Video teleconference audio echo control unit

Details Video teleconference audio echo control unit Video teleconference audio echo control unit

1978-09-27

1980-07-29

Tupper, Robert S.

179 1HF, H04B 320, H04M 908

Patent

active

042152526

ABSTRACT:
An audio echo control unit for a video teleconference system is provided with a suppression attack time which is a function of the microphone-to-audio speaker distance and a suppression hangover time which is a function of the room characteristics. Echo which results from a double-talk condition is eliminated by removing the break-in capability, and receive signal level modulation is eliminated by removing any variable loss devices from the transmission path.

REFERENCES:
patent: 3206559 (1965-09-01), Barney
patent: 3725612 (1973-04-01), Campanella et al.
patent: 3826878 (1974-07-01), Bendel
patent: 3937907 (1976-02-01), Campanella et al.
patent: 3985979 (1976-10-01), Durand et al.
patent: 4008376 (1977-02-01), Flanagan et al.
patent: 4049911 (1977-09-01), Schlaff et al.
patent: 4052562 (1977-10-01), Andersen
patent: 4115668 (1978-09-01), Skrovanek et al.

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