Method and system for decoding N-tuple variable length code

Details Method and system for decoding N-tuple variable length code Method and system for decoding N-tuple variable length code

2006-03-28

2008-05-13

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

C341S065000

Reexamination Certificate

active

07372379

ABSTRACT:
This application provides a flexible and efficient way to handle escape symbols during decoding of N-tuple variable length codes (VLCs). The user can request that the decoder resolve a sequence of symbols. The Huffman lookup tables can contain a field to notify the decoder if a given N-tuple VLC includes an escape symbol. For non-escape symbols, as identified by the escape indicator bit in the Huffman lookup table entry, the decoder can finish resolving the N symbols of the N-tuple without requiring a symbol-by-symbol comparison of each symbol to detect escape conditions. For escape symbols, as identified by the escape indicator bit in the Huffman lookup table entry, the decoder can either look back to the user for help, or use pre-defined logic to resolve the escape symbols. Aspects of certain embodiments enable parallelism between Huffman symbol decoding and escape condition detection without losing future expandability.

REFERENCES:
patent: 6587057 (2003-07-01), Scheuermann
patent: 7113115 (2006-09-01), Partiwala et al.
patent: 7129862 (2006-10-01), Shirdhonkar et al.
patent: 7132963 (2006-11-01), Pearlstein et al.
patent: 7289047 (2007-10-01), Nagori

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