How do Bluetooth noise-cancelling headphones achieve noise reduction

Noise-cancelling headphones can make the environment for listening to music quieter, and only need a lower volume to hear the sound clearly, which makes the use experience comfortable and can effectively protect your hearing.

The noise reduction of noise-cancelling headphones includes passive noise reduction and active noise reduction.

Passive Noise Cancelling Headphones: It can be understood as covering your ears so that you cannot hear the noise. Generally speaking, the passive noise reduction effect of head-mounted noise-cancelling headphones is better, after all, they can completely cover the ears. The slightly worse is the in-ear type, the worst is the semi-in-ear type。

Active Noise Cancelling Headphones: This is mainly to collect noise in the environment through the radio microphone on the headphones, and then generate a reverse signal through the noise reduction module, and then send out reverse sound waves through the speaker to cancel the noise. The principle is very simple, but the implementation is very difficult. A combination of hardware and noise reduction algorithms is required to perfectly achieve active noise reduction.

Due to the complex structure and working principle of active noise cancelling headphones, the price is generally much higher. However, the shortcomings of active noise canceling headphones are also obvious. Since the sound unit will emit additional sound waves to cancel the noise, there will still be differences in the sound quality performance, and the sound details will be lost.

There are some Bluetooth audio modules of HYXKIOT support noise reduction, such as Bluetooth 5.2 Module F-6991.