Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-08-24
1991-04-09
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 49, 381 38, G10L 918
Patent
active
050070932
ABSTRACT:
Statistically analyzing a discriminant variable generated by a discriminant voiced detector is done to determine the presence of the fundamental frequency in a changing speech environment. The detector is responsive to the discriminant variable to first calculate the average of all of the values of the discriminant variable over the present and past speech frames and then to determine the overall probability that any frame will be unvoiced. In addition, the detector calculates two values, one value represents the statistical average of discriminant values that an unvoiced frame's discriminant variable would have and the other value represents the statistical average of the discriminant values for voice frames. These latter calculations are performed utilizing not only the average discriminant value but also a weight value and a threshold value which are adaptively determined from frame to frame. The unvoiced/voiced decision is made by utilizing the weight and threshold values.
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AT&T Bell Laboratories
Kemeny Emanuel S.
Knepper David D.
Moran John C.
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