Method and device for reducing echoes, and communication equipment

Abstract

The invention discloses a method and device for reducing echoes, and communication equipment. The communication equipment is provided with at least two microphones, wherein the distance between the first microphone and a loudspeaker is greater than the distance between the second microphone and the loudspeaker. The method comprises the steps: carrying out the filtering of a first echo signal s1(t) and / or a second echo signal s2(t); obtaining a target signal d(t) corresponding to the first echo signal s1(t), and a reference signal r(t) corresponding to the second echo signal s2(t), wherein the first echo signal s1(t) is an echo signal generated when the loudspeaker plays a downlink signal x(t) picked by the first microphone, and the second echo signal s2(t) is an echo signal generated when the loudspeaker plays the downlink signal x(t) picked by the second microphone; carrying out the filtering of the reference signal r(t) through employing an adaptive filter, and obtaining a filtering signal y(t); solving the difference between the filtering signal y(t) and the target signal d(t), and obtaining and outputting a residual signal e(t). The method makes the most of the signal picked by the microphone closer to the loudspeaker. Compared with the prior art, the method is better in echo inhibition effect.

Description

technical field [0001] The present application relates to the technical field of echo, and more specifically, to a method, device and communication equipment for reducing echo. Background technique [0002] In the audio system, because of the existence of the signal reflection path, the echo interference is inevitable. Echo in audio communication includes electrical echo and acoustic echo. Electrical echo is caused by the reflection of signal energy generated by impedance mismatch; Including direct echo and indirect echo. Direct echo is the sound that goes directly to the microphone after being broadcast by the speaker, while indirect echo is the sound that is broadcast by the speaker and enters the microphone after one or more reflections through different paths (such as the house or any object in the house). Echo collection. The echo is transmitted back to the speaking end after being delayed by the channel and is heard by the speaker, which interferes with the audio at...

AI Technical Summary

Problems solved by technology

However, during hands-free communication, the structure loses its noise-reducing effect due to a change in the principle of noise-reduction

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