Double talk detector for echo cancellers

Details Double talk detector for echo cancellers Double talk detector for echo cancellers

1979-09-05

1982-11-23

Konick, Bernard

1791706, H04B 320

Patent

active

043607128

ABSTRACT:
Three double talk detectors (DTD) are used in combination with an echo canceller having an adaptive filter and a center clipper. First and second double talk detectors are used in the presence of double talk to selectively freeze the adaptive filter correction loop and to disable the center clipper. The third double talk detector is used to detect the initial adaptive period of the echo canceller. Control of the adaptive filter and clipper is effectively transferred from the first to the second double talk detector upon termination of the initial adaptive period as determined by the third double talk detector. The third double talk detector also detects a false double talk condition (where the distant talker pauses in speech) and overrides the second double talk detector in order to maintain the clipper in an active state.

REFERENCES:
patent: 3894200 (1975-07-01), Campanella et al.
patent: 3992594 (1976-11-01), Helder
patent: 4005277 (1977-01-01), Araseki et al.
patent: 4029912 (1977-06-01), Geigel et al.
patent: 4129753 (1978-12-01), Duttweiler

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