Frequency-domain adaptive-filter acoustic echo canceller

Details Frequency-domain adaptive-filter acoustic echo canceller Frequency-domain adaptive-filter acoustic echo canceller

H - Electricity

04

M

H04M 1/60 (2006.01) G10K 11/178 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2186281

An echo canceller including an adaptive filter receiving the coefficients of a direct discrete transform in the frequency domain, said coefficients being calculated over a series of blocks in an input signal, and driving, via an inverse transform circuit, the substractive input of an adder for forming an output signal to the network, and a filter coefficient adapting circuit. Said canceller is characterised in that the adapting circuit receives the coefficients of the series of transforms for the output signal sample blocks via a noise reducer. The adapting circuit receives the coefficients of the series of transforms for the output signal sample blocks via a noise reducer.

L'annuleur d'écho comprend un filtre adaptatif recevant les coefficients d'une transformée directe discrète dans le domaine fréquentiel, calculés sur des blocs successifs d'un signal d'entrée, et attaquant, par l'intermédiaire d'un circuit de transformée inverse, l'entrée soustractive d'un additionneur de formation d'un signal de sortie allant vers le réseau, et un circuit d'adaptation des coefficients du filtre, caractérisé en ce que ledit circuit d'adaptation reçoit les coefficients des transformées successives des blocs d'échantillons du signal de sortie par l'intermédiaire d'un réducteur de bruit. Le circuit d'adaptation reçoit les coefficients des transformées successives des blocs d'échantillons du signal de sortie par l'intermédiaire d'un réducteur de bruit.

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