Speech signal detector having adaptive threshold values

Details Speech signal detector having adaptive threshold values Speech signal detector having adaptive threshold values

G - Physics

10

L

354/50

G10L 11/02 (2006.01)

Patent

CA 1220283

ABSTRACT The invention is a speech signal detector of simple construction which has threshold values adapted to the fluctuating level of noise contained in input speech signals. The invention comprises an absolute value detector for detecting the absolute value of each of the input signals; a noise power detector for calculating from the output of the absolute value detector the noise power contained in each input signal; a first threshold value setting circuit for generating a first threshold value from the output of the noise power detector circuit; a level detector for comparing the output of the absolute value detector and the threshold value supplied by the first threshold value setting circuit; an accumulating circuit for accumulating the outputs of the level detector; a comparator for comparing the output value of the accumulating circuit and a second threshold value; a hangover timer for giving a hangover time in response to the output of this comparator; and a second threshold value setting circuit for altering the second threshold value in response to the output of this hangover timer and supplying the altered second threshold value to the comparator.

461841

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