and the current input sequence.
In accordance with another aspect of the invention, in order to increase the efficiency
with which the vocabulary modules can be processed, each character mapped onto
the touch-sensitive pad in the auto-correcting keyboard region is assigned a
boundary of exclusion. Each such boundary identifies the region beyond which the
distance from the contact point to the character will not be calculated and the

character will be removed from consideration for that contact point in the input
sequence, reducing the computation required by the distance calculation process.
The boundaries of exclusion for several characters may share some or all common
boundary segments. Examples of shared boundaries include the extreme edge of
the auto-correcting keyboard region, or gross boundaries drawn through the
character space to subdivide the auto-correcting keyboard into 2, 3 or more major
clustering regions. Conceptually, it is identical to consider the boundary of exclusion
for a given contact point, where any character outside that boundary is excluded
from consideration as a match for that input point. For example, Figure 3 shows an
auto-correcting keyboard region 300 that consists of a horizontal rectangle which is
divided vertically into three clustering regions 301, 302, 303 of approximately equal
size, where these regions are defined such that each character falls into only one of
the three clustering regions. The clustering regions are defined such that for each
contact point in the auto-correcting keyboard region, at least one and frequently two
of the three regions lie completely outside the boundary of exclusion for that contact
point. For example, a contact point 311 at the left side of region 301 is far enough
away from region 302 that all characters in region 302 (and region 303) could be
defined to lie outside the boundary of exclusion for contact point 311. In contrast,
the boundary of exclusion for contact point 312 at the right side of region 301 would
extend into region 302 such that one or more characters in region 302 would be
considered to lie inside the boundary, so that the only region completely outside the
boundary of exclusion for contact point 312 would be region 303. The boundary of
exclusion for contact point 313 in the center of region 302 could be considered to be
far enough away from both region 301 and region 303 that all characters in both
these regions could be defined to lie outside the boundary.
Such clustering regions are then used to increase the efficiency with which the
system can identify the most likely matching words in one or more vocabulary
modules for a given input sequence of contact points. Continuing the example
described above and depicted in Figure 3, the words of a given length in each
vocabulary module can be divided up into nine different sub-groups based on the
clustering regions in which each of the first two letters of each word is found, since
there are nine possible ordered pairs of such regions. Note that processing words of

only one letter need not be optimized since very little calculation is required and
there are only a very small number of one-letter words, even when every letter is
treated as if it is a one-letter "word." For each of the first two contact points, letters in
one or two of the clustering regions can be eliminated from consideration, so that all
of the words in the sub-groups associated with letters in the eliminated regions can
be skipped over without needing to perform any distance calculations. Thus,
assuming a more or less equal distribution of total character frequency among the
three regions for the first two character positions of words in the vocabulary modules,
upon the receipt of the second contact point, the system need only calculate
distances for and compare at most 4/9 of the candidate words (when only one
clustering region is eliminated from consideration for each contact point) to as few as
1/9 of the candidate words (when two clustering regions are eliminated for each
contact point). As would be obvious to one of ordinary skill in the art, this method
can be used with a greater or lesser number of clustering regions, and for different
numbers of initial contact points, with corresponding results. For example, four
clustering regions could be used to divide candidate words into sixteen sub-groups
based on the first two contact points.
In another embodiment of the invention, a subset of characters or functions will be
associated with uniquely defined regions or keys outside the auto-correcting
keyboard, where entries within these regions are interpreted as explicit entries of a
specific character or function, for example, a Space key that unambiguously
generates a single space when selected. For a defined set of such keys, selecting
such a key immediately following an input sequence, and prior to performing an
explicit selection of any of the interpretations offered by the system for the input
sequence, results in the automatic acceptance of the interpretation of the input
sequence deemed to be most likely according to the matching metric calculated for
each candidate word. The input sequence is terminated, so that the next keystroke
inside the auto-correcting keyboard region starts a new input sequence. Once the
desired word interpretation of an input sequence has been determined and the
sequence is terminated, the system automatically outputs the word so that it is
added to the information being constructed. In the case of certain functions, for
example the backspace function, an entry within the associated region is interpreted

as an explicit entry of the backspace function, which is immediately executed. The
result in this case however, does not terminate the input sequence, but simply
deletes the last (most recent) input from the sequence. In general, keys outside the
auto-correcting keyboard are immediately interpreted and acted upon according to
the unique character or function associated with the key. Depending on the
associated character or function, in some cases the current input sequence is
terminated as a result.
In accordance with another aspect of the invention, the system distinguishes
between two different types of contact events that occur in the area of the touch
screen or touch-sensitive display that is used to display the auto-correcting keyboard
region and other uniquely defined regions or keys outside the auto-correcting
keyboard. One type of contact consists of a "tap" event, wherein the touch screen is
contacted and then the contact is terminated without moving beyond a limited
distance from the initial point of contact. This type of event is processed as a
keystroke intended for the reduced auto-correcting keyboard system as described in
this disclosure. The second type of contact consists of a "stroke" event, wherein the
touch screen is contacted then the point of contact is moved in one or more
directions beyond the limited distance threshold used to define a tap event. This
second type of contact can then be processed by using a stroke recognition system
using techniques that are well known in the art. This allows a number of additional
functions or special characters to be made easily accessible to the user without
having to trigger pull-down menus or define additional keys that would either require
additional screen space or reduce the size of the keys provided. The interpretation
of such strokes and the resulting character or function associated with a recognized
stroke is then processed by the system in the same fashion as an activation of one
of the uniquely defined regions or keys outside the auto-correcting keyboard. In this
way, only a limited area of the available touch screen or touch-sensitive display
needs to be used to accommodate both keyboard-based and stroke recognition
input approaches.
In accordance with another aspect of the invention, the system performs additional
processing of "tap" events to dynamically adjust to a particular user"s style of
contacting the touch screen or touch-sensitive display. For a user who contacts the

