Title of Invention

"REPRODUCING APPARATUS ADAPTED FOR REPRODUCING A DISC-SHAPED RECORDING MEDIUM"

Abstract Reproducing apparatus adapted for reproducing a disc-shaped recording medium (1) having a program area in which digital data having a header data (H), main data (M) and sub data (S) arranged in blocks (BL), the blocks (BL) being recorded with a variable number of sectors (Bs), are recorded, each sector (Bs) being of pre-set length and including header data (H), main data (M) and sub-data (S), and a management area in which an identifier is recorded for discriminating the variable number of sectors (Bs) in order to render the data volume of the sub-data (S) in the blocks (Bs) variable with the volume of the main data (M) on the blocks (BL) remaining fixed, said reproducing apparatus characterized in that it is provided with the following elements: reproducing means (11) for reproducing the digital data having the main data and the sub data from said program area and the identifier from said management area; separating means (19) for separating the main data and the sub-data from the digital data reproduced by said reproducing means (11) from the program area of the disc-shaped recording medium (1); and control means (23) for controlling said separating means based on said identifier that is reproduced from said management area of said disc shaped recording medium (1) by said reproducing means.
Full Text BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
This invention relates to a disc-shaped recording medium comprising: a
program area; and a management area; characterized in that digital data in
the program area is made up of a header data (H), main data (M) and sub-data
(S) arranged in blocks (BL), the blocks (BL) being recorded with a variable
number of sectors (Bs), each sector (Bs) being of a pre-set length and including
header data (H), main data (M) and sub-data (S); and an identifier is recorded
in the management area for discriminating the variable number of sectors (Bs)
in order to render the data volume of the sub-data (S) in the blocks (Bs)
variable with the volume of the main data (M) in the blocks (BL) remaining
fixed.
Description of the Related Art
In a conventional recording medium, there is provided, in distinction
from a region for recording main data signals, a recording region for sub-data
signals read out simultaneously with the main data signals. These sub-data
signals, also termed sub-data or sub-codes, are used for recording the
ancillary information, such as graphics information or text data.
In a compact disc (CD, registered trade mark), for example, there is
provided, in distinction from the region for recording audio signal data, a
region for recording sub-data that can be reproduced simultaneously as the
audio signals are reproduced. These sub-data include letters, graphics, etc in
addition to the information such as the numbers of musical numbers, indexes
or playing time. In CD-G (CD-graphics), for example, the graphics information
is recorded in six bits termed user bits of the sub-
data so that a picture or a lyric is displayed simultaneously with the
accompaniment (karaoke).
Meanwhile, since the data transfer speed of sub-data is of the order of
several kBps, such as 5.4 kBps (kilobyte per second), the graphics information
that can be recorded as sub-data cannot be expected to be of a high quality.
This is far below 64 kBps require for so-called streaming reproduction on the
Internet now in popular use world-wide. Insofar as the still picture is
concerned, the data transfer rate for displaying the high-quality still picture,
encoded by the JPEG (Joint Photographic Experts Group) format or the GIF
(graphics interchange format) now in popular use, cannot be met.
In order to cope with the streaming reproduction or high-quality still
picture, a high transfer rate exceeding 64 kBps for ancillary data is required.
However, for realizing the high transfer rate, it is necessary to provide a region for
a large amount of the ancillary information needs, as a result of which the main
data region is decreased. If the main data region is decreased, the net result is the
decreased music reproducing time or the lowered sound quality.
Accordingly, the present invention provides A process for recording data in a discshaped
recording medium comprising: a program area; and a management area;
characterized in that digital data in the program area is made up of a. header data (H),
main data (M) and sub-data (S) arranged in blocks (BL), the blocks (BL) being recorded
with a variable number of sectors (Bs), each sector (Bs) being of a pre-set length and
including header data (H), main data (M) and sub-data (S); and an identifier is
recorded in the management area for discriminating the variable number of sectors
(Bs) in order to render the data volume of the sub-data (S) in the blocks (Bs) variable
with the volume of the main data (M) in the blocks (BL) remaining fixed.
Accordingly, there is also provided a reproducing apparatus adapted for reproducing
a disc-shaped recording medium (1) having a program area in which digital data
having a header data (H), main data (M) and sub data (S) arranged in blocks (BL), the
