Decoding circuit for variable length code

Details Decoding circuit for variable length code Decoding circuit for variable length code

1993-08-03

1995-03-14

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341106, 341 65, H03M 740

Patent

active

053980271

ABSTRACT:
A variable length code decoding circuit includes a decoding table storing data, which has an upper field selectively indicative of a meaning of the code and an address for next access, selected depending upon a state transition upon decoding the variable bit length code per n bits (n is an integer greater than or equal to 2), an intermediate field indicative of a shifting magnitude of the shift register upon completion of decoding, and a lower field indicative of a state of code decoding. The bit sequence of the variable bit length code in a shift register is shifted in a magnitude corresponding to a shifting magnitude indicated in the intermediate field when data indicative of the code decoding state in the lower field of the data read out from the decoding table storage means indicates completion of decoding and corresponding to n bits when the data indicative of the code decoding state in the lower field indicates continuation of decoding. An address for accessing the decoding table is generated by replacing the intermediate field and the lower field with leading n bits of the shift register.

REFERENCES:
patent: 3921143 (1975-11-01), Woodrum
patent: 4580129 (1986-04-01), Bahgat
patent: 4899149 (1990-02-01), Kahan
patent: 5126738 (1992-06-01), Sasaki
patent: 5181031 (1993-01-01), Tong et al.
patent: 5220325 (1993-06-01), Ackland et al.
patent: 5254991 (1993-10-01), Ruetz et al.

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