H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01)
Patent
CA 2231605
An echo cancelling system for communication systems. The system includes an adaptive filter (34) that processes the speech signal re-constructed by a speech decoder (30) to generate an echo estimate. The echo estimate is subtracted from the echo containing signal propagating in the communication link to remove or at least reduce the echo corruption. The tap coefficients of the adaptive filter are established on the basis of an error signal that is representative of difference between the echo estimate and the actual echo and on the basis of a signal element that is a component of the re-constructed speech signal. The signal element is highly decorrelated using a decorrelation filter (38) to enable the adaptive filter to converge faster and manifest an improved echo return loss enhancement.
L'invention a trait à un compensateur d'écho pour systèmes de communications. Ce compensateur comporte un filtre adaptatif (34) traitant le signal vocal reconstruit par un décodeur de la parole (30) afin de produire un écho synthétique. On soustrait ce dernier du signal contenant un écho se propageant dans la liaison de communication afin de supprimer totalement ou, à tout le moins partiellement, le phénomène d'altération dû à l'écho. On établit les coefficients de dérivation du filtre adaptatif en fonction d'un signal d'erreur représentatif de la différence existant entre l'écho synthétique et l'écho réel ainsi qu'en fonction d'un élément de signal, composante du signal vocal reconstruit. Un filtre de décorrélation (38) permet de décorréler notablement cet élément de signal afin de l'amener à converger rapidement et à faire preuve d'une amélioration d'accentuation d'atténuation du retour d'écho.
Nortel Networks Limited
Northern Telecom Limited
Smart & Biggar
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