Echo canceller employing dual-h architecture having improved...

Details Echo canceller employing dual-h architecture having improved... Echo canceller employing dual-h architecture having improved...

H - Electricity

04

B

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

Patent

CA 2307845

An echo canceler circuit (25) for use in an echo canceller system is set forth. The echo canceller circuit (25) comprises a first digital filter (35) having non-adaptive tap coefficients to simulate an echo response occurring during a call. A second digital filter (30) having adaptive tap coefficients to simulate an echo response occurring during the call is also used. The adaptive tap coefficients of the second digital filter (30) are updated over the duration of the call. A coefficient transfer controller is disposed in the echo canceller circuit (25) to transfer the adaptive tap coefficients of the second digital filter to replace the tap coefficients of the first digital filter when a value, E(~), is greater than a value E(-), and concurrently, when E(~) is greater than a value, E(sub max). The value of E(-) corresponds to the ratio between the signal-plus-echo signal and a second echo compensated signal using the second digital filter.

L'invention concerne un circuit compensateur d'écho (25) destiné à être utilisé dans un système compensateur d'écho. Ce circuit compensateur d'écho (25) comporte un premier filtre numérique (35) présentant des coefficients de prise non adaptatifs permettant de simuler une réponse écho survenant durant un appel. Il utilise également un second filtre numérique (30) présentant des coefficients de prise adaptatifs permettant de simuler une réponse écho survenant durant l'appel. Les coefficients de prise adaptatifs du second filtre numérique (30) sont mis à jour au cours de l'appel. Un contrôleur de transfert de coefficient est placé dans le circuit compensateur d'écho (25) de façon à transférer les coefficients de prise adaptatifs du second filtre numérique afin de remplacer les coefficients de prise du premier filtre numérique lorsqu'une valeur, E, est supérieure à une valeur, E-barre, et, également, lorsque E est supérieure à une valeur, E max. La valeur de E-barre correspond à un rapport entre le signal signal-plus-écho et un second signal à compensation d'écho utilisant le second filtre numérique.

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