The differences between Active Noise Canceling(ANC) headphon

Noise reduction headphones are headphones that use some method to reduce noise. There are two types of noise reduction headphones: active noise canceling(ANC) headphones and passive noise canceling headphones.

The active noise canceling function is to generate a reverse sound wave equal to the external noise through a noise reduction system, neutralize the noise, and thereby achieve the effect of noise reduction. Passive noise canceling headphones mainly form a closed space by surrounding the ear, or use silica gel earplugs and other soundproof materials to block external noise.

From the principle of noise reduction, passive noise reduction is filled with sponges in the ear cups, through the ear cups and sponges to isolate the noise. There is a certain requirement for the clamping force of the ear cups, if there is a gap between the small ear cups and the ears. The noise reduction effect will be much worse. Active noise reduction is to set a smart noise reduction chip in the ear cup. When the built-in pickup sensor of the earphone senses the noise of the outside world, the smart circuit generates a sound wave opposite to the outside noise to cancel the noise.

In terms of applications, passive noise reduction headphones can be used as labor protection headphones in factories, construction sites and other occasions. When working with a noise reduction headset, it is not easy to communicate with people next to you. Active Noise Cancelling Headphones can shield large noise while also sensing small sounds without affecting communication. They are generally used in military and airport applications.

In terms of noise frequency, passive noise reduction shields high-frequency noise, which is more suitable for some relatively regular noise reduction scenarios, and is achieved by stacking sound-insulating materials. But dealing with the environment is complex, and a lot of low-frequency resonance noise is in vain. Active Noise Reduction through microphone pickup, it can effectively deal with the noise of complex environments, such as the interior of the car, the cabin and other environments. So, under certain conditions, the advantage of active noise reduction is extremely obvious. Active noise reduction has obvious effects on the elimination of low-frequency noise signals, especially noises such as air conditioners and engines. Up to 25dB-30dB of ambient noise can be reduced. Compared to passive noise reduction, the effect of active noise reduction is more intelligent.

Here is one model of bluetooth wireless ANC head

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