Active noise control
Method for reducing unwanted sound / From Wikipedia, the free encyclopedia
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"Sound suppression" redirects here. For a muzzle device for a gun, see Silencer (firearms). For deflecting noise in rocket launches, see Sound suppression system.
Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in commercial airline headsets with the technology becoming available in the late 1980s. The technology is also used in road vehicles, mobile telephones, earbuds, and headphones.