Method, device and communication equipment for reducing echo

Abstract

The present application discloses a method, device and communication equipment for reducing echo. The communication equipment is provided with two microphones, wherein the distance between the first microphone and the speaker is greater than the distance between the second microphone and the speaker. The method includes: the first echo signal s 1 (t) and / or the second echo signal s 2 (t) Filtering processing is performed to obtain the first echo signal s 1 (t) corresponds to the target signal d(t), and the second echo signal s 2 (t) The corresponding reference signal r(t), wherein the first echo signal is the echo signal generated when the speaker picked up by the first microphone plays the downlink signal x(t), and the second echo signal is played by the speaker picked up by the second microphone The echo signal generated when the downlink signal x(t) is filtered by the adaptive filter to the reference signal r(t) to obtain the filtered signal y(t), and the filtered signal y(t) and the target signal d(t) are calculated difference, get the residual signal e(t), and output it. The method of the present application makes full use of the signal picked up by the microphone relatively close to the loudspeaker, and compared with the prior art, the echo suppression effect is better.

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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