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Analysis of the working principle of noise reduction microphone

Author:admin   AddTime:2021-02-21

Nowadays, noise reduction microphone is a very practical technology, and because of this, many reviewers now compare the noise reduction level of different mobile phones horizontally. Let's follow Boros Technology to understand the working principle of noise reduction microphone.

The principle of the noise reduction microphone is not difficult to understand, because the location of the two microphones is different, and the collected audio signals are also different. To put it simply, the two microphones are one farther away from your mouth and the other closer. Those closer to your mouth will collect more vocals, and those farther away will collect more noise. The human voice collected by these two microphones generally has a volume difference (about 6 decibels), and the mobile phone processor uses the different sounds collected by the two microphones for processing, and automatically generates sound waves opposite to the noise for active use Cancel the noise. Generally speaking, when the sound wave of the noise is +5, the processor will give an instruction to make the noise reduction microphone emit a sound wave of -5, which is a positive and negative offset, so that the noise is filtered out.



Of course, the noise reduction microphone is easy to say, but it is more difficult to make it well. Because the mobile phone is inherently small, the noise reduction microphone and the main microphone cannot be too far apart. The noise reduction microphone may be useful while filtering noise. The sound is filtered out, so the hardware and filtering software algorithms are still very particular, and the test is also the skill of the mobile phone manufacturer. The noise reduction microphone should be as far away from the main microphone as possible. If the noise reduction microphone is not set in the opposite direction, but very close to your main microphone, then the two microphones receive the same content, and the noise reduction microphone will be impossible to talk about .

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