Shifter stage for variable-length digital code decoder

Details Shifter stage for variable-length digital code decoder Shifter stage for variable-length digital code decoder

1995-02-06

1997-09-09

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

H03M 742

Patent

active

056661150

ABSTRACT:
The invention relates to a shifter stage for a variable-length digital code decoder which decodes one code per clock cycle, reads input data arriving from a memory, supplies a logical unit on each cycle with a word having the size of the longest variable-length code to be decoded, receives from the logical unit the number of bits of the code decoded on the preceding clock cycle, and effects a shift in the data read equal to the cumulative total of the lengths of codes decoded since the last read of input data.
It comprises a first barrel shift register (11) which reads the input data and performs a shift in the data read equal to the cumulative total of the lengths of the codes decoded between the preceding cycle and the start of the last read, and a second barrel shift register (13) which receives the data arriving from the first register and performs a shift equal to the length of the code decoded on the preceding cycle.

REFERENCES:
patent: 5229863 (1993-07-01), Kao et al.
patent: 5245338 (1993-09-01), Sun

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