display with a stylus "gesture" that closely approximates a point (i.e., the stylus
contacts the display and is lifted before being moved any appreciable distance),
there is no significant ambiguity as to where the user intended to contact the
keyboard. However, when the stylus moves to a greater or lesser extent before
being lifted from the display, there is ambiguity as to which point contacted during
the duration of the stylus "gesture" best represents the point that the user intended to
contact - the initial point of contact, the final point where the stylus was lifted, or
some other point along the path of contact of the stylus. In a preferred embodiment,
the system records the path traced out by each contact as a set of N contact points
that include the endpoints of the path of contact and zero or more points equally
spaced points along the path. For example, in an embodiment where N is set to 3,
the set would include the endpoints and the midpoint of the path. Initially, one point
of each set of recorded points is designated as the coordinate to be used to
represent the point of contact in calculating distances to letters in the auto-correcting
keyboard. For example, in a preferred embodiment, the initial point of contact
recorded in each set is designated as the coordinate to be used to represent the
point of contact in all distance calculations. Each time a word is selected for output
from the word choice list, the distance calculation is repeated from each letter in the
chosen word to each of the other sets of recorded points. For example, when N is
set to 3 and the calculation is performed for the starting point of contact, the
calculation is repeated for the set of midpoints and for the set of endpoints.
Whichever set of points results in the minimum calculated distance is then
designated as the set of points whose coordinates are to be used to represent the
sequence points of contact in all subsequent distance calculations in creating the
word choice list for each sequence of contacts. In another preferred embodiment, a
running average is computed of the distance calculations performed for each point
set, and the point set for which this running average is lowest is used for distance
calculations in creating the word choice list. In another preferred embodiment, the
running average is computed of the horizontal and vertical signed offset of the
designated points from the intended target letters, and the coordinates used in
distance calculations for creating the word choice list are adjusted by this average
signed offset, or by a fixed fraction of this offset. Thus, if a user consistently contacts

the touchscreen somewhat to the left and below the intended letters, the system can
automatically adjust and more accurately predict the intended word on average.
In accordance with another aspect of the invention, each character mapped onto the
touch-sensitive pad in the auto-correcting keyboard region is assigned a region of
territory. Each such region identifies an area wherein the distance from the user
entry to the character is assigned the value of zero, simplifying the distance
calculation process. The size of such regions can vary for different characters and
functions. For example, a larger region may be assigned to a character that occurs
with a relatively higher frequency within a representative corpus of usage. In one
embodiment, this region assigned to a character simply corresponds to a defined key
that is clearly circumscribed and demarcated on the touch screen, and to which the
character is assigned.
The operation of the reduced auto-correcting keyboard system is governed by the
auto-correction software 212 which is based in part on the distance between the
contact point and the various candidate characters. In one embodiment of the
invention, each character in the auto-correcting keyboard is assigned a Cartesian
coordinate to simplify the calculation of the distance to keystrokes. The distance
between the contacted point and the various candidate character locations in the
auto-correcting keyboard, therefore, is calculated through simple Cartesian
coordinate distance analysis. In another embodiment of the invention, the square of
the simple Cartesian coordinate distance is used to both simplify calculation
(because no square root need be calculated) and to apply a non-linear weighting to
more distant contact points. In other embodiments, the distance calculation also
utilizes other nonlinear functions such as natural logarithms or discrete steps, either
exclusively or in an appropriately weighted combination with Cartesian coordinate
distance analysis.
Also, in another preferred embodiment the distances in the x and y directions are
weighted differently. Such modifications to the distance calculation can serve to
simplify word selection, reduce processing requirements, or to accommodate
systematic entry anomalies depending on the particular needs of a given system and

its implementation. For example, in the case of a touch screen display panel on
which a QWERTY keyboard arrangement is displayed with three rows of character
keys, it is generally less likely that a significant error will be made in contacting the
keyboard in the wrong row. In this case, vertical distance along the y-axis may be
weighted more heavily than horizontal distance along the x-axis.
Additionally, the spacing between characters on the auto-correcting keyboard may
be non-uniform, depending on how frequently any given character is used in a
representative corpus of the language, or on its location relative to the center or the
edge of the keyboard. Alternatively, when sufficient computational resources are
available, one or more characters may be assigned a plurality of corresponding
coordinate locations to be used as reference points in calculating the distance of the
key from the coordinate location of a point at which the keyboard was contacted,
wherein that distance is calculated as the distance from the contacted point to the
closest such assigned reference coordinate. This will tend to decrease the
calculated distances to points at which the display is contacted in a non-linear
fashion, and consequently increase the size of the region surrounding the character
in which there is a high likelihood that a sequence of contacts that includes a contact
point in the region will match a word with the character in the corresponding position.
Also, the coordinates of the characters may be assigned to locations not shared by
keyboard keys or directly detectable by sensors. This allows the system to be
implemented using less costly touch screens or keyboards having a lower resolution
in detecting points of contact. It also allows the keyboard to be reconfigured
according to the user"s wishes but still utilizing the same physical keyboard touch
screen or sensor array. For example, the common three rows of characters in the
QWERTY layout may be served with 1, 2, 3 or more rows of sensors to reduce the
keyboard"s mechanical complexity or to allow dynamic reassignment of novel
keyboard arrays. An example would be changing from 3 rows of 9 characters to 4
rows of 7 characters. The assigned coordinate location for a given character key
may thus lie between the nearest two or more points at which physical contacts with
the keyboard may be detected and resolved. In this case, the distance from a
detectable contact point and the assigned character location is calculated by

interpolating to a logical coordinate frame with a finer resolution than that of the
physical sensors.
In one preferred embodiment of the system, additional processing optimization is
achieved by setting a limit on how many letters in a given candidate word can be
further away from the corresponding input contact point than a preset threshold
distance (maximum_key_distance). If this preset threshold maximum_key_distance
is set to a value other than MAX_DISTANCE_VALUE (the maximum distance value
that can be calculated by the distance measurement algorithm used in the system),
then a second threshold over max_distance_limit is set to the maximum number of
letters in a given candidate word that can be further than maximum_key_distance
from the corresponding input contact point.
FIGURES 4A through 4K show a flow chart of a preferred embodiment of a main
routine of the auto-correction software 212 that generates and manages a word
choice list to aid the user in efficiently utilizing inaccurate keystroke sequences.
Figure 4A, shows the main processing routine, which when the system is first
started, at block 4105 initializes both the word choice list and the current input
sequence to an empty state. Then, at block 4110, the system waits to receive a
keystroke from the touch screen 202. Upon receipt of a keystroke, at block 4115 the
system determines whether the coordinates x/y of the received keystroke contact
point lie within the boundaries of the auto-correcting keyboard region 106. If not,
then the process indicated in block 4120 is carried out as shown in the flowchart of
Figure 41, wherein the system processes the specific character or function
associated with the defined key region containing contact point x/y. If at block 4115
the received keystroke contact point x/y lies within the boundaries of the auto-
correcting keyboard region 106, then at block 4130 the length k of the sequence is
incremented by one, and the point x/y is appended to the end of the current input
sequence as the Kth input. Then at block 4140, the system sets the key distance
table entries KDik to the squares of the Cartesian distances from the Kth input point
x/y to the nearest point on the perimeter of each key Ki in auto-correcting keyboard,
setting KDik to 0 when x/y is in the interior of key region Ki. At block 4150, for each
possible character Cj that is a valid character appearing in one or more words of the

