anti-noise

== English == === Etymology === From anti- +‎ noise. === Noun === anti-noise (uncountable) (audio) Alternative form of antinoise; engineered sound waves, the exact mirror image (same frequency, opposite phase) of unwanted noise, which are played to create destructive interference, effectively canceling out the original sound to produce quietness, primarily used in noise-canceling headphones and systems for constant low-frequency sounds like engine hums. Coordinate terms: active noise control, destructive interference