SPEECH ANALYZER DETECTING PITCH FREQUENCY, SPEECH ANALYZING METHOD, AND SPEECH ANALYZING PROGRAM

摘要

A speech analyzer comprises a speech acquiring section, a frequency converti ng section, an autocorrelation section, and a pitch detecting section. The frequency converting section converts the speech signal acquired by the spee ch acquiring section into a frequency spectrum. The autocorrelation section determines an autocorrelation waveform by shifting the frequency spectrum along the frequency axis. The pitch detecting section determines the pith frequency from the distance between two local crests or troughs of the autocorrelation waveform.