Method and apparatus for coding digital data using vector quanti

Details Method and apparatus for coding digital data using vector quanti Method and apparatus for coding digital data using vector quanti

1993-06-15

1995-08-22

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348417, 348418, 348422, H04N 728

Patent

active

054444888

ABSTRACT:
A vector quantization encoder comprises a codebook built with the so-called Linde-Buzo-Gray (LBG) algorithm, an intermediary codebook built from the initial codebook (LBG) and a Hash-table containing subsets of the initial codebook (LBG). Vector quantization is then performed in two steps. First, a multistep prequantization of an input vector gives an index in the Hash-table which points to a subset of vectors of the initial codebook (LBG). Then a full search is performed within the pointed subset of vectors of the initial codebook (LBG).

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patent: 5067152 (1991-11-01), Kisoe et al.
patent: 5113516 (1992-05-01), Johnson et al.
patent: 5194864 (1993-03-01), Nakano

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