Soundproof - 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:

    “I wonder about the trees.
    Why do we wish to bear
    Forever the noise of these
    More than another noise
    So close to our dwelling place?”
    —Robert Frost (1874–1963)