Echo suppressor

Details Echo suppressor Echo suppressor

H - Electricity

04

M

379/64

H04M 3/18 (2006.01) H04B 3/20 (2006.01)

Patent

CA 1275335

Abstract: An echo suppressor for a communication system wherein a signal sent to a transmitting line is returned partly to a receiving line with some delay, comprises an attenuator for attenuating an amplitude of a receiving speech signal. The amplitude of a transmitting speech signal is compared with the amplitude of a receiving speech signal to generate a signal for controlling the attenuator according to the result of such comparison. The circuit controls the delay time until the attenuation control signal operates on the attenuator according to a change in the amplitude level of the receiving speech signal. This arrangement operates to hold the delay time normally at a predetermined maximum value and also to minimize the delay time when a change in amplitude of the receiving speech signal indicates the beginning of speech. Thus, an echo of speech uttered by a near end user can be suppressed without impairing the beginning of a speech signal uttered by a far end user.

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