blocks (BL) being recorded with a variable number of sectors (BS), are recorded, each
sector (BS) being of pre-set length and including header data (H), main data (M) and
sub-data (S), and a management area in which an identifier is recorded for
discriminating the variable number of sectors (BS) in order to render the data volume
of the sub-data (S) in the blocks (BS) variable with the volume of the main data (M) on
the blocks (BL) remaining fixed, said reproducing apparatus characterized in that it is
provided with the following elements: reproducing means (11) for reproducing the
digital data having the main data and the sub data from said program area and the
identifier from said management area; separating means (19) for separating the main
data and the sub-data from the digital data reproduced by said reproducing means
(11) from the program area of the disc-shaped recording medium (1); and control
means (23) for controlling said separating means based on said identifier that is
reproduced from said management area of said disc shaped recording medium (1) by
said reproducing means.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a recording medium in
which a transfer rate at least higher than the transfer rate for sub-data of a
conventional compact disc is assured and a higher transfer rate can be variably
assured, and a reproducing apparatus in which the sub-data transfer rate can be
variably switched when reproducing this recording medium.
In one aspect, the present invention provides a recording medium including a
program area in which digital data made up of a header, main data and sub-data is
blocked and recorded with a variable number of sectors, with a unit sector being of a
pre-set data length, and a management area in which there is recorded an identifier for
discriminating the variable number of sectors in order to render the data volume of the
sub-data variable with the volume of main data in the packet remaining fixed.
In another aspect, the present invention provides a recording/reproducing
apparatus for reproducing a recording medium having a program area in which digital
data made up of a header, main data and sub-data is blocked and recorded with a
variable number of sectors, with a unit sector being of a pre-set data length, and a
management area having recorded therein an identifier for discriminating the variable
number of sectors in order to render the data volume of the sub-data variable with the
volume of main data in the packet remaining fixed. Specifically, the
recording/reproducing apparatus includes reproducing means for reproducing the
digital data recorded in the program area and the identifier recorded in the
management area, separating means for separating the main data and the sub-data
from the digital data reproduced by the reproducing means from the program area of
the recording medium, and control means for controlling the separating means based
on the identifier that is reproduced from the management area of the recording
medium by the reproducing means and which is used for identifying the variable
number of sectors.
The recording medium of the present invention, as described above, has a
transfer rate at least higher than the sub-data transfer rate of the conventional compact
disc and is able to secure a higher variable transfer rate. Moreover, the reproducing
device according to the present invention is able to variably switch the sub-rate
transfer rate at the time of reproducing this recording medium.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view showing a double-layer disc embodying the present
invention.
Fig.2A shows a data structure of a standard mode in which the number of
sectors per unit frame is 14/3 (sectors/frame).
Fig.2B shows a data structure of an extension mode in which the number of
sectors per unit frame is 16/3 (sectors/frame).
Fig.3 shows a detailed data structure of the standard mode shown in Fig.2A.
Fig.4 shows a more detailed data structure of the extension, mode shown in
Fig.2B.
Fig. 5 A shows a structure of data recorded on a CD layer 101 shown in Fig.l.
Fig.SB shows a structure of data recorded on a HD layer 102 shown in Fig.l.
Fig.6Ashows a structure of data recorded on the HD layer 102 shown in Fig. 1.
Fig.6B shows a more detailed data structure of a data zone shown in Fig.6A.
Fig.6C shows a more detailed data structure of an audio area shown in Fig.6B.
Fig.6D shows a more detailed data structure of an audio track shown in Fig.6C.
Fig.7 is a block diagram of a reproducing apparatus embodying the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Fig. 1 shows the structure of a multi-layered disc applied to a reproducing device
according to an embodiment of the present invention. The multi-layered disc is an
optical disc having a diameter of approximately 12 cm and a thickness of 1.2 mm and
has a layered structure made up of a label surface 105 on the upper surface, a CD layer
101, a CD substrate 103, a high-density (HD) layer 102, a HD substrate 104 and aread
surface 106.
As may be seen from the above-described structure, the two layers of the CD
layer 101 and the HD layer 102 are formed to serve as the recording layers. On the
CD layer 101 are recorded 16-bit digital audio signals, sampled at 44.1 kHz, as in the
