Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-19
1993-09-21
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
341106, 358135, H04N 712
Patent
active
052473570
ABSTRACT:
A variable rate vector quantization apparatus and method employs a tree structured codebook. Code vectors are selected from different levels of the codebook according to the value of a threshold. The value of the threshold is periodically adjusted according to the fullness of a buffer that stores vector quantized data to be transmitted. According to the invention, vector quantized data for redundant, or similar, vectors is not transmitted. Rather, a "copy last vector" instruction is transmitted for these vectors to achieve further data compression. A method of mean removal from vectors to be vector quantized is also disclosed.
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Kostak Victor R.
Scientific - Atlanta, Inc.
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