1, easy to use. Noise-cancelling earphones are earphones designed to use some method to minimize disturbance. ANC Headphones ，Currently, noises-cancelling headphones are mostly split up into active sound-cancelling and indirect sound-cancelling.

2. The noise lessening theory is as follows:

(1) Very first, the reduced-frequency disturbance (100 ~ 1000Hz) from the environment that could be heard by the ear canal is detected with the transmission microphone placed in the earphone.

(2) The sound sign is then delivered to the control circuit, and the control circuit executes real-time operations.

(3) Play in the seem waves with the opposing cycle as well as the very same amplitude as the sound through Hi-Fi speaker systems to terminate the sound.

(4) After superposition, the noises vanishes and can not be heard.

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