Wind noise suppression method and device based on multiple microphones

Abstract

The invention discloses a wind noise suppression method and device based on multiple microphones. The method comprises the following steps that S1, microphone signals are selected to be output according to the low-frequency energy of all microphones; s2, suppressing the wind noise frequency point of the output microphone signal according to the energy magnitude relationship between each frequency point of the output microphone signal and each frequency point of other microphone signals; and S3, carrying out difference on signals of the main microphone and other microphones, taking low-frequency signals to carry out wind noise detection and wind noise magnitude estimation, and carrying out wind noise suppression in combination with a wind noise continuity characteristic.

Description

technical field [0001] The present invention relates to the technical field of audio signal processing, and in particular, to a method and device for suppressing wind noise based on multiple microphones. Background technique [0002] When communication equipment or recording equipment is used outdoors, it will inevitably be affected by wind noise, which reduces the clarity of sound pickup. Wind noise suppression is generally divided into two methods: active and passive: passive wind noise suppression is to cover the windshield outside the microphone to reduce the wind speed entering the microphone, thereby reducing the wind noise energy collected by the microphone; active wind noise suppression is to reduce the wind noise energy collected by the microphone. Wind noise is detected, estimated and suppressed on the collected digital signal. Generally speaking, active wind noise suppression is more likely to cause the loss of the target audio signal than passive wind noise supp...

AI Technical Summary

Problems solved by technology

[0004] The wind noise signal between multiple microphones is very different from other audio signals: because the wind noise is generated by the direct push of the gas flow to the microphone membrane, for different microphones, wind noise generally does not occur at the same time, even if the same time In the presence of wind noise, the amplitude and phase information of multiple wind noises are also difficult to be consistent. For this, there are two methods for wind noise suppression between multiple microphones: one can use the correlation between microphones to detect wind noise and Inhibition, but the correlation will use more multiplication and division operations, the calculation amount is relatively large, and the correlation will use the smoothing operation, resulting in the estimation of wind noise is not timely enough to affect the detection and suppression effect; Multiple microphones can be placed in different directions, so that the probability of wind noise appearing on all microphones at the same time is small, and the microphone with less wind noise can be selected as the algorithm output. This method can not only reduce the influence of wind noise, but also almost The target signal is not lost. The disadvantage is that as the number of microphones decreases, the wind noise suppression effect will become worse, and the requirements for the direction of the microphones limit the use of this method, and frequent switching of the output microphone signal will inevitably affect the sense of hearing.

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