PITCH ANALYSIS DEVICE, VOICE ENCODING DEVICE, PITCH ANALYSIS METHOD AND VOICE ENCODING METHOD

摘要

PROBLEM TO BE SOLVED: To perform highly accurate pitch analysis with a small calculation amount even to a target signal with a high sampling rate.;SOLUTION: This pitch analysis device for analyzing a pitch of a target signal mainly for signal analysis or signal encoding includes: a low pass filter 302 for limiting a frequency band of a target signal 301, and for outputting a transmission target signal whose frequency has been adjusted; a thinned-out correlation value calculation part 303 for extracting the signal value of a transmission target signal with a second sampling interval which is longer than a first sampling interval as the sampling interval of the target signal, and for calculating the auto-correction of the transmission target signal and the power of the transmission target signal; and a pitch determination part 304 for determining the pitch of the target signal on the basis of the calculated auto-correction and power.;COPYRIGHT: (C)2013,JPO&INPIT