Automatic Gain Control (Agc) - AudioCodes Mediant 4000 SBC User Manual

3. Scroll down to the Answer Machine Detector group:
4. Select the AMD algorithm suite:
a. In the 'Answer Machine Detector Sensitivity Parameter Suite' field, select the
required Parameter Suite included in the installed AMD Sensitivity file.
b. In the 'Answer Machine Detector Sensitivity' field, enter the required detection
sensitivity level of the selected Parameter Suite.
5. Configure the answering machine beep detection:
a. In the 'Answer Machine Detector Beep Detection Timeout' field
(AMDBeepDetectionTimeout), enter the duration that the beep detector operates
from when detection is initiated.
b. In the 'Answer Machine Detector Beep Detection Sensitivity' field
(AMDBeepDetectionSensitivity), enter the AMD beep detection sensitivity level.
6. Click Apply, and then reset the device with a save-to-flash for your settings to take
effect.
For a complete list of AMD-related parameters, see ''IP Media Parameters'' on page 812.
14.6

Automatic Gain Control (AGC)

Automatic Gain Control (AGC) adjusts the energy of the output signal to a required level
(volume). This feature compensates for near-far gain differences. AGC estimates the
energy of the incoming signal from the IP, determined by the 'AGC Redirection' parameter,
calculates the essential gain, and then performs amplification. Feedback ensures that the
output signal is not clipped. You can configure the required Gain Slope in decibels per
second using the 'AGC Slope' parameter and the required signal energy threshold using
the 'AGC Target Energy' parameter.
When the AGC first detects an incoming signal, it begins operating in Fast Mode, which
allows the AGC to adapt quickly when a conversation starts. This means that the Gain
Slope is 8 dB/sec for the first 1.5 seconds. After this period, the Gain Slope is changed to
the user-defined value. You can disable or enable the AGC's Fast Mode feature, using the
ini file parameter AGCDisableFastAdaptation. After Fast Mode is used, the signal should
be off for two minutes in order to have the feature turned on again.
The following procedure describes how to configure AGC using the Web interface:
User's Manual
Figure 14-12: Configuring AMD
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Mediant 4000 SBC
Document #: LTRT-41729