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:

    “Speak, ye that ride on white asses, ye that sit in judgment, and walk by the way.
    They that are delivered from the noise of archers in the places of
    drawing water, there shall they rehearse the righteous acts of the
    Lord,”
    —Bible: Hebrew Judges (l. V, 10–11)