High speed variable length code decoding apparatus

Details High speed variable length code decoding apparatus High speed variable length code decoding apparatus

1995-11-17

1997-07-15

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341106, H03M 740

Patent

active

056487754

ABSTRACT:
A variable length code decoding apparatus for decoding sequential variable length codewords includes a bit shifting circuit for providing a window output sequence of the two fixed length segments stored in latch circuits, a bit generation circuit for generating an N-bit output sequence by using the window output sequence as low-order bits of the N-bit output sequence, a decoding sequence generation circuit for producing a decoding output sequence of the two fixed length segments in response to the codeword length signal, a table memory device for producing fixed length codewords in response to a variable length codeword that begins at the first bit position of the decoding output sequence and for producing codeword lengths corresponding to the decoded variable length codewords, an output selection circuit for selecting an output codeword and a codeword length among the produced fixed length codewords and codeword lengths corresponding to the decoded variable length codewords, in response to an output selection signal generated by a variable length decoding control block, and a carry signal generation means for generating the position control signal.

REFERENCES:
patent: 4899149 (1990-02-01), Kahan
patent: 5173695 (1992-12-01), Sun et al.
patent: 5245338 (1993-09-01), Sun

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