Method and apparatus for judging voiced and unvoiced conditions

Details Method and apparatus for judging voiced and unvoiced conditions Method and apparatus for judging voiced and unvoiced conditions

1976-06-01

1978-02-14

Claffy, Kathleen H.

G10L 100

Patent

active

040740692

ABSTRACT:
The voiced and unvoiced conditions of a speech signal are judged by combining a ratio (defined as the parcor coefficient k.sub.1) .phi.(.tau.s)/.phi.(o) between the value .phi.(o) of the autocorrelation function of the speech signal at a zero delay time, and the value .phi.(.tau.s) of the autocorrelation function at a delay time .tau.s of the sampling period with a parameter extracted from the speech signal by a correlation technique and representing the degree of periodicity (P.sub.m) of the speech signal. By comparing the result of the combination against a predetermined threshold it can be determined whether the speech signal is in a voiced condition or in an unvoiced condition.

REFERENCES:
patent: 3662115 (1972-05-01), Saito
patent: 3740476 (1973-06-01), Atal
W. Hess, "On-Line Digital Pitch Period Extractor," International Zurich Seminar, Mar., 1974, (IEEE Publ.).
W. McCray, "Pitch Period Detection," IBM Tech. Disclosure Bulletin, vol. 16, No. 4, Sep., 1973.
M. Sondhi, "New Methods of Pitch Extraction," IEEE Trans. Audio, vol. AU-16, No. 2, Jun. 1968.

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