High speed variable length code decoding apparatus

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

1994-11-29

1996-10-01

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

341 67, 341 65, H03D 100, H03M 740

Patent

active

055616909

ABSTRACT:
A variable length code (VLC) decoding apparatus for decoding sequential variable length codewords includes a second barrel shifter cascaded to a first barrel shifter for providing a second table memory device with a decoding window output sequence which is directly shifted in response to a codeword length output from a first table memory device so that the first bit in the decoding window output sequence is the first bit of the next variable length codeword in a decoding window output sequence from the first barrel shifter; and the second table memory device for producing a fixed length codeword in response to each variable length codeword in the second decoding window output sequence, to thereby decode, at each clock cycle, consecutively two variable length codewords without an operational delay in an accumulator for shifting the decoding window of the first barrel shifter.

REFERENCES:
patent: 5173695 (1992-12-01), Sun et al.
patent: 5245338 (1993-09-01), Sun
patent: 5343195 (1994-08-01), Cooper
patent: 5400075 (1995-03-01), Sawatier
patent: 5404166 (1995-04-01), Gillard et al.

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