Speech parameter encoding device which includes a dividing circuit for dividing a frame signal of an input speech signal into subframe signals and for outputting a low rate output code signal

Abstract

On encoding with a smallest possible number of bits LPC parameters produced by an LPC analyzer from at least one of subframe signals of each frame signal of an input speech signal, a divider divides the LPC parameters into several parameter regions. Using vector code books loaded for each parameter region with code vectors, a vector quantizer quantizes the LPC parameters into, for use as quantized codes, indexes of selected vectors which are selected from the code vectors and of which a linear combination minimizes a quantization distortion.