| 摘要 |
PURPOSE:To attain vector quantization by a few reference vectors by folding an input vector at a plane perpendicular to each reference vector to approach an input vector to a center vector and extracting a bit of information on which side of symmetrical planes the input vector exists in the case of the folding as a vector index. CONSTITUTION:In the case of the inner product of (X0, R0)<0, where X0 is the vector of mean value to be separated and R0 is a 1st reference vector R0, the reference vector R0 is outputted from a gate circuit 15, the output of an accumulator 13 and the inner product are multiplied by a multiplier 16 and the result is subtracted from the vector X0 retarded by a delay circuit 17 by a coefficient 2. That is, the conversion output X1 of a conversion stage block 10 is expressed as X1=X0-2I0.(X0, R0)R0. The vector X1 is converted similarly as X2, X3,..., XN succeedingly and index information I1, I2,..., IN-1 are outputted form each conversion stage. Thus, the number of reference vectors is minimized as soon as possible and the vector coding system close to an ideal characteristic is formed.
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