Apparatus for detecting the duration of voice

Details Apparatus for detecting the duration of voice Apparatus for detecting the duration of voice

1982-08-27

1985-08-13

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

358282, 382 51, G10L 100

Patent

active

045354731

ABSTRACT:
The detection of voice (speech) signal presence in input signal-plus-noise is improved by more accurate determination of the decision threshold, which is determined by first finding a medium-length interval consisting of noise-signal-noise (no-signal, signal, no-signal), then calculating a histogram (energy probability distribution) for the interval, then finding the maximum value of variance of the histogram as the optimal threshold, plus an arbitrary offset.

REFERENCES:
patent: 4272789 (1981-06-01), Biron
patent: 4351983 (1982-09-01), Crouse et al.
Dorr, et al., "Thresholding Method", IBM Tech. Disclosure Bull., vol. 15, No. 8, Jan. 1953, p. 2595.
Proceedings of the 4th International Joint Conference on Pattern Recognition pp. 592-596; "Discriminant and Least Squares Threshold Selection"; Nobuyuki Otsu; 1978.

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