| 摘要 |
A pitch extraction apparatus for extracting (detecting)a pitch of an acoustic signal which includes circuitry for calculating the stability of the acoustic signal. The stability calculation exhibits a larger value as the amplitude of the acoustic signal is larger and when the frequency is low. Pitch extraction is performed using the calculated stability. In addition, a pitch extraction apparatus which includes a pitch extractor for extracting a pitch of an acoustic signal by discriminating whether or not an input is a voiced or voiceless sound. Based on the determination that the input is a voiceless sound, the input to or the output from the pitch extractor will be inhibited.
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