case of the CD, whereas, on the other layer, that is on the HD layer 102, there are
recorded 1-bit digital audio signals, Amodulated at 2.842 MHz, which is an
extremely high sampling frequency as high as 16 times the above-mentioned 44.1 kHz.
As for the frequency range, the CD layer 101 has a frequency range of 5 to 20
kHz, while the HD layer 102 is able to realize a broad frequency range of from the dc
component to 100 kHz.
As for the dynamic range, the CD layer 101 can realize 98 dB for the entire
mdio range, whereas the HD layer 102 can realize the frequency range of 120 dB for
the entire audio range.
The minimum pit length of the CD layer 101 is 0.83 m, whereas that of the HD
layer 102 is 0.4 u.m.
The track pitch of the CD layer 101 is 1.6 m, whereas that of the HD layer 102
is 0.74 yum.
The read-out laser wavelength of the CD layer 101 is 780 nm, whereas that of
the HD layer 102 is shorter and is 650 nm.
The numerical aperture NA of the lens of the optical pickup is 0.45 and 0.6 for
the CD layer 101 and for the HD layer 102, respectively. ,
By varying the minimum pit length, track pitch, numerical aperture of the lens
and the laser wavelength in this manner, the data capacity of the HD layer 102 can be
set to as high as 4.7 GB in comparison with the data capacity of the CD layer 101 of
780 MB.
The Amodulated 64 Fs,l bit audio signals, recorded on the HD layer 102, are
hereinafter termed high-speed 1-bit audio signals.
Since the digital signals of the same recording configuration as that of the
single-layer compact disc, currently on sale, are recorded on one of the layers of the
double-layer disc, while digital signals of the recording configuration, higher in quality
than the single-layer compact disc, currently on sale, are recorded on the other layer,
at least the CD layer 101 can be reproduced by a CD player, now on sale world-wide,
while both the CD layer 101 and the HD layer 102 can be reproduced by a
reproducing device designed to cope with the HD layer.
The reproducing device adapted to cope with the HD layer is able to reproduce
the single-layer compact disc currently on sale.
Two channels of the above-mentioned high-speed 1-bot audio signals (64Fs, 1
bit, Fs being 44.1 kHz) correspond to 705600 bytes (705.6 kB) per second, such that,
if one second corresponds to 75 frames, each frame corresponds to 9408 bytes. Thus,
for recording 3-frame signals, 28224 bytes are required, whereas, for recording main
data using sectors each made up of 2048 bytes, 14 sectors (28672 bytes)or more
suffice.
According to the present invention, the recording capacity per unit time of
supplementary data (sub-data) recording the ancillary information such as graphics
information is changed without changing the quality of the audio signals recorded as
main data.
Specifically, such a mode in which the number of sectors is set to 14 is set as the
standard mode, and the recording capacity of 448 (=28672 - 28224) excluding the
main data M is utilized along with the header H as sub-data S.
Also, such a mode in which the number of sectors is set to 16 is set as an
extension mode, and a recording capacity of 4544 (=32768 - 28224) bytes excluding
the main data M having a fixed data volume (= 28224 bytes) is utilized along with the
header H as the sub-data S.
Fig.2A and 2B show large-unit block data BL, comprised of plural layers of
small-unit blocks.Bs, for the standard mode recording and for the extension mode
recording, respectively. Each small-unit block Bs is comprised of a header H, sub-data
S and main data M recorded on the data zone 2 of the optical disc shown in Fig.SB.
With this optical disc, the data volume of the main data M in the small-unit
block Bs is fixed, whereas the numbers of sectors of the small unit blocks Bs is
rendered variable, such as 14 sectors and 16 sectors, in terms of a large-unit block BL
as a unit, whereby the data volume of the sub-data S is rendered variable, as shown in
Figs.2A and 2B.
To summarize, the large-unit block BL recorded in the data zone in the standard
mode is made up of 14 sectors, as shown in Fig.2 A, each sector being made up of 2048
bytes. The sector-based data volume of the main data M in each small-unit block Bs
is 2016 bytes of the above-mentioned 2048 bytes. Therefore, the data volume of the
main data M in the large-unit block BL of the standard mode is 2016 x 14 = 28224
bytes. The data volume of 28224 bytes are evenly distributed in three frames Fl, F2
and F3 of the above-mentioned three small-unit block Bs so that 9408 bytes are
allocated to the three frames.
The large-unit block BL, recorded in the data zone by the extension mode, is
made up of 16 sectors, as shown in Fig.2B. The data volume of the sector-based main
data M in each small-unit block Bs is 1764 bytes of the 2048 bytes. Since each sector
is made up of 2048 bytes, the main data volume of the large-unit block BL with the
extension mode is 1764 x 16 = 28224 bytes, which is the same as that of the standard
mode. The data volume of 28224 bytes of the main data M is similarly distributed
evenly to the three frames Fl to F3 of the small-unit block Bs so that 9408 bytes each
are allocated to the frames Fl to F3.
On the other hand, the data volume of the sub-data S is larger in the large-unit

