Method and apparatus for coding digital data using vector quantizing techniques
US5444488A · kind A · utility
24Cited by
6References
9Claims
0Family size
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Key dates
| Filing date | Jun 15, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Jun 15, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/94
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.