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5.5.5 Audio Leveling (AGC)
On
Select On to allow automatic adjustments (Automatic Gain Control) of audio levels.
When On, the AGC maintains the audio signal level at a fixed value by attenuating
strong signals and amplifying weak signals. Very weak signals, i.e. noise alone, will
not be amplified.
Off
Audio leveling is not activated.
Note that to ensure correct behavior of the AGC, it is crucial that the levels on the input
connectors are adjusted correctly using the audio input level settings. The AGC will not
compensate for severe maladjustment of input levels.
When applying a weak signal in the presence of strong background noise, the AGC might amplify
the background noise as well as the signal. Therefore, in noisy environments, it is advisable to
turn the AGC off.
Example:
In most conferences, the participants will speak at different levels, and be at different
distances from the microphones. As a result, some of the participants would be harder to hear
than others. The AGC corrects this problem by automatically increasing the microphone levels
when “quiet” or “distant” people speak, and by decreasing the microphone levels when
“louder” people speak.