Noise cancel headphone reduce unwanted ambient sounds (i.e., acoustic noise) by means of active noise control (ANC). Essentially, this involves using a microphones, placed near the ear, and electronic circuitry which generates an "antinoise" sound wave with the opposite polarity of the sound wave arriving at the microphones. This results in destructive interference, which cancels out the noise within the enclosed volume of the headphones.
Rea More Noise Cancel Headphone
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