Polycom DOC2066F manual Enabling/Disabling Auto Gain Control AGC

Chapter 4 - Operations Performed During On Going Conferences

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

•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.

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.

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