Interframe adaptive vector quantization encoding apparatus and v

Details Interframe adaptive vector quantization encoding apparatus and v Interframe adaptive vector quantization encoding apparatus and v

1986-02-28

1987-12-01

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358134, H04N 712

Patent

active

047108126

ABSTRACT:
In an interframe adaptive quantization encoding apparatus to perform efficient encoding of video signals using vector quantization method, analog signals raster-scanned from the left to the right on the screen and from the upper side to the lower side are converted into digital signals, the digital signals per every m picture elements x n lines are made a block and the block data is subjected to mean value separation in a vector quantization encoder thereby input vector is formed, inner product between the input vector and output vector read from a code book ROM is estimated by an inner product operation circuit, and maximum value of the inner product is estimated by a maximum inner product detection circuit and made amplitude coefficient, thereby efficient encoding is performed. The efficient encoding data is transmitted to the transmission path by a transmission data buffer and at the same time threshold value of movement detection in the vector quantization encoding is controlled by a movement detection control circuit, and the encoding data supplied from the vector quantizer is decoded by a vector quantization decoder and the block data is reproduced, thereby the apparatus can be constituted without increasing the circuit scale.

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A. Buzo et al., "Speech Coding Based Upon Vector Quantization", IEEE Trans., 1980, ASSP-28, pp. 562-574.

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