Rate adaptive huffman coding

Details Rate adaptive huffman coding Rate adaptive huffman coding

1993-04-01

1995-05-30

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348422, H04N 732

Patent

active

054206391

ABSTRACT:
Methods for compressing data in a system employing vector quantization (VQ) and Huffman coding comprise: First, quantizing an input vector by representing the input vector with a VQ codevector selected from a VQ codebook partitioned into subsets, wherein each subset comprises codevectors and each codevector is stored at a corresponding address in the VQ codebook. Next, generating a rate dependent Huffman codeword for the selected codevector, wherein the rate dependent Huffman codeword identifies the subset of the VQ codebook in which the selected codevector is stored. And finally, generating a substantially rate independent Huffman codeword for the selected codevector, wherein the substantially rate independent Huffman codeword identifies a particular VQ codevector within the subset identified by the rate dependent Huffman codeword.

REFERENCES:
patent: 4839724 (1989-06-01), Keesen et al.
patent: 5136663 (1992-08-01), Nishio
patent: 5172228 (1992-12-01), Israelsen
patent: 5194950 (1993-03-01), Murakami et al.
patent: 5231485 (1993-07-01), Israelsen et al.

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