vocabulary modules 213, a translate table character_map mapping each character
value Cj to its corresponding key Ki is used to set each element CDjk of the Kth row of
the character_distance table to the squared distance KDjk from Kth input x/y to the
key Ki corresponding to each possible character Cj. This allows the distances used
in calculating the matching metric to be calculated only once (when KDjk is set in the
key_distance table), and the translate table character_map is likewise used only
once when the character_distance table is filled in from the key_distance table. This
allows for greater efficiency in the large number of calculations that would otherwise
be repeated in processing the words of the vocabulary modules.
At decision block 4160, the variable maximum_key_distance is checked to determine
whether it is set to a value other than MAX_DISTANCE_VALUE, and if so, at block
4170, an auxiliary index array is sorted so that, in searching the words of the
vocabulary modules, the x/y inputs can be processed in ascending order of the
likelihood of matching a character mapped to a key close to the x/y input. Sorting
the inputs x/y to be processed in this order tends to minimize the total amount of
computation required to process the vocabulary modules for the input sequence,
since this increases the likelihood across all words that one or more x/y inputs will be
greater than maximum_key_distance from the corresponding key before all inputs
have been processed, so that the remaining inputs need not be processed since the
word will be disqualified as a candidate as soon as the number of such inputs
exceeds over_max_distancejimit. Figure 4K shows a preferred embodiment of how
the likelihood of matching a character mapped to a key close to a given x/y input is
calculated. A table character_frequencies is included with the vocabulary modules
wherein element character_frequencies,j contains the sum of the relative frequencies
of all characters found as the jth character of any word in the vocabulary, and which
are mapped in character_map to key Kj. At block 41110, match probabilityk for the
current input x/y is initialized to zero. In loop 41120, at decision block 41130, if key
Ki is no greater than maximum_key_distance from the input x/y, then at block 41140
then match_probabilityk is incremented by the value of character_frequenciesjj
divided by the distance (KDik + 1), where the distance KDjk is incremented by 1 to
avoid division by zero and to scale each character_frequenciesjj appropriately.
When all keys have been processed in loop 41120, then at block 41150, the index

values Ik in array keyjndex are sorted in ascending order according to the values
of match probabilityk that have been calculated for each input.
Returning to Figure 4A, at block 4180, a new word choice list is computed based on
the current input sequence of length k. Figure 4B shows a preferred embodiment for
computing a new word choice list. At block 4210, any previously computed word
choice list is cleared. At block 4220, if current input sequence includes two or more
inputs, the software determines which of the three clustering regions can be
excluded from consideration based on the coordinate locations of the first two inputs
of the sequence. At block 4230, based on the excluded clustering regions, of the
nine possible sub-groups of each word list in the vocabulary modules, the sub-
groups of words which actually need to be processed are identified. Then, in block
4240, only these identified sub-groups are processed in order to identify candidate
words to show in the word choice list.
Figure 4C shows how the words in the identified sub-groups are processed to build a
word choice list of the words that are most likely to match the user"s intention in
entering an input sequence of keystrokes consisting of contact points inside the
auto-correcting keyboard region. Block 4305 defines the limits of the loop from block
4310 through the test at block 4380 for loop termination. Block 4380 tests whether
there are any more words of length k, the current length of the input sequence, that
belong to one of the identified sub-groups, that have not yet been processed. If not,
then at block 4385 the system tests whether the word list has been filled, and
whether the value of the matching metric calculated for each word in the list is less
than a predetermined threshold. If so, then the word list is deemed to have been
filled with potential matches of an appropriate quality, and at block 4395 the
processor returns to block 4260 in Figure 4B. If not, then at block 4390, the system
tests whether there are any more words of any length greater than k, that belong to
one of the identified sub-groups, that have not yet been processed. If not, then at
block 4395 the processor returns to block 4260.
Once the next word to be processed has been obtained from a vocabulary module at
block 4310, at block 4315 word_distance is set to zero so that the weighted distance

from the input sequence to this word can be summed into this variable. Then at
block 4320, over max_distance_count is set to zero so that the number of letters in
the word that are further from the corresponding contact point in the input sequence
than a preset maximum threshold maximum_key_distance to this word can be
counted with this variable. Then at block 4330, the word is processed as shown in
Figure 4D. Block 4410 initializes the loop counter / to 1 and defines the limits of the
loop from block 4420 through the test at block 4490 for loop termination when each
of the k inputs in the current sequence have been processed. At block 4420, the
variable next_key is set to the next index array value key_indexu which was sorted
according to Figure 4J so that inputs are processed starting with those for which the
calculated keyjdistance is most likely to exceed the threshold
maximum_key_distance. The loop counter / is then incremented. At block 4430,
keyjdistance is set to the corresponding value already calculated and stored as
described above in the array CD, which contains the distance from each contact
point in the input sequence to each possible character that occurs in any word of the
vocabulary modules. At decision block 4440, if key_distance exceeds the threshold
maximum_key_distance, then at block 4450 over_max_distance_count is
incremented and at decision block 4455 over_max_distance_count is tested to
determine if the maximum number over_max_distance_limit of such inputs has been
exceeded. If so, loop 4410 is terminated early and the incorrect word distance,
which is then returned at block 4490, is of no consequence since this word is
disqualified from further consideration. If at decision block 4440, keyjdistance does
not exceed the threshold maximum_key_distance, or if at decision block 4455,
over_max_distance_count does not exceed the threshold over_max_distance_limit,
then at block 4460 keyjdistance is summed into the total word_distance being
calculated for the current word. This process is repeated for each contact point in
the input sequence until at decision block 4470 it is determined that all inputs have
been processed. When this process returns from block 4490, either wordjdistance
has been correctly calculated for the current word, or over_max_distance_count
exceeds the threshold over_max_distance_limit, and the current word is disqualified
from further consideration.

