Extron electronic DMP 64 manual Automatic Gain Control AGC

Automatic Gain Control (AGC)

AGC adjusts the gain level of a signal based upon the input strength to achieve a more consistent volume. Below the set threshold, the signal is not affected. Above the threshold, weaker signals are boosted up to the maximum gain setting to reach a user‑defined target level. As the signal approaches the target level it receives less gain or no gain at all. Once the signal reaches the target level all gain is removed.

Click in each field to change the values.

Threshold — The input level where maximum gain will be applied (after the attack time is exceeded). On the graph at right, follow the red input level from the lower left to -40 dB where the first 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 (see Maximum Gain, below).

The threshold level can be adjusted from -80.0 to

0.0dB in 0.1 dB increments. Default is -40.0 dB.

Maximum Gain — The highest amplification applied to a signal exceeding the threshold and up to the lower limit of the window (see Window, below).

Maximum Gain can be set from 0.0 dB to +60 dB in

0.1dB increments. Default is 12.0 dB.

Target — 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.

The target level can be adjusted from -40 dB to

0.0dB in 0.1 dB increments. Default is –10.0 dB.

Window — Indicated by the two yellow lines, is a specified range above and below the target level. Below the lower line maximum gain is always applied to the signal. When the signal reaches the window, gain control begins scaling in a linear fashion to achieve smoother results as the signal reaches the target level.

The window range can be set in 0.1 dB increments from 0.0 dB to 20.0 dB. Default is 12.0 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 • Software Control 46