Narrow band tone detection in echo canceling system

Details Narrow band tone detection in echo canceling system Narrow band tone detection in echo canceling system

H - Electricity

04

B

H04B 3/23 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 2494386

The present invention relates generally to tone detection in echo canceling systems, and more particularly to a method of monitoring oscillations of adaptive filter coefficients for narrow band tone detection in echo cancellation systems. The invention is directed at improving communication in a telephone communication network having one or more hybrid connections. A method for detecting continuous tones in an echo canceling system having an adaptive filter is provided. Continuous tones have a deleterious effect on the performance of adaptive filters. In the present invention, the adaptive filter coefficients are monitored. Oscillation of those coefficients indicates continuous tone presence.

La présente invention se rapporte en général à la détection de tonalités dans les systèmes de suppression d'écho, et plus particulièrement, à une méthode qui permet de contrôler les oscillations des coefficients des filtres adaptatifs pour la détection de tonalités en bande étroite des systèmes de suppression d'écho. Cette invention vise à améliorer la communication dans un réseau de télécommunication téléphonique comportant un ou plusieurs branchements hybrides. Cette invention fournit une méthode qui permet de détecter les tonalités continues d'un système de suppression d'écho pourvu d'un filtre adaptatif. Les tonalités continues ont un effet nuisible sur la performance des filtres adaptatifs. La présente invention fait appel au contrôle des coefficients des filtres adaptatifs. L'oscillation de ces coefficients indique la présence continue de tonalités.

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