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Noise gate

An electronic process used to reduce noise levels in audio and video. In the video, the most effective noise reduction is accomplished by digitizing the video signal and carrying out a computerized pixel by pixel analysis of the data.
1626px Drawmer Ds201 Dual Noise Gate Ducker Left Half, Angled (2015 02 01 By Mikael Altemark)

A noise gate or gate is an electronic device or software that is used to control the volume of an audio signal. Comparable to a compressor, which attenuates signals above a threshold, such as loud attacks from the start of musical notes, noise gates attenuate signals that register below the threshold. However, noise gates attenuate signals by a fixed amount, known as the range. In its simplest form, a noise gate allows a main signal to pass through only when it is above a set threshold: the gate is 'open'. If the signal falls below the threshold, no signal is allowed to pass (or the signal is substantially attenuated): the gate is 'closed'. A noise gate is used when the level of the 'signal' is above the level of the unwanted 'noise'. The threshold is set above the level of the 'noise' and so when there is no main 'signal', the gate is closed.

A common application is with electric guitar to remove hum and hiss noise caused by distortion effects units. A noise gate does not remove noise from the signal itself. When the gate is open, both the signal and the noise will pass through. Even though the signal and the unwanted noise are both present in open gate status, the noise is not as noticeable. The noise becomes most noticeable during periods where the main signal is not present, such as a bar of rest in a guitar solo. Gates typically feature 'attack', 'release', and 'hold' settings and may feature a 'look-ahead' function.

Key Terms

gate
level
main signal
noise
noise gate
noise gates
signal
signals
threshold
unwanted noise

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Acronymn

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Synonymns

Noise gate
Gate

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Last modified on August 22 2019
Content adapted from Wikipedia
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