block BL in the extension mode by a difference between the number of sectors of the
large-unit block BL in the standard mode and the number of sectors of the large-unit
block BL in the extension mode, that is two sectors (2048 x 2=) 4096 bytes. In
actuality, the number of regular headers H is also increased by two and the data
volume of 10 bytes are allocated to the headers H. so that the increased data volume,
is 4086 bytes.
Figs.3 and 4 show the detailed fonnats of the large-unit block BL in the abovementioned
standard mode and extension mode, respectively.
In Fig. 3, the first frame Fl in the first small-unit block Bs is constituted by bytes
from the leading end of the main data of the sector 1 to the 1344th byte of the main
data of the sector 5. That is, in the first frame Fl of the main data M, the data volume
of 9408 bytes is divisionally recorded in the sector 1 to 1344th bytes in the sector 5.
The data volume of the header H of the first small-unit block Bs is larger by 3 bytes
than the header (5 bytes) of the other sector in the same small-unit block Bs, that is 8
bytes. The data volume of the header H will be explained subsequently. Since the
header of the sector 1 is larger in volume by three bytes than the other header, the subdata
of the sector 1 is lesser by 3 bytes than 27 bytes of the data volume of the other
sub-data , or is 24 bytes. The reason is that the header plus sub-data is fixed, as shown
in Fig.2 A.
The second frame F2 of the second small-unit block Bs in Fig. 3 is made up of
672 bytes as from the 1345th byte of the main data of the sector 5 up to the 672nd byte
of the main data of the sector 10. That is, in the second frame F2 of the main data, the
data volume of the 9408 bytes is divisionally recorded in 672 bytes of the sector 5,
2016x 4 (= 8064) bytes of the sectors 6 to 9 and 672 bytes of the sector 10. As for the
data volume of the second header H, since the leading sector 5 of the small-unit block
Bs is in need of data representing the time code indicative of the beginning of the
frame in the main data, sub-data and two main data, totalling three packets, the data
volume of the second header H is 10 bytes, which is more than 8 bytes of the header
of the sector 1 which is in need of the data volume for the sub-data and one main data
totalling two packets and the time code indicative of the beginning of the frame. Since
the header of the sector 5 is more by 5 bytes than the other headers (5 bytes), the subdata
of the sector 5 is 22 bytes, which is less by 5 bytes than the data volume of 27
bytes of the other sub-data.
The third frame F3 of the third small-unit block Bs in Fig. 3 is made up of data
from the remaining 1344 bytes as from the 673rd byte of the main data of the sector
10 up to the end of the main data of the sector 14. That is, the third frame F3 of the
main data divisionally records the 9408 byte data volume in 1344 bytes of the sector
10 and 2016x 4 (= 8064) bytes of from the sector 11 to the sector 14. The data
Volume
of the header H of the small-unit block Bs is 10 bytes since it is in need of data
representing the time code indicative of the beginning of the frame in the main data,
sub-data and two main data, totalling three packets. Since the header of the sector 10
is more by 5 bytes than the other headers (5 bytes), the sub-data of the sector 10 is 22
bytes which is lesser by 5 bytes than the 27 bytes of the data volume of the other subdata,
as in the second small-unit block Bs.
Thus, with the large-unit block BL of the standard mode shown in Fig.3, the
sum of the main data M of the three frames is set to 28224 byes, while the sum of the
sub-data S is set to 365 bytes.
In Fig.4, the first frame Fl in the first small-unit block Bs is made up of data
from the beginning end of the main data of the sector 1 up to the 588th byte of the
main data of the sector 6. That is, the first frame Fl of the main data has the data
volume of 9408 bytes by the sum of data up to the 588th byte of the sector 6. That is,
the first frame Fl of the main data has the data volume of 9408 bytes as the sum total
up to the 588th byte of the sector 6. On the other hand, the data volume of the header
H in the first small-unit block Bs is 8 bytes which is larger than the header of the other
sectors in the same small-unit block Bs by 3 bytes, that is in an amount corresponding
to the time code indicative of the frame beginning in the main data. Since the header
of the sector 1 is larger by 3 bytes than the other headers, the sub-data of the sector 1
is 276 bytes which is lesser by 3 bytes than the data volume of 279 bytes of the other
sub-data since the header plus sub-data is of a fixed volume as indicated in Fig.2B.
On the other hand, the second frame F2 in the second small-unit block Bs in
Fig.4 is constituted by the remaining 1176 bytes as from the 589th byte of the main
data of the sector 6 up to the 1176th byte of mam data of the sector 11. That is, the
second frame F2 of the main data divisionally records the data volume of 9408 bytes
in 1176 bytes of the sector 6, 1764 x4 (—7056) bytes from the sector 7 to the sector 10
and 1176 bytes of the sector 11. Also, the header H of the second small-unit block Bs
is in need of a data volume indicating a time code indicative of the frame beginning in
the main data, and three packets for sub-data and for two main data, so that the data
volume of the header H is 10 bytes larger by two bytes than 8 bytes of the header of
the sector 1 which is in need of the data volume for two packets for the sub-data and
one main data and the time code indicative of the frame beginning. Since the header
of the sector 6 is larger by 5 bytes than the other header (5 bytes), the sub-data of the
sector 6 is 274 bytes which is smaller by 5 bytes than the data volume of 279 bytes of
the other sub-data.
Also, in Fig.4, the third frame F3 of the third small-unit block Bs is constituted
by the remaining 588 bytes as from the 1177th byte of main data of the sector 11 up
to the end of the main data of the sector 16. That is, the third frame F3 of the main
data records the data volume of 9408 bytes in 588 bytes of the sector 11 and 1764 x
5 = 8820 bytes of the sectors 12 to 16. The header H of the third small-unit block Bs
has a data volume of 10 bytes since the leading sector 11 of the small-unit block Bs is
