Echo cancelling system suitable for voice conference

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

H - Electricity

04

B

H04B 3/23 (2006.01) H04M 3/56 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2162538

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 i s 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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