Method and apparatus for cancelling echo originating from a...

H - Electricity – 04 – M

Patent

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

Patent

CA 2312722

A novel method and apparatus are disclosed for cancelling echoes originating from a digital mobile handset using an echo canceller (10) located in the network. The method and apparatus thus solve a practical echo problem that many mobile telephone operators have long been faced with. The method includes an algorithm that differs significantly from a conventional network echo canceller algorithm, because of the following basic considerations that influenced a solution to the echo problem: (I) the algorithm should not worsen speech quality for digital mobiles that do not generate echoes (30); and (2) the echo path is non-linear due to two speech coder/decoder pairs in the echo path and a low echo level (38).

Cette invention concerne une technique et un appareil d'un type nouveau qui permettent de supprimer les échos provenant d'un téléphone mobile numérique au moyen d'un annulateur d'écho (10) implanté dans le réseau. Se trouve ainsi résolu un problème pratique d'écho auquel de nombreux opérateurs de téléphones mobiles sont depuis longtemps confrontés. Cette technique fait appel à un algorithme qui diffère sensiblement d'un algorithme classique d'annulateur d'écho compte tenu des considérations fondamentales suivantes prises en compte pour cette solution: (1) l'algorithme ne doit pas compromettre la qualité vocale des appareils mobiles non générateurs d'échos (30); et (2) le trajet d'écho n'est pas linéaire grâce à la présence de paires de codeurs-décodeurs à double parole dans le trajet de l'écho et d'un faible niveau (38) d'écho.

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