Speech detector with variable threshold

Details Speech detector with variable threshold Speech detector with variable threshold

H - Electricity

04

J

363/1, 179/5, 35

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

Patent

CA 1130920

SPEECH DETECTOR WITH VARIABLE THRESHOLD Abstract A speech activity detection circuit and method are described in which a digitized sample of the analog speech signal in a communications system is taken n times in a period of time t. The magni- tude M of each sample is calculated and the largest value of M which is encountered over a given period t is stored as a peak magnitude ?(t). This value is compared to a value ?(t-1) which is the smallest value of ?(t) from prior periods. The lesser of the two values is stored as the new value for ?(t-1). The process is continued for i periods and at the end of the ith period, the value ?(t-1) is multiplied by a constant k and the product is stored as the threshold value for the next i periods of time t. Thus, the largest signal sample magnitude over a period of time t becomes, upon multiplication by constant k, the candidate "standard" threshold level for determining whether speech exists. If this candidate is smaller than the previously stored value for a previous period of time, then the candidate becomes the new standard. In this manner, the threshold level effectively floats or varies with the conditions of the incoming signal. RA9-78-003

343335

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