How does the mobile phone microphone eliminate environmental noise| Love to play computer games - 上海419贵族宝贝-上海后花园1314-上海品茶网-阿拉爱上海

With the development of technology, even in a very noisy environment, the other party who answers the phone can hear clearly, which is mainly due to the development of mobile phone noise reduction technology. In today's mobile phones, we often see that there is not only one microphone, but also two or even three microphones, and these are the key to noise reduction of mobile phones. How is this technology implemented? Let's get to know.

Generally speaking, for mobile phones with dual microphone noise reduction, we can see that there is one microphone at the top and one microphone at the bottom of the phone. The two microphones look very small, but their functions are obviously different. The microphone at the bottom is used to provide clear calls, and the microphone at the top is used to eliminate noise.

The principle is that the distance between the top and bottom of the microphone and the sound source is not the same during the call. In a word, the distance from the mouth is different, so the volume picked up by the two microphones is different. Using this difference, we can filter out the noise and retain the voice.

When making a call, the background noise volume picked up by the two microphones is basically the same, while the recorded voice will have a volume difference of about 6dB. After collecting the noise, the top microphone can be used to eliminate the noise after decoding to generate a compensation signal.

Although the top says that the amount of human voice picked up is small, it will more or less eliminate some of the voice in the process of processing. So we will lower our volume in a quiet environment. In addition to dual microphone noise reduction, we also see 3-microphone noise reduction in iPhone 5. The principle of this technology is basically the same, except that the effect of noise reduction will be better. In addition, in the noise reduction technology of motorcycles, they also have built-in hardware modules that can store some recorded environmental noise, so that noise can be attenuated more quickly and accurately.