Multiple variable threshold speech detector

Details Multiple variable threshold speech detector Multiple variable threshold speech detector

H - Electricity

04

M

179/5, 379/64

H04M 3/18 (2006.01) H04B 3/20 (2006.01) H04J 3/17 (2006.01)

Patent

CA 1158174

MAY, C. J. JR. 16 -25- MULTIPLE VARIABLE THRESHOLD SPEECH DETECTOR Abstract of the Disclosure A speech detector uses a signal classifier to identify portions of a representation of the average magnitude of a group of signal samples indicative of either speech or noise. A controller in the signal classifier follows a four state sequence using appropriate time constants for signal measures in a variety of signal conditions in defining the speech and noise portions of the representation to provide adaptively variable decision levels. A speech definer compares the representation to a first decision level and the signal samples to a higher decision level to indicate the occurrence of speech signal activity when either decision level is exceeded. In a two way transmission arrangement, a receive trunk speech detector uses a stretcher to prevent adaption of the transmit speech detector thresholds when echo signals are present.

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