Wind noise suppression method for active noise reduction equipment

Abstract

The invention belongs to the technical field of active noise reduction, and discloses a wind noise suppression method for an active noise reduction device. The method first collects the RMS energy value of a feedforward noise reduction microphone, and sets a wind noise judgment threshold. The RMS energy value of the noise reduction microphone and the size of the threshold value are used to judge whether the parameter setting of the filter needs to be adjusted; RMS energy value; according to the relationship between the RMS energy value of the feedback noise reduction microphone in the new and old states, judge the effect of the parameter setting adjustment of the filter at the current moment, and determine the adjustment direction of the filter at the next moment. The present invention can ensure that the noise energy collected by the feedback noise reduction microphone will not become larger than before processing, which ensures the noise reduction effect, and at the same time well avoids the generation of new noise during the feedforward noise processing process in the wind noise environment, thereby Bring a better noise reduction experience.

Description

technical field [0001] The invention belongs to the technical field of active noise reduction, and relates to a wind noise suppression method of an active noise reduction device. Background technique [0002] At present, active noise reduction devices (such as active noise reduction headphones, etc.) mostly use a hybrid noise reduction mode to help users reduce external environmental noise to the greatest extent, and usually has a significant effect on steady-state noise. [0003] At present, the active noise reduction device in the feed-forward mixed mode usually has one or more feed-forward noise-cancelling microphones to collect the initial external ambient noise and send it to the feed-forward noise processing module for noise cancellation processing. [0004] Usually, the feedforward noise reduction system obeys the causal constraints, that is, the time when the external noise penetrates into the ear canal through the device is the time limit requirement for the feedfor...

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Problems solved by technology

[0005] However, the active noise reduction equipment of the above mode basically cannot effectively reduce noise for fast-changing noise such as wind noise, and it will cause some troubles to users when the wind speed is high, which is specifically reflected in:

[0006] Wind noise is not a steady-state noise, especially when the wind speed is fast, the feed-forward noise-canceling microphone will generate a larger signal than the normal ambient noise, and after the signal is amplified, the waveform will even disappear , generating a large number of harmonics, so that the control signal generated by the feedforward noise processing module will also contain related harmonics, but these harmonics will not be generated during the process of wind noise penetrating into the ear canal through the device, so the new Noise is transmitted to the wearer, thereby causing distress to the user

[0007] Although reducing the microphone amplification gain can effectively avoid waveform cancellation and harmonic generation, it will also seriously affect the feedforward noise reduction effect, thereby reducing the overall noise reduction of the device

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