Title of Invention

DIGITAL AUDIO BROADCASTING METHOD USING PUNCTURABLE CONVOLUTIONAL CODE

Abstract This invention relates to a bropadcasting method encodes program material using convolutional codes having non-puncturable bits and puncturable bit and modulates orthogonal frequency division multiplexed carrier signals with the convolutional codes. The non-puncturable bits are carried by a first group of the carriers and the puncturable bits are carried by a second group of the carriers, where the first group of carrier signals is less susceptible to interfernce than the second group of carrier signals. The carrier signals are then broadcast to receivers which determine if the carriers in the second group have been corrupted and erase puncturable bits carried by any of the carriers which have been determined to be corrupted. This produces punctured codes which are subsequently decoded to recover the program material.
Full Text

Documents:


Patent Number 210354
Indian Patent Application Number IN/PCT/2000/00344/KOL
PG Journal Number 40/2007
Publication Date 05-Oct-2007
Grant Date 03-Oct-2007
Date of Filing 22-Sep-2000
Name of Patentee IBIQUITY DIGITAL CORPORATION
Applicant Address 8865 STANFORD BOULEVARD, SUITE 202 COLUMBIA, MARYLAND 21045, U.S.A.
Inventors:
# Inventor's Name Inventor's Address
1 STEHLIK ROY R. 7545 MURRAY HILL ROAD, COLUMBIA MD 21046, U.S.A
2 CAMMARATA DENISE M. 12087 LONG LAKE DRIVE, OWINGS MILL, MD 2117, U.S.A
3 KROEGER BRIAN W, 12813 AMBERWOODS WAY, SYKESVILLE, MD 21784, U.S.A.
PCT International Classification Number H 04 H 1/00
PCT International Application Number PCT/US99/04329
PCT International Filing date 1999-02-24
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/049,140 1998-03-27 U.S.A.