Echo cancellation method and echo canceller implementing...

Details Echo cancellation method and echo canceller implementing... Echo cancellation method and echo canceller implementing...

H - Electricity

04

R

H04R 3/02 (2006.01) H04M 1/20 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2227480

A reception signal (x(n)) is input to an echo generator system (1). An observation signal (z(n)) is gathered from the system. The reception signal is filtered to produce an echo prediction signal (y(n)). The echo prediction signal is subtracted from the observation signal to produce an error signal (e(n)). The observation signal (z(n)) is decomposed into M spectral components relating to different frequencies of the spectrum. M corresponding spectral components of the echo prediction signal (y(n)) are obtained. M quantities, each having a value with progressive variation representative of a degree of similitude between, respectively, one of the M spectral components of the observation signal and the corresponding spectral component of the echo prediction signal, are calculated. At least one spectral shaping of the error signal (e(n)) is carried out as a function of these M calculated quantities so as to adapt the filtering and/or to deliver the output signal from the echo canceller.

Un signal reçu (x(n)) est introduit dans un générateur d'échos (1). Un signal d'observation (z(n)) est extrait de ce système. Le signal reçu est filtré pour produire un signal de prévision d'écho (y(n)) qui est soustrait du signal d'observation pour produire un signal d'erreur (e(n)). Le signal d'observation (z(n)) est décomposé en M composantes spectrales correspondant aux différentes fréquences du spectre. On obtient ainsi M composantes spectrales correspondantes du signal de prévision d'écho (y(n)). M quantités sont calculées qui ont chacune une valeur à variation progressive représentant le degré de similitude entre l'une des M composantes spectrales du signal d'observation et la composante spectrale correspondante du signal de prévision d'écho. Au moins une forme spectrale du signal d'erreur (e(n)) est réalisée sous la forme d'une fonction de ces M quantités calculées pour adapter le filtrage et/ou pour fournir le signal de sortie de l'éliminateur d'échos.

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