Adaptive speech signal detector

Details Adaptive speech signal detector Adaptive speech signal detector

1978-04-12

1979-09-11

Claffy, Kathleen H.

179 1VC, 179 1HF, H04J 600

Patent

active

041676530

ABSTRACT:
An adaptive speech signal detector for use in a 4-wire telephone channel performs an adaptive threshold value setting operation depending on the channel noise level on a transmitter-side channel to detect a speech signal present at the transmitter. The adaptive operation of the speed signal detector is inhibited, however, if the signal level at the related receiver-side channel becomes higher than a preset value. This permits the use of the adaptive speech signal detector with DSI (digital speech interpolation) systems without malfunction due to the operation of an echo suppressor.

REFERENCES:
patent: 3970786 (1976-07-01), Randmere
patent: 4028496 (1977-06-01), La Marche et al.

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