Multi-channel echo cancellation with adaptive filters having...

H - Electricity – 04 – B

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H04B 3/23 (2006.01) H04M 3/18 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2088558

A multi-channel echo canceller comprises a set of subtractors connected respectively in communication channels for respectively receiving a signal from a respective microphone and cancelling an echo contained in it with a cancelling signal, and a set of adaptive filters associated respectively with the subtractors. Each adaptive filter has a set of vectors of filter coefficients. A time difference between propagation delays of the received signals is estimated, and a signal having the largest content of echo components is selected and applied to the adaptive filters. One of the coefficient vectors is identified according to the estimated time difference and the selected signal. Each adaptive filter varies its filter coefficients of the identified vector with a correction term proportional to the output of the associated subtractor for filtering the selected signal using the coefficients of the identified vector to derive an echo replica, which is supplied to the associated subtractor as the cancelling signal.

L'invention est un éliminateur d'échos multicanal comportant un ensemble de soustracteurs connectés à des canaux de communication distincts pour recevoir chacun un signal distinct provenant d'un microphone distinct et éliminer les échos dans ce signal à l'aide d'un signal d'élimination, et un ensemble de filtres adaptatifs associés chacun à l'un des soustracteurs. Chaque filtre adaptatif comporte un ensemble de vecteurs de coefficient de filtrage. La différence entre les temps de propagation des signaux reçus est évaluée et le signal comportant la plus grande concentration d'échos est sélectionné et transmis aux filtres adaptatifs. L'un des vecteurs de coefficient est choisi d'après la différence évaluée et le signal sélectionné. Chaque filtre adaptatif fait varier ses coefficients de filtrage correspondant au vecteur choisi en leur apportant une correction proportionnelle au signal de sortie du soustracteur connexe afin de filtrer le signal sélectionné en utilisant les coefficients du vecteur choisi pour obtenir un signal dupliquant l'écho, lequel est transmis au soustracteur connexe comme signal d'élimination.

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