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The working principle of smartphone noise reduction microphone

Author:admin   AddTime:2021-02-22

The function of the noise reduction microphone of the microphone noise reduction chip supplier's mobile phone, as the name suggests, the noise reduction microphone of the microphone noise reduction chip supplier is used to reduce the noise in the call, because the call is the basic function of the mobile phone, and the noise reduction level of the mobile phone directly determines the call quality. Many mobile phone evaluations regard the noise reduction level of the mobile phone as one of the evaluation items. Where is the noise reduction microphone? Pick up the phone, except for the microphone hole, slot hole and infrared hole at the bottom, the rest are basically noise-reducing microphone holes, usually on the back or top of the phone.

Many people want to know the working principle of noise reduction microphones for mobile phones from microphone noise reduction chip suppliers. In fact, it is very simple. Different microphone noise reduction chip suppliers have their own different noise reduction algorithms, but the basic principle of call noise reduction is the same. This technology is called dual microphone noise reduction technology, which is built into the mobile phone. Two microphones, one maintains a clear call, and the other actively eliminates noise physically. By collecting external noise, the microphone noise reduction chip supplier uses internal algorithms to process it and emits a sound wave opposite to the noise, using the principle of cancellation to eliminate noise .



Because the positions of the two microphones are different and their distances from the mouth are different, the lower main microphone receives strong human voice environmental noise, while the noise reduction microphone receives weak human voice environmental noise. During the call, the algorithm of the microphone noise reduction chip supplier will compare the sounds of the two in real time. If the sound is not different, it will be judged as noise and filtered out directly. If the sound difference is large, it is determined as the calling sound and kept.

It should be noted that the two microphones of the microphone noise reduction chip supplier must keep a certain distance and be isolated on the internal motherboard. The main microphone should be close to where people are talking. When the mobile phone makes a normal call, the main microphone collects the voice and background noise during the call to generate a louder signal. At the same time, the microphone noise reduction chip supplier's noise reduction microphone will also collect smaller sounds and background noise to generate another volume signal. The two signals are input to the noise reduction processor, and the input ends of the two signals are differential amplifiers, that is, the external noise collected by the two signals is cancelled and amplified to obtain the signal.

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