Speech encoding method and apparatus

摘要

A speech encoding method and apparatus whereby the bit rate of encoded data can be made variable. An output vector x is weighted vector quantized by a vector quantization unit 502 of a first vector quantization unit 500. The shape index is outputted at an output terminal 503, while a quantized value X0' is subtracted from a source vector x at an adder 505. The resulting quantization error vector y is dimensionally divided by a second vector quantization unit 510. The resulting weighted vector quantized shape index data are outputted at output terminals 5121, 5122. The quantized values Y1' and Y2' are dimensionally combined and added by an adder 513 to the quantized value X0'. The resulting quantized value X1 is outputted.