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Game Development Dictionary
The noise gate is a piece of studio equipment used to control the volume of an audio signal. The original intended purpose of this is to clean up unwanted noise from a recording, but some nice effects can also be achieved using a noise gate. Used simply, the noise gate only allows an audio signal above a certain threshold to play. This can be used to clean up unwanted noise by setting the threshold above the level of the noise. A typical use of the noise gate as an audio effect is to have it controlled by an additional track - for example, a beat supplied by a drum machine. In this case, the gate can be applied over the top of an audio track such as a synth pad, or perhaps vocal 'oohs'. By 'opening' and 'closing' the gate based on the rhythm supplied by another track (which may or may not be audible itself), the track in question is effectively cut up into a nice rythm. This is often used in electronic music, especially Trance. Software noise gates are also available.