Pitch extraction apparatus for an acoustic signal waveform

Details Pitch extraction apparatus for an acoustic signal waveform Pitch extraction apparatus for an acoustic signal waveform

1989-06-12

1993-05-04

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 34, G10L 500

Patent

active

052088618

ABSTRACT:
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.

REFERENCES:
patent: 4063030 (1977-12-01), Zurcher
patent: 4443857 (1984-04-01), Albarello
patent: 4589131 (1986-05-01), Horvath et al.
patent: 4633748 (1987-01-01), Takashima et al.

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