System and method for controlling a filter to enhance...

H - Electricity – 04 – M

Patent

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H04M 9/08 (2006.01) H04M 1/60 (2006.01)

Patent

CA 2473006

In a speakerphone system, the signal that is directed to a loudspeaker is filtered by a dynamically controllable highpass filter. The filter characteristics are adjusted on the basis of the power of the signal and the degree of recent microphone activity. The filtered signal is a far-talker signal, while the microphone activity is represented as a near-talker signal that includes an echo component as a consequence of loudspeaker-to-microphone coupling. The degree of microphone activity is determined by a subband analyzer. A noise floor estimator may be used to determine the degree to which the near-talker signal is comprised of background noise, so that the noise can be eliminated in the process of controlling the highpass filter

Dans un système de poste téléphonique à haut-parleur (46; et 70), le signal dirigé vers un haut-parleur (58) est filtré par un filtre passe-haut (50) à commande dynamique. Les caractéristiques du filtre sont réglées sur la base de la puissance du signal et du degré d'activité (62) récente du microphone. Le signal filtré est un signal transmetteur à distance, alors que l'activité du microphone est représentée comme un signal transmetteur proche comprenant un composant écho résultant du couplage entre le haut-parleur et le microphone. Le degré d'activité du microphone est déterminé par un analyseur de sous-bandes (78). On peut utiliser un estimateur (82) de plancher de bruit pour déterminer le degré de bruit de fond que comprend le signal transmetteur proche, de manière à éliminer le bruit lors du procédé de commande du filtre passe-haut.

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