A variable block size adaptation algorithm for noise-robust...

H - Electricity – 03 – H

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

Patent

CA 2174342

An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR (22) and continually adjusts the block size (20,26) to provide high noise immunity, thereby increasing the convergence speed of the filter and decreasing the asymptomatic mean-square error. An exemplary embodiment of the present invention is presented in the context of acoustic echo cancellation though it is noted that the adaptive filter of the present invention is useful in any environment in which the noise characteristics are subject to change.

Est décrit un appareil qui ajuste automatiquement la longueur des blocs d'adaptation pour un filtre adaptatif à erreur quadratique minimale, en fonction du rapport signal/bruit à l'entrée. L'appareil contrôle le rapport signal/bruit à l'entrée (22) instantané et ajuste en continu la longueur des blocs (20, 26) pour assurer une insensibilité élevée au bruit, augmentant ainsi la vitesse de convergence du filtre et diminuant l'erreur quadratique moyenne asymptotique. Un exemple de mode de réalisation de la présente invention est décrit dans le contexte de la suppression d'écho acoustique, toutefois il est à noter que le filtre adaptatif décrit est utile dans tout environnement où les caractéristiques de bruit sont susceptibles de varier.

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