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Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...
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 ...
Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...
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While two audience members are blindfolded and wear noise-canceling headphones on stage, Jimmy selects another audience member to come down and photocopy their face; after doing so, that person returns to their seat. Singularly each of two contestants are given the photocopy and the task to run into the audience to find the photocopied person.
The performance of noise cancelling headphones is heavily dependent on the efficiency of the noise cancelling filter circuit that sits between the noise detection microphone (usually positioned on the outside of the ear cup) and the speaker driver which generates the required ‘anti-noise’ wave.
Sound masking is the inclusion of generated sound (commonly, though inaccurately, referred to as "white noise" or "pink noise") into an environment to mask unwanted sound. It relies on auditory masking. Sound masking is not a form of active noise control (noise cancellation technique); however, it can reduce or eliminate the perception of sound.
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