#3 Noise Cancelling Headphones

Fogel was considered to be the inventor of active noise cancellation and he designed one of the first noise canceling headphones systems. Later on, Willard Meeker, designed an active noise control model that was applied to circumaural earmuffs for advanced hearing protection. Noise-cancelling aviation headsets are now commonly available. A number of airlines provide noise-cancelling headphones in their business and first class cabins. Noise cancelling is particularly effective against aircraft engine noise. In these cases, the headphones are about the same size as normal headphones. The electronics, located in the plane handrest, take the sound from the microphone behind the headphone, invert it, and add it back into the audio signal, which reduces background noise.