Method for eliminating acoustic echo in a communication device

Details Method for eliminating acoustic echo in a communication device Method for eliminating acoustic echo in a communication device

1992-04-27

1993-06-22

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 501, 455 673, 455296, 379392, 379410, H04B 7015

Patent

active

052222519

ABSTRACT:
The process of the present invention operates on the voice codewords transmitted in a digital cellular radiotelephone environment. The process first determines if a voice is active (201) on the communications path from the base station to the radiotelephone. If a voice is present, a threshold is calculated (202). Any signals on the reverse path from the radiotelephone to the base station that are below this threshold (203) are replaced by noise that is at the same level as the ambient noise (204).

REFERENCES:
patent: 4829523 (1989-04-01), Bretl
patent: 4843621 (1989-06-01), Potratz
K. Pohlmann, Principles of Digital Audio, 1985, pp. 69,72.

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