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Chapter 4 - Operations Performed During On Going Conferences
4-20
Enabling/Disabling Auto Gain Control (AGC)
Endpoints and phones vary in the types of source noise and volume they
produce. The Auto Gain Control (AGC) mechanism balances noise and
volume of the received audio signals, for conference participants. AGC is
applied to all incoming audio streams before mixing, and dynamically
changes the amplification of the input signal to provide a constant output
amplitude.
The intensity of input signals can vary due to the following factors:
• Microphone properties and adjustments
• Background noise
• Speaker’s distance from microphone
• Speaker’s manner of speech
In some cases, you may need to disable AGC for a participant during a
conference.
You can enable or disable AGC using the participant's right-click menu or in
the Participant Properties dialog box. For more details about participant
properties modifications, see Chapter 2, “Defining Participant Properties” on
page 2-49.
• The AGC option is applicable to all participants using Audio+ resources.
• The AGC option is enabled in the “system.cfg” in the AUDIO PLUS FLAGS
section. By default, the AGC flag is set to YES, and when defining new
participants, the AGC option is selected.