Returning to Figure 4C at decision block 4335, over_max_distance_count is tested
to determine whether the current word is disqualified, and if so, execution proceeds
to block 4380 to test whether the word processing loop 4305 should terminate. If
not, at decision block 4340, if the length of the current word is greater than the
number of inputs, then at block 4345 the calculated word_distance is incremented by
a fixed amount wrong_length_additive_factor.. In another preferred embodiment,
wrong_length_additive_factor is calculated as a function of the difference between
the number of letters in the word and the number of contact points in the input
sequence. In either case, processing returns to block 4350 where wordjdistance is
incremented by a fixed amount all_word_additive_factor, to prevent any word from
having a wordjdistance value of zero, so that the match_metric calculated for the
word reflects its relative priority in the vocabulary module"s list. At block 4355, a
multiplicative factor idx_multiplier is calculated to use as a weighting factor in
combination with the calculated wordjdistance to determine the value of
matchjmetric for the word. In the preferred embodiment shown in Figure 4C,
idxjmultiplier is calculated as the bit position of the highest bit set to 1 in a binary
representation of the numeric index of the word"s ordinal position in the list of which it
is a member. This value ranges from 0 to 31, where 0 corresponds to the highest bit
position, and 31 the lowest. In block 4360, this value is incremented by 1 so the
multiplicative factor used is greater than or equal to 1 so that any non-zero
wordjdistance will result in a non-zero matchjmetric value.
If at decision block 4370 the matchjmetric is less than the worst (i.e. highest)
matchjmetric score within the word choice list then the current word is inserted into
the word choice list. If the matchjmetric is greater than or equal to the worst
matchjmetric score within a full word choice list, than the current word is ignored.
Decision block 4380 returns to block 4310 if there are any words left that have not
been processed that are the same length k as the current input sequence. When
decision block 4380 finds no more words to of length k to process, decision block
4385 tests whether the word choice list contains a full complement of matching
words (in one preferred embodiment, a full complement consists of four words), each
of which has a matchjmetric value below a predetermined threshold. If at decision
block 4385 it is found that that the word list does not yet contain a full complement of

matching words, then at block 4390 the system determines whether there are any
words left of length greater than the current input sequence length k, and if so,
execution continues from block 4310. Word testing continues until decision block
4385 finds that the word choice list is filled with matching words, or until decision
block 4390 finds there are no additional words to test.
Returning to Figure 4B, the word choice list is processed at block 4260. Figure 4E
shows a preferred embodiment for processing the word choice list. At block 4510,
the words selected for the word choice list are sorted in ascending order by word
length, so that words whose lengths are equal to the number of keys for the entry
string will be presented as the most likely alternatives within the word choice list. At
block 4520, each group of words of the same length is sorted in ascending order
according the values of match_metric that have been calculated for each word, so
that words with lower values of match_metric are presented as the most likely
alternatives.
Words may be included in the vocabulary modules that are marked as known
misspellings, for example, words in English in which the correct order of the letters "i"
and "e" is commonly reversed. In one preferred embodiment, when such misspelled
words are identified as candidate words from the vocabulary modules and are
included in the word choice list, they are flagged such that they can be replaced in
the word list at block 4540 with the corresponding correctly spelled words. Similarly,
words may also be included in the vocabulary modules that are flagged as macros or
abbreviations that are associated with other strings of text to be output and/or
designated functions to be executed upon selection of the associated word. Such
macros are also replaced in the word choice with the corresponding associated text
strings at block 4540. Block 4560 applies the proper shift states to all characters of
words within the word choice list, transforming the relevant characters into their
proper form of upper case or lower case, according to the shift state that was in
effect at the time the keystroke corresponding to each letter was performed. At block
4580 duplicate words in the word choice list are eliminated by removing the lowest
priority duplicates.

In accordance with another aspect of the invention, a software application
implementing the input method of the present invention is installed in an existing
device. During the installation of this application in the device, existing information
files are scanned for words to be added to the lexicon. Methods for scanning such
information files are well known in the art. As new words are found during scanning,
they are added to the lexicon structure as low frequency words, and as such are
placed at the end of the word lists with which the words are associated. Depending
on the number of times that a given new word is detected during the scanning, it is
assigned a relatively higher and higher priority, by promoting it within its associated
list, increasing the likelihood of the word appearing in the word selection list during
information entry.
In accordance with another aspect of the invention, the lexicon of words has an
appendix of offensive words, paired with similar words of an acceptable nature, such
that entering the offensive word, even through Exact Typing of the locations of the
letters comprising the offensive word, yields only the associated acceptable word in
the Exact Type field, and if appropriate as a suggestion in the Word Selection List.
This feature can filter out the appearance of offensive words which might appear
unintentionally in the selection list once the user learns that it is possible to type
more quickly when less attention is given to contacting the keyboard at the precise
location of the intended letters. Thus, using techniques that are well known in the
art, prior to displaying the Exact Type word string, the software routine responsible
for displaying the word choice list simply compares the current Exact Type string with
the appendix of offensive words, and if a match is found, replaces the display string
with the associated acceptable word. Otherwise, even when an offensive word is
treated as a very low frequency word, it would still appear as the Exact Type word
when each of the letters of the word is directly contacted. Although this is analogous
to accidentally typing an offensive word on a standard keyboard, the system of the
present invention is designed to allow and even encourage the user to type with less
accuracy. This feature can be enabled or disabled by the user, for example, through
a system menu selection.

Those skilled in the art will also recognize that additional vocabulary modules can be
enabled within the computer, for example vocabulary modules containing legal
terms, medical terms, and foreign language terms. Via a system menu, the user can
configure the system so that the additional vocabulary words can be caused to
appear first or last in the list of possible words, with special coloration or highlighting.
Consequently, within the scope of the appended claims, it will be appreciated that
the invention can be practiced otherwise than as specifically described herein.
Returning through Figure 4B to Figure 4A, the word selection list is presented to the
user and the main routine awaits the next keystroke from the touch screen 202 at
block 4110. If, upon receipt of a keystroke, at block 4115 the system determines that
the received keystroke contact point lies outside of the boundaries of the auto-
correcting keyboard region 106, then the process of block 4120 is carried out as
shown in Figure 41. Block 4910 identifies the character or function associated with
the defined region. If at decision block 4920 the word choice list is empty, then block
4925 generates the character(s) associated with the defined key region, or executes
the function associated with the defined key region, and at block 4970 the system
returns to Figure 4A. If one or more words are currently displayed in the word choice
list, decision block 4930 determines if the keystroke x/y coordinate falls within the
word-choice list region 150. If so, at block 4935 the system processes the word
selection from the word-choice list.
In accordance with another aspect of the invention, the user presses a Space key to
delimit an entered keystroke sequence. After receiving the Space key, the
disambiguating system selects the most frequently used word and adds the word to
the information being constructed. The Space key is used to delimit an entered
sequence.
In accordance with another aspect of the invention, the word selection list is
presented as a vertical list of candidate words, with one word presented in each row,
and wherein each row is further subdivided into regions or columns. The regions or
columns define functions related to the acceptance of the candidate string displayed
in the selected row, such as including or not including a trailing blank space,
appending a punctuation mark or applying a diacritic accent. The function may be

