Audio Parameters 3-85
September 2008
Chapter 3 - MTM800 Product Information Manual 6866537D87-F
• 3 – the gain is higher than the default gain of the microphone.
• 6 – the highest gain value possible.
To select the required level, put the pointer into the field value, click on the arrow, and drag the
pointer to the desired level.
22.2 AGC (Automatic Gain Control)
Automatic Gain Control (AGC) can be implemented in the following audio paths during private
simplex calls. This feature, when enabled, will maintain a constant audio output level and has the
following options:
• No receiving and no attenuator.
• External Microphone 12 dB attenuator - When this feature is enabled (only during private
simplex calls), an Automatic Gain Control (AGC) is implemented in the microphone path in
order to keep the active speech level at a certain reference power level.
• Digital receiving AGC - When this feature is enabled (only during private simplex calls), an
Automatic Gain Control (AGC) is implemented in the receiver path in order to keep the active
speech level at a certain reference power level.
• Receiving and attenuator.
22.3 Ambience Listening
This provides an authorised user (a dispatcher etc.) with the ability to cause a terminal to transmit,
without giving any indication to the user, allowing any audio activity picked up by the terminal’s
microphone to be transmitted and monitored.
22.3.1 SS-AL IGM Gain
(Supplementary Services-Ambience Listening Internal Microphone Group).
This entry sets the gain of the terminal’s internal microphone between -3 and 24 in steps of 3. The
default is 9.
22.3.2 SS-AL EMG Gain
(Supplementary Services-Ambience Listening External Microphone Group)
This entry sets the gain of a microphone connected to the terminals accessory connector between -
3 and 24 in steps of 3. The default is 9.
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