| 摘要 |
To transmit and record input pattern efficiently by dividing into vector quantization index and its difference signal, and sequentially optimize the vector quantization code book. A least distortion vector determining unit 101 issues a representative vector ym having least square error in yi in the code book, with respect to an input 64-dimensional vector x, and simultaneously issues its index m, and the difference vector d obtained as d = x - ym in a subtractor 103 is quantized in a quantizing unit 104, and is issued together with the index data. Afterwards, a difference vector d' is determined in an inverse quantizing unit 106, and a code book changing unit 107 changes so that the representative vector ym may be closer to the input vector x by using this difference vector. At the decoding side, synchronously, the representative vector ym is changed. <IMAGE> |
