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What are noise cancelling headphones?
What are noise cancelling headphones
Noise cancelling earphones are a kind of earphones that can reduce noise, mainly divided into active noise cancelling and passive noise cancelling 1. The active noise cancelling headset realizes the noise reduction effect by generating reverse sound waves equal to the external noise in the noise cancelling system 3. Passive noise-cancelling headphones mainly surround the ear to form a closed space or adopt soundproof materials to block external noise 2. Noise-cancelling headphones can create a relatively quiet listening environment 4.
Noise cancelling headphones are divided into active noise cancelling headphones and passive noise cancelling headphones.
Active noise reduction:
Active noise reduction earphone is more complicated than ordinary earphone. It needs a built-in noise reduction module, including a microphone, which is used to accept external noise. After calculation of internal circuit, acoustic wave "inverting" with external noise is added when the earphone plays music, so as to cancel the noise, so that your ear can only hear the music itself, so as to achieve the effect of noise reduction.
Passive noise reduction
The most common types of headphones are in-ear plugs and large earmuffs, which can be classified as passive noise-cancelling headphones. If the noise reduction effect of the two is compared, generally speaking, the effect of active noise cancelling headphones is more obvious than that of passive noise cancelling headphones, and it is also praised by more users who pursue ideal noise reduction effect.