Coded data generation or conversion – Digital code to digital code converters – To or from variable length codes
Patent
1996-03-18
1997-10-14
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from variable length codes
341 65, H03M 740
Patent
active
056776900
ABSTRACT:
A variable-length code decoding apparatus for decoding sequential variable-length codewords includes a first barrel shifter for producing a first window output sequence in response to a window control signal, a second barrel shifter for producing a second window output sequence in response to a decoded codeword length, a relay circuit for latching the second window output sequence for one-half the clock cycle and providing the latched second window output sequence as a decoding output sequence, a first look-up table memory for producing the decoded codeword length and a pre.sub.-- fix code length in response to a pre.sub.-- fix code of the variable-length codeword that begins at the first bit position of the decoding output sequence, a third shifter for producing a code value in response to the pre.sub.-- fix code length, a second look-up table memory for producing a fixed-length word in response to the decoded codeword length and the code value, and an accumulation block for producing the window control signal.
REFERENCES:
patent: 5245338 (1993-09-01), Sun
patent: 5428356 (1995-06-01), Ozaki
patent: 5561690 (1996-10-01), Park
patent: 5572208 (1996-11-01), Wu
Daewoo Electronics Co. Ltd.
Hoff Marc S.
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