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

摘要

A speech analyzer according to the invention includes a voice acquisition unit, a frequency conversion unit, an autocorrelation unit, and a pitch detection unit. The frequency conversion unit converts a voice signal acquired by the voice acquisition unit into a frequency spectrum. The autocorrelation unit calculates an autocorrelation waveform while shifting the frequency spectrum on a frequency axis. The pitch detection unit calculates a pitch frequency based on a local interval between crests or troughs of the autocorrelation waveform.