Method and apparatus for reducing residual far-end echo in...

Details Method and apparatus for reducing residual far-end echo in... Method and apparatus for reducing residual far-end echo in...

H - Electricity

04

B

H04B 3/23 (2006.01) H04B 3/21 (2006.01)

Patent

CA 2189489

A method and apparatus are described for reducing, in communication signals received by a local network from a remote network (FAR-IN signals), thatenergy content that is attributable to echoes of signals transmitted into the local network (NEAR-IN signals). This is achieved, in part, by generating a time-varying TEMPLATE signal which represents the smoothed energy content of NEAR-IN signals delayed according to the echo path and attenuated by an estimated echo transmission loss. A non-linear processor passes the FAR-IN signal substantiallywithout attenuation if it exceeds the TEMPLATE, but attenuates the FAR-IN signalif it lies within a defined range below the TEMPLATE.

L'invention est constituée par une méthode et un appareil servant à réduire, dans les signaux de communication transmis d'un réseau éloigné (signaux FAR-IN) à un réseau local, l'énergie due aux échos des signaux reçus au réseau local (signaux NEAR-IN). Cette réduction est obtenue en partie en produisant un signal TEMPLATE variable avec le temps qui représente l'énergie moyenne de signaux NEAR-IN retardés selon le trajet des échos et affaiblis selon l'affaiblissement évalué pour la propagation de ces échos. Un processeur non linéaire transmet le signal FAR-IN essentiellement sans affaiblissement si celui-ci est plus fort que le signal TEMPLATE, mais le transmet en l'affaiblissant s'il se trouve dans une gamme prédéfinie au-dessous du niveau du signal TEMPLATE.

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