in need of the time code indicative of the frame beginning in the main data and three
packets for the sub-data and two main data. Since the header of the sector 11 is larger
by 5 bytes than the other header of 5 bytes, the data volume of the sub-data of the
sector 11 is 274 bytes which is lesser by 5 bytes than the data volume of 279 bytes of
the other sub-data, as in the case of the above-mentioned second small-unit block Bs.
Thus, the large-unit block BL of the extension mode shown in Fig.4 sets the
sum of the main data M for three frames to 28224 bytes, while the sum of the sub-data
is set to 4451 bytes.
Therefore, by constituting the large-unit block BL with 16 sectors, a data
volume of 4451 bytes per three frames, that is 4451 x 75/3- 111275 bytes (111.275
kB) per second can be used as sub-data S for the extension mode. This means that the
data volume of the sub-data S for the extension mode can be varied to a level
exceeding 12 times the data volume of the sub-data S of 365 bytes per three frames,
that is 365 x 75/3 = 9125 bytes (99.125 kB) per second or 9.125 kBps in terms of the
transfer rate, for the standard mode, in which the large-unit block BL is constituted
with 14 sectors.
Meanwhile, in the compact disc (CD) graphics (G) or CD-G, routinely used at
present in e.g., karaoke, in which the 6 bits of the sub-data R to W are used for the
graphics information, the data volume per second is 96 x 6 x 75/8 = 5400 bytes,
corresponding to 5.4 kBps in terms of the transfer rate, so that the transfer rate for the
extension mode is of a level exceeding 20 times that of the CD-G.
It should be noted that, in the case of the streaming reproduction in the Internet,
now in widespread use, that is in writing in the RAM and immediate reproduction of
the picture information transmitted over the Internet, the transfer rate in excess of 64
kBps is used. The above-described transfer rate for the extension mode sufficiently
meets this transfer rate such that it can be also used sufficiently as the medium on the
side of the sender sending the picture signals on the Internet.
Meanwhile, the length of the header H is variable in the above-mentioned
standard and extension modes because the data volume of the sub-data S is variable
but the header H plus sub-data S is constant.
If the length of the header H is expressed with the number of bytes,
number of header bytes = 1 byte + (Njpackets) x 2 bytes + (N_Audio_Start)X
3 bytes.
In this equation, how many packets there are in one sector, how many there are
the frames having the newly beginning time codes, and the types of the respective data
for the number of packets, are written in the first byte. N_Packets is a variable
indicating the number of packets included in a sector, while N_Audio_Start is a
variable indicating the number of audio frames newly beginning in the sector. If there
is any newly beginning audio frame, a three-byte time code is required.
For example, the data volume of the header H of the sector 6 of Fig.4 is
1 byte + (3JPackets)*2+(l_Audio_Start)*3 bytes = 10 bytes.
Also, since the start position of main data M, that is the byte position, is
constant in a sector, as shown in Figs.2A and 2B, data of left and right channels,
totalling at two channels, recorded as main data on an optical disc, can DC easny
retrieved from the optical disc.
The method of discriminating the standard mode or the extension mode, as the
above-mentioned two modes, from each other, is explained. The following
explanation is made taking a specified example of a hybrid optical disc having both a
high density recording layer (HD layer) for recording the high-speed 1-bit audio
signals and a CD layer for recording audio signals etc for a compact disc.
First, the hybrid optical disc is explained with reference to Figs.5 A and 5B. In
this hybrid optical disc, master preparation can be achieved by the high-speed 1-bit
audio signals for the HD layer shown in Fig.5B5 while the CD sound, simultaneously
prepared, can be recorded on the CD layer shown in Fig. 5 A. This enables the hybrid
optical disc to be reproduced, similarly to the conventional CD, by a conventional CD
player. The CD layer and the HD layer each are provided with a lead-in zone, a data
zone and a lead-out zone, looking from the inner rim side towards the outer rim side.
The HD layer has, in a management area in a data zone, an identifier for
discriminating two modes, that is the standard mode and the extension mode, from
each other, as discussed above. The management area of the HD layer is hereinafter
explained with reference to the detailed format diagram of Fig.6.
The data zone shown in Fig. 6 A includes a two-channel stereo area for recording
the sound by the high-speed 1-bit audio signals of the two-channel stereo and a multichannel
area for recording the multi-channel sound, as shown in Fig.6B. The data
zone also includes a file system area, a master TOC area having recorded therein the
management information TOC indicating the type of the entire disc, and an extra data
area.
The ancillary information, such as the above-mentioned graphics information,
is recorded as sub-data in a two-channel stereo area. This two-channel stereo area has
the two-channel stereo audio tracks, that are made up of n tracks (track 1, 2, 3, •--, n)
shown in Fig.6D and which are sandwiched between the two area tracks (Area TOC-1
and Area TOC-2), as shown in Fig.6C.
The HD layer of the hybrid optical disc records the aforementioned identifier
for discriminating the sub-data having the variably controlled data volume as the mode
discriminating information, with the two area TOCs (Area TOC-1 and Area TOC-2)
as the management area. Although the two area TOCs (Area TOC-1 and Area TOC-2)
serve as the management area, only one of the Area TOC-1 or Area TOC-2 suffices.
The above-mentioned identifier may also be written in the master TOC area as the
management area.
If the above-mentioned identifier, recorded in the management area, is read out
by the optical disc reproducing device shown in Fig.7 to grasp the above-mentioned
standard mode or the extension mode, the user is able to reproduce e.g., the graphics
information with the transfer rate of 9.125 kBps or 111.275 kBs.
Referring to Fig.7, the present optical disc reproducing device includes an
