Interframe adaptive vector quantization encoding apparatus and video

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.