Echo suppression method and device

Abstract

The invention discloses an echo suppression method and device. The echo suppression method comprises the steps of suppressing linear echo component in a first audio signal to obtain a first echo suppression signal; suppressing nonlinear echo component in a second audio signal based on the first echo suppression signal to obtain a second echo suppression signal, wherein the first audio signal and the second audio signal are collected by audio receivers in an audio receiver array; and suppressing the linear echo component and the residual nonlinear echo component in the second echo suppression signal, respectively. The echo suppression method and device can efficiently suppress the linear and nonlinear acoustic echoes.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to an echo suppression method and device. Background technique [0002] For devices with communication functions such as mobile phones and tablet computers, hands-free calling is generally one of the required application features. For the hands-free call mode, the acoustic echo suppression technology is an important technology for improving the call quality, but the real-time change of the acoustic echo brings great technical challenges to the acoustic echo suppression technology. In the prior art, since the adaptive filter has the function of quickly tracking real-time changing signals in an unknown environment, it is usually used in the echo suppression technology to estimate the echo. [0003] Because the speakers on mobile phones and tablets are small and close to the microphone, and the sound from the speaker is usually loud in the hands-free mode, the echo signa...

AI Technical Summary

Problems solved by technology

This makes the existing monophonic acoustic echo suppressor implemented based on linear adaptive filter unable to effectively eliminate and suppress the acoustic echo of such communication equipment in the hands-free mode

[0004] For the nonlinear characteristics of acoustic echo of communication devices such as mobile phones in the hands-free mode, nonlinear echo suppressors are correspondingly used in some existing technologies, but these technical solutions have relatively low nonlinear residual echo components. When the nonlinear residual echo is suppressed, it will inevitably suppress and damage the near-end voice signal, especially when the amplitude of the nonlinear echo is equivalent to the amplitude of the near-end voice signal, the use of nonlinear echo suppression In the technical solution of the device, the near-end speech signal will be greatly damaged, and at the target receiving end, the received speech signal may even be completely distorted

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