optical read-out unit 11, such as a pickup, producing read-out signals from the HD
layer of the hybrid optical disc 1, anRF amplifier 13 for generating playback data from
read-out signals of the optical read-out unit 11, a demodulation decoder 18 for
demodulating and decoding the large-unit block BL from the playback data of the RP
amplifier 13, and a data separator 19 for separating the main data M and the sub-data
S from the large-unit block BL decoded by-the demodulation decoder 18. The
reproducing device also includes a separate controller 20 for controlling the data
separator 19 based on the mode discriminating information recorded in the
management area, such as the above-mentioned Area TOC-1 and Area TOC-2.
The optical disc reproducing device 10 also includes a phase lock loop (PLL)
circuit 17 for generating clock signals synchronized with the reproducing signals form
the RP amplifier 13, a servo signal processor 14 for causing the optical read-out unit
11 to follow the optical disc 1 based on error playback signals from the RP amplifier
13, a focussing driver 15 for driving the focussing coil constituting the optical read-out
unit 11, respective drivers 16 for driving a tracking coil or a thread mechanism, a
timing generating circuit 21 for rotating the optical disc 1 at a CLV from the playback
signals from the RP amplifier 13, and a CLV processor 22 for generating CLV control
signals responsive to the timing signals from the timing generating circuit 21, The
optical disc reproducing device 10 also includes a spindle motor 12 for receiving the
CLV control signals from the CLV processor 22 to run the optical disc 1 in rotation
at CLV.
The optical disc reproducing device 10 also includes a controller 23 for
deciphering the sub-data from the data separator 19 to cause the graphics information
to be displayed on a display unit 24, connected for this purpose to the controller 23,
an actuating unit 30, a memory.29, and a D/A converter 25 for converting the main
data M from the data separator 19. The optical disc reproducing device 10 further
includes a volume controller 26 for volume-controlling the analog audio signals under
control by the controller 23, an amplifier 27 and a speaker 28.
The optical read-out unit 11 is made up of an objective lens, laser, a detector
and a focussing coil etc. The focussing driver 15 is controlled by a servo signal
processing circuit 14. The optical read-out unit 11 includes, in addition to the above
components, a tracking coil for driving the objective lens radially of the optical disc
1 and a thread mechanism for driving the optical system radially of the optical disc.
The respective coils are directly driven by the respective drivers.
The servo signal processing circuit 14, PLL circuit 17, a demodulating decoder
18, a data separator 19, a separate controller 20, a timing generating circuit 21 and the
CLV processor 22 may be constituted in a digital signal processor.
The operation of the above-described optical disc reproducing device 10 is
hereinafter explained. It the following explanation, it is presupposed that the HD layer
102 of Fig. 1 is to be reproduced. The optical disc 1 is chucked so as to be rotationally
driven by the spindle motor 12. From the optical disc 1, run in rotation at CLV, the
recording information is read out by the optical read-out unit 11 to produce read-out
signals.
The read-out signals, converted by the detector of the optical read-out unit 11.
are fed to the RF amplifier 13. The RF amplifier 13 converts the read-out signals into
playback signals, while generating tracking error signals and the focussing error signals
from the read-out signals to route the error signals to the servo signal processor 14.
The servo signal processor 14 drives the focussing driver 15 and the respective
drivers 16 to reduce the tracking error signals and the focussing error signals to zero.
The playback signals from the RP amplifier 13 are routed to the demodulation
decoder 18 and to the PLL circuit 17. The demodulation decoder 18 demodulates and
decodes the playback signals to route the large-unit block BL data shown in Figs.2A,
2B, 3 and 4 to the data separator 19.
The data separator 19 separates the main data M and the sub-data S from the
large-unit block BL data. On the other hand, the separate controller 20 reads the mode
conversion identification information, as the aforementioned identifier, from the largeunit
block BL data, to recognize whether the large-unit block BL data has been
recorded in the standard mode or in the extension mode, in order to control the
separation operation in the data separator 19.
Since the data separator 19 can send the sub-data recorded in the pre-set mode
so that the controller 23 is able to display the graphics information in the display unit
24 at the transfer rate of 9.125 kBps or 111.276 kBps.
Thus, in an optical disc having the data zone of the format shown in Figs.2A,
2B, 3 and 4, it is possible to change only the data volume of supplementary data
without changing.the data volume of the main data recorded in unit time. Since the
transfer rate higher than that used for sub-data of the compact disc at the minimum is
guaranteed as the transfer rate used in the sub-data of the compact disc, all sorts of the
application exploiting the CD sub-code can be realized. The Internet application is
possible with the mode which realizes the transfer rate in excess of 64 kBs. As the
mode exceeding the standard mode, the display of high-quality still picture and the
karaoke application which is based on the high-quality still picture is also possible.
Moreover, in any case, only the transfer rate for the ancillary information can
be switched depending on the mode while the constant recording specifications of the
music data as main data and high sound quality are maintained. Also, since there is
only one sort of the recording specifications of the source serving as the sound source,
there is no necessity of providing a formulating mechanism for plural sorts of the
recording specifications. The source management for the sound source is facilitated
because there is no necessity of supervising plural sorts of the recording specifications.
The designing of the formulating apparatus centered about the recorder is also
facilitated because there is only one sort of the recording specifications.