applied when the user touches the row of the intended string in the word selection
list at a point contained in the region or column associated with the desired function.
When the user selects the desired candidate word by contacting the row within
certain regions or columns, the word is automatically "accepted" for output and is
added to the information being composed. For example, contacting a row within the
region associated with appending a trailing space immediately outputs the
associated word with a trailing space. In accordance with another aspect of the
invention, one such region or column is defined such that contacting a row within the
region invokes a function which replaces the current input sequence of actual
contact points with a sequence of contact points corresponding to the coordinate
locations of the letters comprising the word in the selected row, but without
terminating the current input sequence. As a result, the selected word appears in
the selection list as the Exact Type interpretation of the input sequence. In most
cases, the selected word also appears as the most likely word interpretation of the
input sequence, although if the letters of the word are each near those of a much
more frequent word, the more frequent word will still appear as the most likely word
interpretation. This ability to re-define the input sequence as the coordinate
locations of the letters of the intended word without terminating the input sequence
enables the user to then continue typing, for example, a desired inflection or suffix to
append to the word. When the intended word is relatively infrequent, and especially
when it is seen only infrequently with the desired inflection or suffix, this feature
makes it easier for the user to type the desired infrequently occurring form of the
infrequent word without needing to carefully type each letter of the word. Only one
additional selection step is required when the uninflected form of the word is selected
by contacting the associated row in the selection list in the region associated with
this feature.
Figure 4J shows a preferred embodiment for processing word-choice list selections,
registering contacts within regions 154, 157, or 160. Block 41010 identifies which
row of the word-choice list was contacted and the associated word. Block 41020
identifies the word-choice list column that was contacted and the associated function
Fcoi for that column. In the preferred embodiment shown in Figure 1B, three different
columns are defined: one to the left of column marker 170, one to the right of column

marker 172, and one between the column markers 170 and 172. Decision block
41030 determines if the function Fcol consists of replacing the input sequence with a
new set of x/y locations of the word selected, which in the preferred embodiment
shown in Figure 1B, corresponds to an x/y location to the right of column marker
172. If so, block 41032 replaces the input sequence with the sequence of x/y
locations corresponding to the characters of the selected word and at block 41034 a
new word choice list is generated as shown in Figure 4B. If function Fcol does not
replace the input sequence, processing of the selected word from the word choice
list continues. Block 41040 adjusts the selected word"s priorities.
In accordance with another aspect of the invention, during use of the system by a
user, the lexicon is automatically modified by a "Promotion Algorithm" which, each
time a word is selected by the user, acts to "promote" that word within the lexicon by
incrementally increasing the relative frequency associated with that word. In one
preferred embodiment, the Promotion Algorithm increases the value of the frequency
associated with the word selected by a relatively large increment, while decreasing
the frequency value of those words passed over by a very small decrement. For a
lexicon in which relative frequency information is indicated by the sequential order in
which words appear in a list, promotions are made by moving the selected word
upward by some fraction of its distance from the head of the list. The Promotion
Algorithm is designed to tend to avoid moving the words most commonly used and
the words very infrequently used very far from their original locations. In one
preferred embodiment, this is achieved by altering the fraction of the remaining
distance by which a selected word is promoted depending on its current relative
position in the overall list. For example, words in the middle range of the list are
promoted by the largest fraction with each selection. Words intermediate between
where the selected word started and finished in the lexicon promotion are effectively
demoted by a value of one. Conservation of the "word list mass" is maintained, so
that the information regarding the relative frequency of the words in the list is
maintained and updated without increasing the storage required for the list.
In accordance with another aspect of the invention, the Promotion Algorithm
operates both to increase the frequency of selected words, and where appropriate,

to decrease the frequency of words that are not selected. For example, in a lexicon
in which relative frequency information is indicated by the sequential order in which
words appear in a list, a selected word which appears at position IDX in the list is
moved to position (IDX/2). Correspondingly, words in the list at positions (IDX/2)
down through (IDX+1) are moved down one position in the list. Words are demoted
in the list when a sequence of contact points is processed and a word selection list is
generated based on the calculated matching metric values, and one or more words
appear in the list prior to the word selected by the user. Words that appear higher in
the selection list but are not selected may be presumed to be assigned an
inappropriately high frequency (i.e., they appear too high in the list). Such a word
that initially appears at position IDX is demoted by, for example, moving it to position
(IDX * 2 + 1). Thus, the more frequent a word is considered to be, the less it is
demoted in the sense that it is moved by a smaller number of steps.
In accordance with another aspect of the invention, the promotion and demotion
processes may be triggered only in response to an action by the user, or may be
performed differently depending on the user"s input. For example, words that appear
higher in a selection list than the word intended by the user are demoted only when
the user selects the intended word by "clicking and dragging" the intended word to
the foremost location within the word selection list, using a stylus or mouse.
Alternatively, the selected word that is manually "dragged" to a higher position in the
selection list may be promoted by a larger than normal factor. For example, the
promoted word is moved from position IDX to position (IDX/3). Many such variations
will be evident to one of ordinary skill in the art.
Figure 4F shows a preferred embodiment for adjusting the prioritization of words
when a word is picked from the word choice list. Decision block 4610 determines if
the selected word choice item is the exact-type word, that string of characters whose
x/y locations happens to correspond exactly to the sequence of contact points, which
in a preferred embodiment is displayed in a distinct location in the word choice list,
such as in Figure IB where the exact-type word 154 ("rwzt" in the example shown) is
separated by a solid line from other words in the list. If the chosen word is not the
exact-type word, such as items 157 or 160, at block 4620 the chosen word is

