Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
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.
Kemeny E. S. Matt
Tokyo Shibaura Denki Kabushiki Kaisha
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