Decoding bit streams encoded according to variable length codes

Details Decoding bit streams encoded according to variable length codes Decoding bit streams encoded according to variable length codes

2006-10-31

2006-10-31

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

C341S065000

Reexamination Certificate

active

07129862

ABSTRACT:
A decoding approaching suitable for architectures such as Very Long Instruction Word (VLIW), in which throughput performance would be reduced in case if large blocks of conditional core are executed repetitively. Some of the code-words are received according to escape modes, which require different kinds of processing depending on specific mode. The decoding logic is partitioned into two parts, with the first part accessing entries in tables corresponding to code-words. The first part writes the symbol value retrieved from the accessed entry into an output buffer. In case of escape modes, the first part writes an intermediate decoded value to the output buffer, and an escape mode identifier retrieved from an accessed entry, and a position identifier in the output buffer for the symbol sought to be decoded in an intermediate buffer. The second part then performs the specific processing required for each entry in the intermediate buffer. The block sizes executed on conditions are reduced, thereby facilitating higher degree of parallelism and thus higher throughput performance.

REFERENCES:
patent: 5650781 (1997-07-01), Park
“Information technology—Generic coding of audio-visual objects”—Part 2: Visual; Coding of moving pictures and audio;Oct. 1998; pp. 1-10 (Table of Contents), 105-106 & 197-206 (Total 22 Pages); ISO/IEC FDIS 14496-2;ISO/IEC; Atlantic City.

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