Method and apparatus for echo cancelling with double-talk...

Details Method and apparatus for echo cancelling with double-talk... Method and apparatus for echo cancelling with double-talk...

H - Electricity

04

B

H04B 3/23 (2006.01) H04M 3/18 (2006.01) H04Q 7/22 (2006.01)

Patent

CA 2167940

A method and apparatus are provided for echo canceling which includes double-talk immunity. The echo canceller (15) according to the present invention includes a double-talk detector (17) which uses an adaptive double- talk detection threshold (214) and an accurate estimation of reference energy (106) to detect double-talk. The echo canceller further provides for correcting partial echo canceller adaptive filter vector divergence occurring prior to double- talk detection by maintaining and switching to an auxiliary echo canceller filter with known "good" filter coefficients (58, 60, 62).

La présente invention concerne un procédé et un dispositif de suppression d'écho présentant une insensibilité à la superposition des signaux vocaux. Le suppresseur d'écho (15) de la présente invention comprend un détecteur de superposition des signaux vocaux (17) qui procède par seuil adaptatif de détection (214) de la superposition des signaux vocaux et estimation précise de l'énergie de référence (106) pour détecter la superposition des signaux vocaux. En outre, pour corriger partiellement la divergence vectorielle du filtre adaptatif se produisant avant la détection de superposition de signaux vocaux, le suppresseur d'écho maintient des coefficients de filtre connus comme étant "bons" (58, 60, 62) pour un filtre auxiliaire et commute sur ceux-ci.

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