Active noise control
METHOD FOR REDUCING UNWANTED SOUND BY THE ADDITION OF A SECOND SOUND SPECIFICALLY DESIGNED TO CANCEL THE FIRST
Antinoise; Anti-noise; Sound canceling; Sound suppression; Active noise cancellation; Active noise reduction; Noise cancelling; Noise suppression; Sound cancellation; Noise canceling; Noise-cancelling; Active noise cancelling; Active noise canceling; Sound cancelling; Active Noise Cancellation; Noise cancelling technology; Road-noise Active Noise Control; Noise cancellation; Noise-cancellation
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.