Communication device with dynamic echo suppression and backgroun

Details Communication device with dynamic echo suppression and backgroun Communication device with dynamic echo suppression and backgroun

1996-05-31

1998-06-23

Crosland, Donnie L.

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 78, 379406, 379410, 381 83, 381 93, 381 94, 381 57, H04B 110, H04M 100

Patent

active

057714401

ABSTRACT:
Echo suppression is accomplished by comparing the ratio of the microphone (101) and speaker (121) energies to a dynamic threshold that varies with the background noise (310) at a second communication device (130), and transmitting locally generated noise when the potential for echo exists. The use of the dynamic threshold provides for echo suppression with significantly better doubletalk performance.

REFERENCES:
patent: 4165449 (1979-08-01), Vachon
patent: 5307405 (1994-04-01), Sih
patent: 5390250 (1995-02-01), Janse et al.
patent: 5434916 (1995-07-01), Hasegawa
patent: 5602913 (1997-02-01), Lee et al.

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