WE CLAIM:
1. Reproducing apparatus adapted for reproducing a disc-shaped recording medium (1)
having a program area in which digital data having a header data (H), main data (M) and
sub data (S) arranged in blocks (BL), the blocks (BL) being recorded with a variable
number of sectors (Bs), are recorded, each sector (Bs) being of pre-set length and
including header data (H), main data (M) and sub-data (S), and a management area in
which an identifier is recorded for discriminating the variable number of sectors (Bs) in
order to render the data volume of the sub-data (S) in the blocks (Bs) variable with the
volume of the main data (M) on the blocks (BL) remaining fixed, said reproducing
apparatus characterized in that it is provided with the following elements:
reproducing means (11) for reproducing the digital data having the main data and the sub
data from said program area and the identifier from said management area;
separating means (19) for separating the main data and the sub-data from the digital data reproduced by said reproducing means (11) from the program area of the disc-shaped recording medium (1); and
control means (23) for controlling said separating means based on said identifier that is reproduced from said management area of said disc shaped recording medium (1) by said reproducing means.
2. The reproducing apparatus as claimed in claim 1, wherein the data length of said header (H) is varied depending on the change in said variable number of sectors.
3. The reproducing apparatus as claimed in claim 1, wherein the disc shaped recording medium is having multiple layers.
4. The reproducing apparatus as claimed in claim 1, wherein digital signals of multiple quantization bits sampled at a pre-set sampling frequency are recorded on one (101) of the multiple layers of said recording medium, and wherein digital signals of a sole quantization bit sampled at a frequency an integer number times the pre-set sampling frequency are recorded in an other (102) of the multiple layers.

