Apparatus and method for canceling acoustic echoes including...

H - Electricity – 04 – M

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H04M 1/20 (2006.01) H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2211994

An echo canceling loudspeaker telephone includes a loudspeaker which produces a sound pressure wave in response to an input signal which is applied to an audio input. thereof. This sound pressure wave includes a desired linear component which is a linear function of the input signal, and an undesired non-linear component which is a non-linear function of the input signal, and the sound pressure wave is transmitted along an acoustic path. A microphone is positioned in the acoustic path and converts the sound pressure wave into an output signal. An echo filter is responsive to the input signal and generates an estimated echo signal. This echo filter includes a loudspeaker model which generates an estimate of the sound pressure: wave including an estimate of the linear component and an estimate of the non-linear component. This echo filter also includes an acoustic path model which generates an estimate of the acoustic path from the loudspeaker to the microphone. In addition, a subtractor subtracts the estimated echo signal from the output signal thereby reducing an echo portion of said sound signal.

Appareil téléphonique à haut-parleur compensateur d'échos comprenant un haut-parleur qui produit une onde de pression acoustique en réponse à un signal d'entrée appliqué à son entrée audio. Ladite onde de pression acoustique comprend une composante linéaire souhaitée qui est une fonction linéaire du signal d'entrée, et une composante non linéaire indésirable qui est une fonction non linéaire du signal d'entrée; l'onde de pression acoustique est transmise le long d'un trajet acoustique. Un microphone est positionné dans ce trajet acoustique et convertit l'onde de pression acoustique en un signal de sortie. Un filtre d'échos est sensible au signal d'entrée et génère un signal d'écho estimé. Ce filtre d'échos comprend un modèle de haut-parleur qui génère une estimation de l'onde de pression acoustique comportant une estimation de la composante linéaire et de la composante non linéaire. Ledit filtre d'échos comporte également un modèle de trajet acoustique qui génère une estimation du trajet acoustique entre le haut-parleur et le microphone. De plus, un soustracteur soustrait le signal d'écho estimé du signal de sortie, réduisant ainsi une partie d'écho dudit signal sonore.

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