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:

    “Sing unto the Lordwith the harp, with the harp, and the voice of a
    psalm.
    With trumpets and sound of cornet make a joyful noise before the Lord,”
    —Bible: Hebrew Psalm XCVIII (l. XCVIII, 5–6)