Soundproofing - Noise Cancellation

Noise Cancellation

Noise cancellation generators for active noise control are a relatively modern innovation. A microphone is used to pick up the sound that is then analyzed by a computer; then, sound waves with opposite polarity (180° phase at all frequencies) are output through a speaker, causing destructive interference and cancelling much of the noise.

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Famous quotes containing the word noise:

    “Sweet bird, that shunn’st the noise of folly,
    Most musical, most melancholy!”
    —John Milton (1608–1674)