Echo canceler and echo path estimating method

Details Echo canceler and echo path estimating method Echo canceler and echo path estimating method

H - Electricity

04

B

H04B 3/23 (2006.01) H03H 21/00 (2006.01)

Patent

CA 2162570

The present invention relates to an echo canceler for training an echo path estimation without providing a hindrance to a speech. The echo canceler of the present invention includes a pseudo noise generator for generating a certain pseudo noise. This pseudo noise is forcibly supplied to a transmission line for transmitting a far-end talker's voice. Here, in the case where the far-end talker's transmitting speech level is faint or the far-end talker is in a speechless condition, a certain correlation is established between the pseudo noise and a signal of the transmission line for transmitting the near-end talker's voice. Based on such a correlation as just mentioned, a coefficient for generating an echo replica is calculated. Therefore, a training for estimating an echo path is performed based on the pseudo noise and without depending on the far-end talker's voice, thereby enabling to generate an appropriate echo replica.

Compensateur d'échos capable de réaliser un apprentissage de l'estimation de la trajectoire d'écho sans gêner les appels. Le compensateur d'échos est pourvu d'une section de génération d'un pseudo-bruit qui produit des signaux d'apprentissage (pseudo-bruits) spécifiques, lesquels sont délivrés de force à une ligne de transmission qui transmet la voix d'un correspondant éloigné. Lorsque le niveau de transmission du correspondant éloigné est très bas ou lorsqu'aucune voix n'est transmise, une certaine corrélation est établie entre le pseudo-bruit et le signal de la ligne de transmission. Des coefficients destinés à la production d'un pseudo-écho sont calculés sur la base de cette corrélation. L'apprentissage de l'estimation de la trajectoire d'écho est donc réalisé sur la base du pseudo-bruit, sans utiliser la voix du correspondant éloigné, et un faux écho approprié est produit

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