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.
Read more about this topic: Soundproof
Famous quotes containing the word noise:
“I will not by the noise of bloody wars and the dethroning of kings advance you to glory: but by the gentle ways of peace and love.”
—Thomas Traherne (1636–1674)