Extron electronics DMP 64 User Manual page 36

AGC (Automatic gain control)
AGC adjusts the gain level of a signal based upon the input strength to achieve a more
consistent volume. Above a set threshold, weaker signals receive more gain to reach a
user-defined target level. Signals stronger than the target receive gain reduction to reduce
the signal towards the target.
Threshold — is the input level where maximum
gain will be applied (after the attack time is
exceeded). From the graph follow the input
level (on the X-axis) at -40 dB up to where
the red circle is. Signal levels less than -40 dB
remain at their original levels. All signal levels
at or exceeding -40 dB will have up to 12 dB of
gain applied (Maximum Gain).
Threshold level can be adjusted from -80.0 to
0.0 dB in 0.1 dB increments.
Default is -40.0 dB.
Maximum Gain — is the highest amplification
applied to a signal exceeding the threshold
and up to the lower limit of the Window (see
below).
Maximum Gain can be set from 0.0 dB to +60
dB in 0.1 dB increments.
Default is 12.0 dB.
Target — is the desired average signal level
of the output when AGC is applied. AGC can
vary the gain according to the input signal level,
specified target level and maximum gain. As
the signal approaches the target level of -10 dB,
gain is reduced until at -10 dB, gain is no longer
applied.
Target level can be adjusted from -40 dB to 0.0 dB in 0.1 dB increments.
Default is -10.0 dB.
Window — is a specified range above and below the target level. When the signal
reaches the lower limit of the window, gain control begins scaling in a linear fashion
toward the target level to achieve smoother results. The window range can be set in
0.1 dB increments from 0.0 dB to 20.0 dB.
Attack Time — adjusts the time delay for AGC to engage after the input signal level
reaches or exceeds the threshold level.
Attack time can be adjusted from 0.0 to 3000.0 ms in 0.1 ms increments.
Default is 500.0 ms.
Hold Time — adjusts how long AGC continues after the input signal drops below the
threshold and before release time begins.
Hold time can be adjusted from 0.0 to 3000.0 ms in 0.1 ms increments.
Default is 0.0 ms.
Release Time — adjusts the time it takes to return the signal to normal (unprocessed)
levels after the signal no longer exceeds the threshold level setting. Release time begins
only after hold time is reached.
Release time can be adjusted from 10.0 to 10000.0 ms in 0.1 ms increments.
Default is 1500.0 ms.
DMP 64 • Operation 30