Noise reduction principle of bluetooth headset

According to the principle, the noise reduction of Bluetooth headset can be divided into three types.

Passive noise reduction

Passive noise reduction refers to the in-ear earplug, which is inserted into the ear through the silicone sleeve, so it has a good effect of isolating external sound. Moreover, this noise reduction is all-frequency, that is, it is effective for sounds from 20hz to 20000hz, and this static noise reduction is lossless in sound quality.

Call noise reduction

The purpose of call noise reduction is to make both parties hear clearly when using Bluetooth headsets. Common CVC noise reduction such as Qualcomm. Its principle is to use the chip inside the Bluetooth headset to filter the signal received by the microphone to reduce the external wind noise. At the same time, it can also weaken the echo of the call source sent by the other party.

Active noise reduction

Active noise reduction means that in some specific occasions, such as high-speed rail/aircraft, a word of regular external noise (aircraft engine noise) is collected through a pickup microphone. Through the circuit or algorithm, the reverse noise signal is added to the music signal, that is to say, the sound heard by the human ear and the external noise are directly offset, so as to achieve the effect of noise reduction.