Speech analysis apparatus, speech analysis method, and speech analysis program for detecting pitch frequency

摘要

The speech analysis apparatus of the present invention includes a speech acquisition unit, a frequency conversion unit, an autocorrelation unit, and a pitch detection unit. The frequency conversion unit converts the audio signal captured by the audio acquisition unit into a frequency spectrum. The autocorrelation unit obtains an autocorrelation waveform while shifting the frequency spectrum on the frequency axis. A pitch detection part calculates | requires a pitch frequency from the space | interval of the local peak of a self-correlation waveform, or a mountain, or a trough.