Signal stretcher for envelope generator

Details Signal stretcher for envelope generator Signal stretcher for envelope generator

1980-10-30

1983-05-03

Kemeny, Emanuel S.

H04B 320

Patent

active

043821642

ABSTRACT:
A speech detector uses a signal classifier (19) to identify portions of a representation of the average magnitude of a group of signal samples indicative of either speech or noise. A controller (33) 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. A level estimator (21) uses selectively obtained signal measures from the defined portions of the representation to provide adaptively variable decision levels. A speech definer (16) 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 (133) to prevent adaptation of the transmit speech detector thresholds when echo signals are present.

REFERENCES:
patent: 3823275 (1974-07-01), LaMarche et al.
patent: 4005277 (1977-01-01), Araseki
patent: 4028506 (1977-06-01), Araseki
patent: 4029912 (1977-06-01), Geigel

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