Method and apparatus for echo reduction in a hands-free cellular

Details Method and apparatus for echo reduction in a hands-free cellular Method and apparatus for echo reduction in a hands-free cellular

1995-01-19

1998-11-10

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 331, 379 59, 379390, H04B 146

Patent

active

058358510

ABSTRACT:
A method and apparatus for reducing the echo in a hands-free digital cellular communications system is presented. Acting upon speech signals being present in the downlink, uplink speech frames generated by the hands-free communication device are attenuated to prevent the downlink speech signals from being transmitted at full volume back on the uplink as an echo. Added to the attenutated uplink speech frame is a noise frame generated by the hands-free communication device, which provides a consistent level of background noise to the person at the other end of the call. The noise codeword is further randomly ordered to prevent any modulative effects from the process.

REFERENCES:
patent: 4965822 (1990-10-01), Williams
patent: 5222251 (1993-06-01), Roney, IV et al.

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