5. The reproducing apparatus as claimed in claim 1, wherein the. digital data and the
identifier are recorded on one of said multiple layers of the disc-shaped recording
medium.

Documents:

2165-DEL-2005-Abstract-(01-10-2010).pdf

2165-del-2005-abstract.pdf

2165-DEL-2005-Claims-(05-05-2010).pdf

2165-DEL-2005-Correspondence-Others-(01-10-2010).pdf

2165-DEL-2005-Correspondence-Others-(05-05-2010).pdf

2165-DEL-2005-Correspondence-Others-(11-05-2010).pdf

2165-DEL-2005-Correspondence-Others-(16-11-2010).pdf

2165-del-2005-correspondence-others.pdf

2165-del-2005-description (complete).pdf

2165-del-2005-Drawings-(05-05-2010).pdf

2165-del-2005-drawings.pdf

2165-DEL-2005-Form-1-(01-10-2010).pdf

2165-del-2005-form-1.pdf

2165-del-2005-form-18.pdf

2165-DEL-2005-Form-2-(01-10-2010).pdf

2165-del-2005-form-2.pdf

2165-DEL-2005-Form-3-(11-05-2010).pdf

2165-del-2005-form-3.pdf

2165-del-2005-form-5.pdf

2165-DEL-2005-GPA-(05-05-2010).pdf

2165-del-2005-gpa.pdf

2165-DEL-2005-Petition-137-(11-05-2010).pdf

2165-delnp-2005-claims.pdf

abstract1.jpg

abstract2.jpg


Patent Number 245007
Indian Patent Application Number 2165/DEL/2005
PG Journal Number 53/2010
Publication Date 31-Dec-2010
Grant Date 28-Dec-2010
Date of Filing 16-Aug-2005
Name of Patentee SONY CORPORATION, a Japanese company
Applicant Address 7-35 KITASHINAGAWA 6-CHOME, SHINAGAWA-KU, TOKYO, JAPAN.
Inventors:
# Inventor's Name Inventor's Address
1 MUNEYASU MAEDA C/O. SONY CORPORATION 7-35 KITASHINAGAWA 6-CHOME, SHINAGAWA-KU, TOKYO, JAPAN.
PCT International Classification Number G11B7/007
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 P10-099685 1998-04-10 Japan