Apparatus and method for decoding variable-length code

Details Apparatus and method for decoding variable-length code Apparatus and method for decoding variable-length code

1995-01-27

1997-04-29

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341106, H03M 740

Patent

active

056253559

ABSTRACT:
A variable-length-code decoder of this invention decodes an input bit stream including an input bit string having a codeword of a fixed-length code and a plurality of codewords of variable-length codes combined in a predetermined format. The decoder includes: a shifter for shifting the input bit string by a desired number of bits; a pattern detector for detecting a specific pattern in the bit string, and outputting a detection signal; two code tables provided for the respective variable-length codes, each code table having the length of each codeword (codeword length) and the decoded-word corresponding to the codeword, and outputting a codeword length and a decoded-word of a corresponding codeword based on the bit string output from the shifter; a processor for storing the format of the input bit string, outputting the length of the fixed-length code and decoded data of the fixed-length code, and selecting, for each of the variable-length codewords, one of the code tables to which the variable-length codeword belongs, based on the detection signal and the format; a codelength selector for selecting the codeword length or the fixed-length code, and for setting the shift amount for the input bit string in the shifter; and an output circuit for selectively outputting the decoded-word or the decoded data.

REFERENCES:
patent: 4509038 (1985-04-01), Hirano
patent: 4899149 (1990-02-01), Kahan
patent: 5426463 (1995-06-01), Reininger et al.
patent: 5428356 (1995-06-01), Ozaki
patent: 5488366 (1996-01-01), Wu
M. Sun et al., "A Parallel Variable-Length-Code Decoder for Advanced Television Applications", Third International Workshop on HDTV, Sep. 1, 1989.

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