promoted (as in the preferred embodiment shown in Figure 4G), and at block 4630
each of the words that appeared in the word choice list ahead of the chosen word
are explicitly demoted (as in the preferred embodiment shown in Figure 4H, in
contrast to the incidental demotion that may occurs to one or more words simply as a
consequence of the promotion of another word).
If at block 4610, the chosen word is determined to be the exact-type word, decision
block 4640 identifies if that word is a new word that is not yet included in the
vocabulary modules. If not, then at block 4650 promotes the chosen word is
promoted. If the chosen exact-type word is not yet included in the vocabulary
modules, block 4660 identifies the appropriate word-list to which the word is to be
added. Decision block 4665 identifies if space is available within the appropriate
word-list, And if not, at block 4670 the last, least likely word in the appropriate word-
list is deleted to make room for the word to be added. At block 4675 the new word is
added as the least likely word in the appropriate word-list, then at block 4680 the
newly added word is promoted without explicitly demoting the other words that
appeared in the word choice list.
Figure 4G shows a preferred embodiment of the word promotion performed in blocks
4620, 4650 and 4680. Block 4710 identifies the chosen word"s position within its
word-list, and assigns idx that position value. Block 4720 defines newjdx as one
half of the value of idx, specifying a position in the list halfway from the current
position to the head of the list (the position of the word deemed to be most likely to
be selected). Block 4730 demotes all words in positions between idx and newjdx
by one position, filling the word"s old position at idx and making room for the word at
newjdx. Block 4740 then promotes the chosen word by inserting it back into the list
at position newjdx. Note that this preferred method of promotion essentially has the
effect of decrementing by 1 the idx_multiplier calculated for the word at block 4355.
Figure 4H shows a preferred embodiment of explicit word demotion performed in
block 4635. Block 4810 identifies the explicitly demoted word"s position within its
word-list, and assigns idx that position value. Block 4820 defines newjdx as double
the value of idx plus one. Decision block 4830 compares the value of newjdx to the

total number of words in the word-list. If newjdx is greater than the total number of
words in the word-list, Block 4835 sets newjdx equal to the value of the number of
words in the word-list, since a word can be demoted no further than the end of the
list. Block 4840 promotes all words in positions between idx and newjdx by one
position, filling the word"s old position at idx and making room for the word at
newjdx. Block 4850 then demotes the chosen word by inserting it back into the list
at position newjdx. Note that this preferred method of demotion essentially has the
effect of incrementing by 1 the idx_multiplier calculated for the word at block 4355.
Figures 5A through 5E are schematic views showing a sequence of character inputs
as an illustrative example of entering a word on the preferred embodiment of a
portable computer 102 incorporating a reduced auto-correcting keyboard system 100
formed in accordance with the present invention as shown in Figures 1A and 1B.
Portable computer 102 contains a reduced keyboard 105 implemented on a touch
screen display 103, which is used to generate text to be output to text display region
104.
Figure 5A shows the location 510 of the first keystroke of a sequence of keystrokes
corresponding to the entry of the word "text." In response to the keystroke 501, the
auto-correcting keyboard system displays the word choice list region 150 super-
imposed on top of the text region 104, showing a list of words and other
interpretations corresponding to the keystroke. In this example, the coordinate
location 510 of the keystroke is physically nearest coordinate location associated
with the letter "r." The word choice list includes "R" 511 as the default choice, shown
in the word choice list in the position nearest the auto-correcting keyboard region
106. Since the letter "r", when it occurs as a "word" that is only one letter in length, is
found more frequently in upper case (such as when "R" appears as an initial included
as part of a person"s name), "R" is offered in the word choice list in upper case. This
is in accordance with the aspect of the present invention wherein information
regarding the capitalization of each word is stored along with the word in the
vocabulary modules so that the word can be presented in a preferred form of
capitalization without requiring the user to activate keys (such as a Shift key) to
specify the capitalization of the word entered. The word choice list shows "are" 512

as the next most likely choice, in accordance with the aspect of the present invention
wherein a word or symbol may be associated with an arbitrary sequence of one or
more letters, such that when the associated sequence of letters is entered by the
user, the word or symbol is offered as a choice in the word choice list. In this
example, the word "are" is associated as a "macro" expansion of the single letter "r"
which is pronounced the same in English. Similarly, the word choice list shows "®"
513 as the third most likely choice, where this symbol has been included in the
vocabulary modules based on the logical association with the letter "r." The word
choice list shows "a" 514 as the fourth most likely choice, where "a" is a very
commonly occurring word of one letter, so that it appears as a candidate in the word
choice list even though the coordinate location associated with the letter "a" is
relatively distant from contact location 501. Above these choices is the exact type
region displaying "r" 515 as an option for selection, since the coordinate location
associated with the letter "r" is closer than that of any other letter to coordinate
location 510 of the keystroke.
Figure 5B shows the location 520 of the next keystroke, nearest to the coordinate
location associated with the letter "w." The word choice list includes "re" 521 as the
default choice, "Re?" 522 as the next most likely choice, "ra" 523 as the third most
likely choice and "Rs" 524 as the fourth most likely choice. Above these choices is
the exact type region displaying "rw" 525 as an option for selection.
Figure 5C shows the location 530 of the next keystroke, nearest to the coordinate
location associated with the letter "z." The word choice list includes "tax" 531 as the
default choice, "Rex" 532 as the next most likely choice, "fax" 533 as the third most
likely choice and "was" 534 as the fourth most likely choice. Above these choices is
the exact type region displaying "rwz" 535 as an option for selection.
Figure 5D shows the location 540 of the next keystroke, very near the coordinate
location associated with the letter "t." The word choice list includes "text" 541 as the
default choice, "year" 542 as the next most likely choice, "rest" 543 as the third most
likely choice and "fact" 544 as the fourth most likely choice. Above these choices is

