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© 2003 Shure Incorporated DFR22 Software Guide 48
Automatic Gain Control (AGC)
Threshold Exceeded Indicator.
Threshold
This indicates the level the signal gain must reach before the processor increases it. Signal lev-
els below the threshold are passed through the processor at unity gain. 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 that exceeds the hinge. 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 10:1,
in increments of a tenth, with a default value of 2:1.
Attack
This indicates how much time the processor waits before responding to rising or falling input lev-
els, once the input level exceeds the threshold, The available values are from 0.2s to 3s, with a
default value of 2 seconds.
Decay
This indicates how much time the processor waits before returning to unity gain, once the input
level increases or decreases closer to the hinge setting. The range of available values is from
0.5s to 5s, with a default value of 5 seconds.
Hinge
The hinge setting is the target output level of the AGC. It is a pivot point that determines
whether the input level is raised or lowered. Signal levels below the hinge (but above the
threshold) will be raised and levels above the hinge will be lowered. You can change the value
by clicking on the spin buttons, typing in a specific value, or using the hinge slider below the
transfer curve graph. The available range of values is from -60dB to +20dB in 0.5dB increments, with a default
value of 0dB.
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