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Active noise control From Wikipedia, the free encyclopedia Jump to: navigation search Active noise control (ANC) (also known as noise cancellation active noise reduction (ANR) or antinoise ) is a method for reducing unwanted sound Contents Explanation Applications See also External links ... edit Explanation Sound is a pressure wave , which consists of a compression phase and a rarefaction phase. A noise-cancellation speaker emits a sound wave with the same amplitude and the opposite polarity (in antiphase ) to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out - an effect which is called phase cancellation . Depending on the circumstances and the method used, the resulting soundwave may be so faint as to be inaudible to human ears. A noise-cancellation speaker may be co-located with the sound source to be attenuated . In this case it must have the same audio power level as the source of the unwanted sound. Alternatively, the transducer emitting the cancellation signal may be located at the location where sound attenuation is wanted (e.g. the user's ear). This requires a much lower power level for cancellation but is effective only for a single user. Noise cancellation at other locations is more difficult as the three dimensional wavefronts of the unwanted sound and the cancellation signal could match and create alternating zones of constructive and destructive interference. In small enclosed spaces (eg the passenger compartment of a car) such global cancellation can be achieved via multiple speakers and feedback microphones, and measurement of the modal responses of the enclosure.

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