Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-19
1993-10-19
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
341 67, 358 86, 358135, 358136, H04N 713, H04N 7133, H04N 7137
Patent
active
052550907
ABSTRACT:
A distortion adaptive vector quantization method is employed to select, for each input vector, several codevectors from a tree structured codebook. The first codevector defines a basis signal, and each subsequent codevector defines an enchancement signal. The basic signal is indicative of the full codebook address from which the first codevector was selected. Each enhancement signal is indicative of only so much of the additional address bits that are required, in combination with the basic signal, to identify the address of the codebook from which the subsequent codevectors were selected. The basic signal and each enhancement signal are transmitted to a decoder which may employ only the basic signal, or the basic signal and one or more of the enhancement signals to reproduce the input vector. The reproduction quality of the input vector increases with the number of enhancement signals chosen.
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Britton Howard W.
Scientific-Atlanta, Inc.
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