Echo cancelling system suitable for voice conference

Details Echo cancelling system suitable for voice conference Echo cancelling system suitable for voice conference

1995-11-09

1998-04-07

Brown, Thomas W.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379406, H04M 160, H04M 908

Patent

active

057374082

ABSTRACT:
An echo cancelling system has two echo cancellers for cancelling a channel echo and a room echo, respectively. In order to obviate echo estimation errors, the echo canceller at the channel side performs estimation only when an input signal from a channel is absent and a microphone input signal is present. The echo canceller at the room or acoustic side executes estimation only when a microphone input signal is absent and an input signal from the channel is present. A necessary amount of suppression is applied to either the receipt side or the transmission side until the echo canceller estimates an echo, so that a howling margin is guaranteed.

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Casar Corredera et al., "A System for Acoustic Echo Control," Signal Processing V: Theories and Applications, Proceedings of EUSIPCO-90, vol. III, Barcelona, Spain, Sep. 18-21, 1990.

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