Noise reduction processing method and apparatus based on double microphones

Abstract

The invention relates to the technical field of communication, and particularly relates to a noise reduction processing method and apparatus based on double microphones. The method disclosed by the invention comprises the steps of acquiring distances respectively from the two microphones with a fixed relative position relationship to an active sound source; and according to the two distances, based on a receiving signal of at least one microphone, regulating a noise reduction mode. According to the noise reduction processing method and apparatus based on double microphones, which are provided by the invention, not only can the noise reduction mode be regulated according to the distances from two microphones to the active sound source and picked audio signal amplitudes of the active sound source, but also main and auxiliary microphones can be determined according to the distances from two microphones to the active sound source, and according to a difference condition between the audio signal amplitudes of the active sound source, which are picked by two microphones, the audio signal amplitudes picked by the two microphones are regulated, so that the difference between the audio signal amplitudes picked by the two microphones is in a preset range value, thereby avoiding the problems of no transmission sound, small transmission volume and the like and achieving effects of eliminating noise in the surrounding environment and improving conversation quality.

Description

【Technical field】 [0001] The present invention relates to the technical field of communication, in particular to a noise reduction processing method and device based on dual microphones. 【Background technique】 [0002] Some existing hand-held communication devices have adopted a dual MIC (microphone) noise cancellation method. The principle is: one of the main MICs is closer to the user's mouth, and the other auxiliary MIC is located on the back or top of the communication device. Keep as far away from the main MIC as possible; under normal circumstances, the signal amplitude of the ambient noise picked up by the main MIC and the auxiliary MIC is basically the same. After differential amplification, the signal of the ambient noise can be suppressed. The MIC is generally located on the lower edge of the communication device (it is close to the human mouth during a normal call), so that the amplitude of the useful voice signal picked up by the main MIC is significantly larger ...

AI Technical Summary

Problems solved by technology

[0003] It can be seen from the above that in the existing dual MIC noise reduction method, the positions of the main MIC and the auxiliary MIC are fixed, and the advance of noise elimination is that the useful signal amplitude picked up by the main MIC must be greater than that picked up by the auxiliary MIC. If the amplitude of the useful signal picked up by the main MIC is less than or equal to the amplitude of the useful signal picked up by the auxiliary MIC, it will not only make the noise canceling function invalid, but also may cause problems such as silent transmission and low volume of voice transmission

[0004] In actual use, the way the user holds the calling device will cause the amplitude of the useful signal picked up by the main MIC to be less than or equal to the amplitude of the useful signal picked up by the auxiliary MIC. In addition, due to the difference in sensitivity between the main MIC and the auxiliary MIC, there will be no difference in the useful signal amplitude picked up by the main MIC and the auxiliary MIC, resulting in the above-mentioned noise cancellation function. Problems such as failure, silent transmission, low volume of transmission, etc.

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