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How Noise Cancellation earphone works?



Two types of noise cancellation method is used in earphone:
1.      Active Noise Cancellation.
2.      Passive Noise Isolation.

1.Active Noise Cancellation (ANC):

This type of technology is only available on high end headphone. ANC headphone use the microphone to capture the unwanted sound which can disturb the user experience.
According to amplitude of the unwanted sound the headphone produces the negative amplitude of the same sound. This combines with the first sound to form a new wave in a process called ‘interference', which effectively cancels out the sound going into your ears.

Furthermore, active noise cancellation works best when combined with good passive noise isolation. While you do get earphones with active noise cancellation, the reduced level of isolation makes this form of headset the least suited for the technology.

2.Passive Noise Isolation (PNI):

Another way to get ride of the unwanted noise but it completely different from the first method. ANC works on the noise reduction process and PNI works on noise blocking process which completely different. In PNI uses layer or padding to block sound. 

Passive Noise isolation is best on over-ear headphones, but can be effective even with on-ear headphones and earphones as well.

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