Alesis Air Compressor Alesis Air Compressor User Manual

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Noise Gating
To understand a gate's principle of operation, consider a "manual
noise gate." Suppose you're listening to an audio signal being processed
by a relatively noisy effect. As long as the audio signal is present, its
level will generally be higher than the noise, thus masking it.
However, when the audio signal goes away, the noise is no longer
masked and can be heard.
If you connected a volume control after the noisy effect, you could
eliminate the noise by turning down the volume whenever there was
no audio signal. Then, as soon as the audio signal (which masks noise)
returned, you could turn the volume up again.
A noise gate performs a similar function, but automatically. You set a
particular noise gate threshold, and the gate compares the input signal
level to that threshold. If the input signal exceeds the threshold, the
gate acts like a volume control that's all the way up, and lets the signal
through. If the input signal is lower than the threshold, the gate acts
like a volume control that's all the way down, and blocks the input
from reaching the output. If the threshold is set just above the residual
noise level, then the gate will be closed whenever there is hiss, thus
giving a quieter signal.
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