3.6 Wind noise resistant microphone design
When the microphone is used outdoors, it is often affected by the wind to make the microphone diaphragm produce noise. Because wind-shear noise is a low-frequency pressure wave, it will cause the microphone to the diaphragm to move to the limit greatly, and it is easy for the microphone to enter the non-linear working area. The microphone signal output produces a clipping or distorted signal, which degrades the quality of the call. To reduce the occurrence of this phenomenon, the microphones of consumer products are usually not like professional equipment. They use bulky windshield equipment to filter out wind-shear noise. While, we usually put a sponge as noise-canceling material that is placed in front of the microphone's sound hole, so it can be filtered and also attenuation the wind-shear simultaneously (Fig.6.1)
or using the microporous structure company with the sponge as the noise-canceling method (Fig.6.2), it can also achieve a good anti-wind noise effect (Fig.6.3).