Celp type voice encoding device and celp type voice encoding method

摘要

A CELP type voice encoding device is disclosed. This device comprises quantizing means including a first gain quantizer for quantizing pitch gain and a second gain quantizer for performing quantization using a difference between an output value of said first gain quantizer and a pitch gain determined by closed loop searching; a noise code book; first control means for adaptively controlling method for searching said noise code in accordance with said output value of said first gain quantizer; second control means for controlling said first and second gain quantizers in such a manner that said first gain quantizer quantizes said pitch gain before said first control means determines said method for searching and said second gain quantizer performs said quantization after said noise code book has been searched; and means for obtaining a sum signal of said output value of said first gain quantizer and an output value of said second gain quantizer and generating an adaptive code book component of an excited sound source vector using said sum signal; whereby said one excited sound source vector is generated with quantization by said first gain quantizer, searching of said noise code book and quantization by said second gain quantizer being performed once respectively within a same processing unit time period.