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MEMS microphone has the advantages of high reliability, high stability, high consistency, low defect rate and low repair rate. The capacitive silicon microphone chip mainly includes a thin and elastic diaphragm and a rigid back plate, the back plate and the diaphragm form a parallel plate capacitor; the diaphragm will be displaced under the action of sound pressure, and the plate voltage will change with the movement of the diaphragm, thus converting the acoustic signal into an electrical signal.
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The vibration signal generated by the vocal cords is transmitted in two ways: one is to spread outward through the air medium, and the other is to spread outward through the human brain bone and muscle, causing the vibration of the auricle. The bone vibration sensor is to use the latter mode of transmission to detect the vibration signal of the auricle and pick up the wearer's voice information. The bone vibration sensor is not sensitive to the sound wave signal transmitted in the air, and has a natural suppression effect on the sound signal transmitted in the air. Therefore, the call noise reduction algorithm is simpler and more natural, and the noise suppression is more effective, which can provide better uplink call effect
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