ACOUSTIC INTERVAL DETECTION METHOD AND DEVICE

摘要

There is provided a harmonic-structured acoustic signal interval detection device not depending on the level fluctuation of the input signal, having an excellent real time characteristic, and noise resistance. The device includes: an FFT section (200) for subjecting the input signal to FFT and calculating a power spectrum component for each frame; a harmonic structure extraction section (201) for leaving only the harmonic structure from the power spectrum component; a voiced feature evaluation section (210) for evaluating correlation between the frames of harmonic structure extracted in the harmonic structure extraction section (201), thereby evaluating whether the interval is a vowel interval and extracting the voiced feature interval; and a speech interval decision section (205) for deciding a speech interval according to the continuity and durability of the output of the voiced feature evaluation section (210).