the exact type region displaying "rwzt" 545 as an option for selection. The word "text"
is to be entered as the next word.
Figure 5E shows the next keystroke at 550, in the region designated as the "space"
key. The space key is outside of the auto-correcting keyboard region 106, and thus
can be unambiguously associated with a specific function. The space key acts to
accept the default word "text" 541 and enters the word "text" 542 in the text output
region 104 at the insertion point 107 in the text being generated where the cursor
was last positioned. Simultaneously, the current input sequence is cleared, and the
word choice list display is removed from the display screen 103 of the portable
computer 102 so that the text output region 104 is unobscured.
While the preferred embodiment of the invention has been illustrated and described,
it will be appreciated that various changes can be made therein without departing
from the spirit and scope of the invention. For example, those skilled in the art will
appreciate that the keyboard 105 and its auto-correcting keyboard region 106 may
be configured in various ways, and may have a varying number of explicit function
keys 108 - 122. The auto-correction technique disclosed herein is equally applicable
to keyboards of different sizes, and to traditional mechanical keyboards of various
sizes as well as touch-panel and touch-screen based keyboards such as the one
described in the preferred embodiment. The specific format of the word choice list
150, such as the number of word choices presented, the arrangement of the word
choices, and the functions associated with different areas of the word choice list may
be changed. For example, those skilled in the art will appreciate that the function
that consists of replacing the input sequence with a new set of x/y locations of the
word selected could be omitted in certain applications. Furthermore, the specific
algorithms used in promoting and demoting words within the vocabulary modules
could also be altered. For example, a selected word could be promoted by moving it
% of the distance to the head of its list rather than the factor of 1/2 used in the
preferred embodiment described above.
Although the invention is described herein with reference to the preferred
embodiment, one skilled in the art will readily appreciate that other applications may

be substituted for those set forth herein without departing from the spirit and scope of
the present invention. Accordingly, the invention should only be limited by the
Claims included below.
1. A text entry system comprising:
(a) a user input device comprising an(auto-correcting keyboardjregion .
comprising a plurality of the characters of an alphabet, wherein each of the plurality
of characters corresponds to a location with known coordinates in the auto-correcting
keyboard region, wherein each time a user interacts with the user input device within
the auto-correcting keyboard region, a location associated with the user interaction is
determined and the determined interaction location is added to a current input
sequence of contact locations;
(b) a memory containing a plurality of objects, wherein each object is
further associated with a promotion value, and wherein each of the plurality of
objects in memory is further associated with one or a plurality of predefined
groupings of objects;
(c) an output device with a text display area; and
(d) a processor coupled to the user input device, memory, and output
device, said processor comprising:
(i) a distance value calculation component which, for each
determined interaction location in the input sequence of interactions,
calculates a set of distance values between the interaction locations and the
known coordinate locations corresponding to one or a plurality of characters
within the auto-correcting keyboard region;
(ii) a word evaluation component which, for each generated input
sequence, identifies one or a plurality of candidate objects in memory, and for
each of the one or a plurality of identified candidate objects, evaluates each
identified candidate object by calculating a matching metric based on the
calculated distance values and the promotion value associated with the
object, and ranks the evaluated candidate objects based on the calculated
matching metric values;
(iii) a selection component for identifying one or a plurality of
candidate objects according to their evaluated ranking, presenting the
identified objects to the user, and enabling the user to select one of the
presented objects for output to the text display area on the output device; and
(iv) a promotion component for setting a relativepomotion value

associated with each object in memory as a function of the user setting
interaction with said plurality of objects.
2. The system of Claim 1, wherein the promotion value associated with each
object in memory comprises the ordinal ranking of the object with respect to other
objects in memory, wherein an object associated with a higher promotion value
corresponds to a numerically lower ordinal ranking, and wherein when an object is
selected for output by the user, the promotion component adjusts the ordinal ranking
associated with said selected object by an amount that is a function of the ordinal
ranking of said object prior to said adjustment.
3. The system of Claim 1, wherein when an object is selected by the user for
output to the text display area on the output device, the promotion component
increases the promotion value associated with the selected object by a relatively
large increment, and decreases by a relatively small decrement the promotion value
associated with unselected objects that are associated with the same grouping as
the selected object.
4. A text entry system comprising:
(a) a user input device comprising an auto-correcting keyboard region
comprising a plurality of the characters of an alphabet, wherein each of the plurality
of characters corresponds to a location with known coordinates in the auto-correcting
keyboard region, wherein each time a user interacts with the user input device within
the auto-correcting keyboard region, a location associated with the user interaction is
determined and the determined interaction location is added to a current input
sequence of interaction locations;
(b) a memory containing a plurality of objects, wherein each object is
further associated with a promotion value, and wherein each of the plurality of
objects in memory is further associated with one or a plurality of predefined
groupings of objects;
(c) an output device with a text display area; and
(d) a processor coupled to the user input device, memory, and output

device, said processor comprising:
(i) a distance value calculation component which, for each
generated key activation event location in the input sequence of key activation
events, calculates a set of distance values between the key activation event
location and the known coordinate locations corresponding to one or a
plurality of keys within the auto-correcting keyboard region;
(ii) a word evaluation component which, for each generated input
sequence, identifies one or a plurality of candidate objects in memory, and for
each of the one or a plurality of identified candidate objects, evaluates each
identified candidate object by calculating a matching metric based on the
calculated distance values and the promotion value associated with the
object, and ranks the evaluated candidate objects based on the calculated
matching metric values;
(iii) a selection component for identifying one or a plurality of
candidate objects according to their evaluated ranking, presenting the
identified objects to the user, and enabling the user to select one of the
presented objects for output to the text display area on the output device; and
(iv) a promotion component for, setting a relative promotion value
associated with each object in memory.
5. A text entry system comprising:
(a) a user input device comprising an auto-correcting keyboard region
comprising a plurality of the characters of an alphabet, wherein each of the plurality
of characters corresponds to a location with known coordinates in the auto-correcting
keyboard region, wherein each time a user interacts with the user input device within
the auto-correcting keyboard region, a location associated with the user interaction is
determined and the determined interaction location is added to a current input
sequence of contact locations;
(b) a memory containing a plurality of objects, wherein each object is a
string of one or a plurality of characters forming a word or a part of a word, wherein
each object is further associated with a frequency of use;
(c) an output device with a text display area; and

(d) a processor coupled to the user input device, memory, and output
device, said processor comprising:
(i) a distance value calculation component which, for each
determined interaction location in the input sequence of interactions, calculates a set
of distance values between the interaction locations and the known coordinate
locations corresponding to one or a plurality of characters within the auto-correcting
keyboard region;
(ii) a word evaluation component which, for each generated input
sequence, identifies one or a plurality of candidate objects in memory, and for each
of the one or a plurality of identified candidate objects, evaluates each identified
candidate object by calculating a matching metric based on the calculated distance
values and the frequency of use associated with the object, and ranks the evaluated
candidate objects based on the calculated matching metric values; and
(iii) a selection component for identifying one or a plurality of
candidate objects according to their evaluated ranking, presenting the identified
objects to the user, and enabling the user to select one of the presented objects for
output to the text display area on the output device.
6. The system of Claim 5, wherein the word evaluation component calculates the
matching metric for each candidate object by summing the distance values
calculated from each interaction location in the input sequence to the location
assigned to the character in the corresponding position of the candidate object, and
applying a weighting function according to the frequency of use associated with the
object.
7. The system of Claim 6, wherein each character of the alphabet associated
with the auto-correcting keyboard region is assigned a Cartesian coordinate and
wherein the distance value calculation component calculates the distance between
the interaction location and the location corresponding to a character according to
standard Cartesian coordinate distance analysis.
8. The system of Claim 6, wherein the frequency of use associated with each
candidate object in memory comprises the ordinal ranking of the object with respect

