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: Soundproofing
Famous quotes containing the word noise:
“Soon, with a noise like tambourines,
Came her attendant Byzantines.”
—Wallace Stevens (1879–1955)