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

CHAPTER 15 Media
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To configure AMD for all calls:
1. Open the DSP Settings page (Setup menu > Signaling & Media tab > Media folder > DSP
Settings):
2. From the 'IPMedia Detectors' drop-down list (EnableDSPIPMDetectors), select Enable .
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

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 side, 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 'AGC Disable Fast Adaptation'
parameter. After Fast Mode is used, the signal should be off for two minutes in order to have the
feature turned on again.
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To configure AGC:
1. Open the DSP Settings page (Setup menu > Signaling & Media tab > Media folder > DSP
Settings).
2. From the 'IPMedia Detectors' drop-down list [EnableDSPIPMDetectors], select Enable.
IP Media Parameters.
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Mediant 4000 SBC | User's Manual