High speed variable-length decoder arrangement with reduced memo

Details High speed variable-length decoder arrangement with reduced memo High speed variable-length decoder arrangement with reduced memo

1995-12-01

1997-09-02

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 63, H03M 740, H03M 746

Patent

active

056637268

ABSTRACT:
A variable-length decoder arrangement having enhanced speed capacity, in which an input bit stream is tagged with the codeword boundary information by a tree-searching state machine. In order to reduce the memory requirements of the tag buffer, run-length encoding techniques are used to compress the tag information. This compressed tag information is used in a closed-loop parsing loop wherein a compressed tag stream length conversion table decoder is used to determine the length of the compressed tag codewords which are used to control the barrel shifter in the closed-loop parsing loop, while the compressed tag codewords are decoded into actual word-lengths in a word-length conversion table decoder. These actual word-lengths are then accumulated and used to control a barrel shifter for decoding the variable-length bit stream.

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