Television – Bandwidth reduction system – Data rate reduction
Patent
1993-03-26
1995-03-14
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348405, 348418, H04N 7130
Patent
active
053980697
ABSTRACT:
Vector quantization of a data vector proceeds through successive stages of a multi-stage vector quantization encoder until either (i) a measure of distortion between the vector input to a given stage and the codevector selected at that stage satisfies a threshold value or (ii) the last stage of the encoder is reached. The threshold value varies according to the fullness of a buffer which stores vector quantized data to be transmitted. Consequently, the last stage reached may differ from data vector to data vector. Compression efficiency therefore improves. Preferably, the mean value of each data vector is removed prior to vector quantization.
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patent: 5172228 (1992-12-01), Israelsen
patent: 5231485 (1993-07-01), Israelsen et al.
Yo-Sung Ho and Allen Gersho, "Variable-Rate Multi-Stage Vector Quantization for Image Coding", IEEE pub. no. CH2561-9 88 0000-1156, pp. 1156-1159 (1988).
Biing-Hwang Juang, A. H. Gray, Jr., "Multiple Stage Vector Quantization for Speech Coding", IEEE pub. no. CH1746-7/82/0000-0597, pp. 597-600 (1982).
Huang Chien M.
Israelsen Paul D.
Chin Tommy P.
Lee Richard
Scientific Atlanta
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