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© 2003 Shure Incorporated DFR22 Software Guide 52
Compressor/Limiter
Threshold Exceeded Indicator
Threshold
This indicates the gain level the signal must reach before the processor begins compressing it.
You can change the value by clicking on the spin buttons, typing in a specific value, or using
the threshold slider above the transfer curve graph. The available range of values is from -60dB
to +20dB in 0.5dB increments, with a default value of 0dB.
Ratio
This indicates the amount of gain reduction you are achieving at the output of the processor, rel-
ative to the input level. A setting of 4:1, for example, means that a 4dB increase in the level of
the program material results in a 1dB increase in the output level from the processor. You can
change the value by clicking on the spin buttons, typing in a specific value, or using the ratio slider on the right-
hand side of the transfer curve graph. The range of available values is from 1:1 to INF:1, in increments of a
tenth, with a default value of 2:1 for the compressors and 10:1 for the limiters. The Peak Stop Limiter has a
fixed ratio of INF:1.
Attack
This indicates how much time the processor waits before starting to reduce the gain, once the
input signal level passes the threshold. The range of available values is from 1ms to 200ms,
with a default value of 5ms for the compressors and 2ms for the limiters. The Peak Stop Limiter
has a fixed attack time of 0 ms.
Decay
This indicates how much time the processor waits before returning to unity gain, once the input
signal level drops below the threshold. The range of available values is from 50ms to 1000ms,
with a default value of 100ms for the compressors, 50ms for the limiters, and 20ms for the Peak
Stop Limiter.
Knee
In soft knee processors, this control displays a pull-down list from which you can select either soft knee or hard
knee compression. The default setting is “
SOFT.” In the standard compressors and limiters, this control is disabled.
Default
Click this button to reset the processor to its system default settings.
Signal level has exceeded the threshold
This indicator appears lighted in yellow when the
input signal to the processor block exceeds the
specified threshold
Signal level has not reached the threshold
Soft Knee
Processor
Select “SOFT” or “HARD” from the pull-down list.
Standard
Processor
The control is disabled.