to other objects in memory, wherein an object associated with a higher relative
frequency corresponds to a numerically lower ordinal ranking.
9. The system of Claim 6, wherein the word evaluation component adds an
increment value to the sum of the distance values prior to applying a weighting
function according to the frequency of use associated with the candidate object.
10. The system of Claim 5, wherein the word evaluation component calculates a
matching metric for each candidate object by summing the distance values
calculated from each interaction location in the input sequence to the location
assigned to the character in the corresponding position of the candidate object, and
applying a weighting function according to the frequency of use associated with the
object.
11. The system of Claim 5, wherein the selection component presents the
identified one or a plurality of candidate objects for selection by the user in a
candidate object list in the text display area.
12. The system of Claim 5, wherein a user selection of a character that is
associated with a an interaction outside of the auto-correcting keyboard region
accepts and outputs the determined highest ranked candidate object at a text
insertion point in the text display area prior to outputting the selected character at the
text insertion point in the text display area.
13. The system of Claim 5, wherein user selection of an object for output at a text
insertion point in the text display area terminates the current input sequence such
that the next interaction within the auto-correcting keyboard region starts a new input
sequence.
14. The system of Claim 5, wherein the word evaluation component determines,
for each determined interaction location in each input sequence of interaction
locations, the closest known location corresponding to a character, and constructs
an exact typing object composed of said determined corresponding characters in the

order corresponding to the input sequence of interaction locations.
15. The system of Claim 5, wherein the selection component identifies the highest
ranked candidate object and presents the identified object at the text insertion point
in the text display area on the output device.
16. The system of Claim 5, wherein the processor further comprises a stroke
recognition component that determines for each user interaction within the auto-
correcting keyboard region whether the point of interactionis moved less than a
threshold distance from the initial interaction location, and whereby
when the point of interaction is moved less than a threshold distance from the
initial interaction location, the stroke recognition component determines that the user
interaction is a tap interaction, and the location determined to be associated with the
user interaction is added to the current input sequence of interactionlocations to be
processed by the distance value calculation component, the word evaluation
component, and the selection component, and whereby
when the point of interactionis moved greater than or equal to a threshold
distance from the initial interaction location, the stroke recognition component
determines that the user interaction is one of a plurality of stroke interaction that are
associated with known system functions, and classifies the stroke interactionas one
of the plurality of predefined types of stroke interactions.
17. The system of Claim 5, wherein when a threshold number of interaction
locations in the input sequence are further than a threshold maximum distance from
the corresponding character in the sequence of characters comprising a given
candidate object, said object is identified as no longer being a candidate object for
the selection component.
18. The system of Claim 5, wherein the processor further comprises a frequency
promotion component for adjusting the frequency of use associated with each object
in memory as a function of the number of times the object is selected by the user for
output to the text display area on the output device.

19. A text entry system, substantially as herein
described, particularly with reference to
the accompanying drawings.
There is disclosed an enhanced text entry system which uses word-level analysis to
automatically correct inaccuracies in user keystroke entries on reduced keyboards
such as those implemented on a touch-sensitive panel or display screen, or on
mechanical keyboard systems. A method and system are defined which determine
one or more alternate textual interpretations of each sequence of inputs detected
within a designated auto-correcting keyboard region. The actual contact locations
for the keystrokes may occur outside the boundaries of the specific keyboard key
regions associated with the actual characters of the word interpretations proposed or
offered for selection, where the distance from each contact location to each
corresponding intended character may in general increase with the expected
frequency of the intended word in the language or in a particular context. Likewise,
in a mechanical keyboard system, the keys actuated may differ from the keys
actually associated with the letters of the word interpretations. Each such sequence
corresponds to a complete word, and the user can easily select the intended word
from among the generated interpretations. Additionally, when the system cannot
identify a sufficient number of likely word interpretation candidates of the same
length as the input sequence, candidates are identified whose initial letters
correspond to a likely interpretation of the input sequence. The approach utilizes the
information contained in the entire sequence of keystrokes corresponding to a word
in order to determine the user"s likely intention for each character of the sequence.
The system also accommodates punctuation characters such as hyphens or
apostrophes that are commonly embedded in words such as hyphenated
compounds and contractions in English, and characters with special diacritics such
as are commonly found in various European languages, e.g., diacritic accent.
Special functions may be applied depending on where the user touches the intended
string in a displayed word selection list. Once the user selects the desired string, it is
automatically "accepted" for output and the next input detected starts a new input
sequence corresponding to the entry of a next word.

Documents:

280-kol-2004-granted-abstract.pdf

280-kol-2004-granted-assignment.pdf

280-kol-2004-granted-claims.pdf

280-kol-2004-granted-correspondence.pdf

280-kol-2004-granted-description (complete).pdf

280-kol-2004-granted-drawings.pdf

280-kol-2004-granted-form 1.pdf

280-kol-2004-granted-form 18.pdf

280-kol-2004-granted-form 2.pdf

280-kol-2004-granted-form 3.pdf

280-kol-2004-granted-form 5.pdf

280-kol-2004-granted-gpa.pdf

280-kol-2004-granted-letter patent.pdf

280-kol-2004-granted-reply to examination report.pdf

280-kol-2004-granted-specification.pdf

280-kol-2004-granted-translated copy of priority document.pdf

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Patent Number

212592

Indian Patent Application Number

280/KOL/2004

PG Journal Number

49/2007

Publication Date

07-Dec-2007

Grant Date

04-Dec-2007

Date of Filing

28-May-2004

Name of Patentee

AMERICA ONLINE INC.

Applicant Address

22000 AOL WAY, DULLES, VA 20166, UNITED STATES AMERICA.

Inventors:

#	Inventor's Name	Inventor's Address
1	ROBINSON BALEX	22126-270TH AVENUE SE ,MAPLE VALLEY, WA 98038, USA.

PCT International Classification Number

G09G 5/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10/775,483	2004-02-09	U.S.A.