Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1984-01-30
1987-09-22
Shaw, Gareth D.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 500
Patent
active
046960414
ABSTRACT:
An utterance boundary detecting apparatus of this invention includes an acoustic processor for generating speech parameter time sequence data according to an input speech signal. The speech parameter time sequence data generated from the acoustic processor is delivered to a buffer memory and noise level determining circuit. The noise level determining circuit calculates the average value of speech parameter values of a background noise corresponding to a silent period when a speech signal is input as words uttered. The apparatus includes a threshold value calculating circuit for calculating an utterance boundary detection threshold value on the basis of an average value calculated by the noise level determining circuit. An utterance boundary detecting circuit generates utterance boundary data on the basis of the threshold value from the threshold value calculating circuit and speech parameter time sequence data in a buffer memory.
REFERENCES:
patent: 4277645 (1981-07-01), May, Jr.
patent: 4535473 (1985-08-01), Sakata
patent: 4597098 (1986-06-01), Noso et al.
"Discriminant and Least Squares Threshold Selection", Proc. 4th IJCPR (Kyoto), 1978, pp. 592-596.
Mills John G.
Shaw Gareth D.
Tokyo Shibaura Denki Kabushiki Kaisha
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