Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2005-08-23
2005-08-23
Lee, Young (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
06934338
ABSTRACT:
A variable length decoder (VLD) for decoding MPEG-1 and -2 syntax compliant video bit streams. The VLD includes a micro-sequencer and VLD command decode/execution unit for controlling the MPEG decoding process using a novel instruction set. The instruction set includes a set of commands for decoding the video data and a set of flow control instructions. A rotator/barrel shifter is provided for making a predetermined number of encoded bits from the video bit stream available to the VLD and a variable length table decoder for variable length decoding using the MPEG standard variable length code (VLC) tables. The variable length table decoder shares a prefix pattern matching scheme across all of the VLC tables and organizes the variable length codes into a series of subtables. Each subtable corresponds to one of the unique prefix patterns. Variable length codes are decoded by identifying a leading pattern in the video data bit stream and, in parallel, accessing the subtable corresponding to that leading pattern. Run-length and amplitude level DCT coefficient symbols are stored in compressed form, and decoded as needed by an inverse transform unit. Motion vectors are also stored until needed by a motion compensation unit.
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Bose Subroto
Bublil Moshe
Gadre Shirish C.
Hong John
Ozcelik Taner
Lee Young
Sony Corporation
Sony Electronics Inc.
Wood Herron & Evans LLP
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