| 摘要 |
Echo suppression control device in a voice communication system wherein a reference signal is sent over the system from a transmitting apparatus and comprising an echo canceller (16) for removing any echo signal from a primary signal received by the transmitting apparatus, and a residual echo suppressor (20) for removing the residual echo at the output of the echo canceller. The residual echo suppressor comprises means (24) for identifying speech echo intervals during which the primary signal contains mainly echo of the reference signal, and a gain control unit (22) for computing an estimation of the residual echo level, computing a target level of the residual echo and computing a suppression gain G to be applied during the speech echo intervals to the residual echo signal obtained after the application of the echo canceller, this suppression gain being the ratio between the target residual echo and the residual echo level estimation.
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