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Acousti Products - Active Noise Control 'Anti-Noise' in Silencing ...
Image shows how the concept of 'Anti-Noise' works, where 2 sound ...
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anti-noise
sound which is produced in such a way that it matches exactly and removes the effect of loud and possibly harmful noises, such as those produced by large engines in factories
dictionary.cambridge.org/define.asp?key=3197&dict=CALD
Active noise control (ANC) (also known as noise cancellation, active noise reduction (ANR) or antinoise) is a method for reducing unwanted sound.
en.wikipedia.org/wiki/Anti-noise