Echo cancellation method and device based on intercom system

Abstract

The invention discloses an echo cancellation method and device based on an intercom system, and the method comprises the steps: obtaining a far-end audio signal played by a loudspeaker, and storing the far-end audio signal in a first cache; acquiring a near-end audio signal input by the microphone, and storing the near-end audio signal into a second cache; circularly reading the first audio signaland the second audio signal with the time length of L from the first cache and the second cache respectively; performing linear filtering processing on the first audio signal and the second audio signal to obtain a residual signal; performing voice signal detection on the residual signal to obtain a step length coefficient of a linear filter and a rejection ratio coefficient of a nonlinear filter; and dynamically controlling the linear filter according to the step length coefficient, and dynamically controlling the nonlinear filter according to the suppression ratio coefficient. According tothe invention, in the voice communication process of the intercom system, effective elimination of echoes can be ensured, and the full duplex experience effect is greatly improved.

Description

technical field [0001] The invention relates to the technical field of sound processing, in particular to an echo cancellation method and device based on an intercom system. Background technique [0002] In the building intercom system, the voice call device is usually an embedded device, and the speaker mode is selected. The volume of the speaker in this mode is usually relatively high, resulting in a relatively large echo during the call, that is, when the intercom party speaks, you can clearly hear what you just said. If the echo is not eliminated, not only will the call quality and user experience be greatly reduced, but also an oscillating loop will be formed, resulting in harsh howling. [0003] At present, the existing software echo cancellation technology can usually achieve a better echo cancellation effect, but it introduces the problem of full duplex, that is, when the two sides of the intercom talk at the same time or alternately, the other party will not be abl...

AI Technical Summary

Problems solved by technology

[0004] (1) After the echo cancellation effect is debugged and stabilized, the duplex effect of the call is relatively poor, and there is a problem that the other party cannot hear or cannot hear clearly

[0005] (2) After the duplex effect is stabilized after debugging, there will be a problem that the echo converges too slowly. There is a large echo when the call is established, and it will take a long time to disappear slowly, which will affect the user experience.

[0006] (3) During the call, when the two parties speak at the same time or alternately, there will be a problem of hearing the other party's voice fluctuate

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