Multi-channel echo cancelling method and a device thereof

H - Electricity – 04 – B

Patent

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Details

H04B 3/21 (2006.01) G10K 11/178 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2124662

The present invention relates to a multi-channel echo cancelling art enabling proper operation even if using a microphone not generating propagation delay difference between channels. The present invention comprises: a step of calculating a power of reception signal in each reception channel and selecting a reception channel of a reception signal having the biggest power; a step of generating an echo replica corresponding to an echo in each mixed signal generated by propagation of reception signals of the reception channels based on a reception signal of the reception channel selected in the previous step; and a step of cancelling the echoes from mixed signals in which the echoes are mixed by subtracting the echo replicas from the mixed signals.

Méthode de suppression d'écho multicanal, fonctionnant bien même si le microphone utilisé ne génère pas de différence de retard de propagation entre canaux. Comprend les étapes suivantes : calculer la puissance d'un signal de réception dans chaque canal de réception et sélectionner le canal de réception du signal qui a la plus grande puissance; générer une réplique d'écho correspondant à un écho dans chaque signal mixte généré par la propagation des signaux de réception des canaux de réception, à partir d'un signal de réception du canal de réception sélectionné à l'étape précédente; et supprimer les échos provenant de signaux mixtes dans lesquels les échos sont mélangés, en soustrayant les répliques d'écho des signaux mixtes.

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