Voice encoding device, voice decoding device, recording medium for recording program for realizing voice encoding/decoding and mobile communication device

摘要

A CELP type voice encoding device and a CELP type encoding device. Both the CELP type encoding device and the CELP type encoding device have a noise code book that can be searched in two modes in accordance with linear predictive analysis results, a pitch gain and a pitch cycle, all of which are obtained as analysis results of an input voice. Also the number of pulses forming a noise code vector is switched between a first case where a variation in pitch cycle is small througtout continuous sub-frames and in a second case where the variation is not small througtout continuous sub-frames.