Speech detector with variable threshold

Details Speech detector with variable threshold Speech detector with variable threshold

1980-10-20

1982-09-28

Krass, Errol A.

179 1VC, G10L 104, H04B 1500

Patent

active

043519830

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 magnitude 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 M(t). This value is compared to a value M(t-1) which is the smallest value of M(t) from prior periods. The lesser of the two values is stored as the new value for M(t-1). The process is continued for i periods and at the end of the i.sup.th period, the value M(t-1) is multipled by a constant k and the product is stored as the threshold value for the next i periods of time t.

REFERENCES:
patent: 3700812 (1972-10-01), Springett
patent: 3832491 (1974-08-01), Sciulli et al.
patent: 3882458 (1975-05-01), Hoeschele, Jr. et al.
patent: 3909532 (1975-09-01), Rabiner et al.
patent: 4025721 (1977-05-01), Graupe et al.
patent: 4028496 (1977-06-01), La Marche et al.
patent: 4199729 (1980-04-01), Durand et al.

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