An Audio Compressor is a device which is used to reduce the dynamic range of a signal. This may be used for technical reasons, such as to prevent a recording exceeding the maximum level and distorting; or for artistic reasons, such as to match the range of a voice to the range of the backing instruments.
A compressor may be basic on operation with few controls, or be provided with a full selection of controls which then allow the operator to set up the operation in detail. The controls which are commonly found on a compressor are:-
| Control
| Usage
|
| Threshold
| The signal level at which the compressor starts to alter the signal level output from the device.
|
| Ratio
| By how much the output signal increase is reduced as the iput signal increases.
|
| Attack
| How fast the compressor responds to an increase in input signal.
|
| Release
| How fast the compressor responds to a reduction in input signal
|
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