Communication system howling suppression method and device

Abstract

The invention discloses a communication system howling suppression method and device. The method comprises the following steps: estimating an acoustic feedback suppression gain function according to respective sub-band spectrums of a preset reference signal and a microphone receiving signal; and after time domain transformation is carried out on the acoustic feedback suppression gain function, perfroming time domain filtering on the microphone receiving signal. According to the invention, the time domain filtering is carried out on the microphone receiving signal through the linear filter coefficient vector obtained through the time domain transformation of the estimated acoustic feedback suppression gain function, so that the suppression of the acoustic feedback signal in the microphone receiving signal is realized, and the suppression of the howling phenomenon is further realized.

Description

technical field [0001] The invention relates to the technical field of online meetings, in particular to a method and device for suppressing howling in a communication system. Background technique [0002] exist figure 1 In the communication system shown, when a conference client user A speaks, the received signal u(n) of its adjacent conference client user B passes through its loudspeaker and the spatial acoustic feedback path h1(n) inevitably Ground coupled to the microphone of conference client A of the calling party, thus forming figure 1 Closed loop 1 shown in ; in addition, the voice signal of the conference client user A when speaking will also be coupled to the microphone of user B through the spatial acoustic feedback path, and sent back to the user through B's transmission link and communication network transmission A's external loudspeaker is then coupled to B's microphone again to form another closed-loop loop. For simplicity, the closed-loop loop is figure 1 ...

AI Technical Summary

Problems solved by technology

However, the core requirement of this control scheme based on howling detection is to detect the howling phenomenon accurately and in time; however, the existing howling detection technologies all have the problems of false detection and lag detection

In the case of false detection, although the technical solution of mute processing is not harmful to the subsequent processing of the conference client, if the subsequent processing of the conference client adopts the wave limiting technical solution, it will be extremely harmful

On the other hand, the hysteresis detection problem of howling is a common defect in the existing howling detection technology, and there is no solution to overcome this defect at present; this defect will bring a very painful experience to the participants, because the howling It has already happened. It will take a certain amount of time when the conference client detects howling and starts subsequent processing until the howling finally disappears.

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