GAI-Tronics ICP9000, Installation And Service Manual

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ICP9000 Navigator Installation and Service Manual Console Diagnostics
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Microphone Selection and Sensitivity
There are two microphone ports available on the Navigator when microphones are locally connected to
the Navigator MCU. These are the desk/hand/headset port and the gooseneck port. By default, the
Navigator is shipped with the desk/hand/headset port selected. If a gooseneck microphone is to be used,
it must be selected from this menu and the proper sensitivity set.
When the operator elects to change the microphone or the microphone sensitivity, the console displays the
current microphone setting and sensitivity as shown below.
MIC SELECTION/SENSITIVITY
1) DESK/HAND/HEADSET
2) GOOSENECK <= SENSE: 3
<1–2> TO SELECT <MODE> TO EXIT
Figure 25. Mic Selection and Sensitivity Menu
The sensitivity of the microphone actually controls the microphone compressor and does not adjust the
output level of the microphone. The microphone audio is limited to a certain level to prevent distortion
and clipping of voice audio. Increasing the sensitivity of a microphone simply adds pre-gain to the
microphone so that less pronounced voices will have pre-amplification applied. A louder voice would
require less amplification for best audio performance so a lesser sensitivity would be used.
Automatic microphone selection can be used when a headset or handset is used from time to time and the
operator wishes to revert to another microphone when neither of these is in use. For example, to use the
gooseneck microphone when the handset is on-hook, select the Desk/Hand/Headset until an
A appears
after the selection and select the gooseneck microphone as shown in the information window above.
When the headset is connected or the handset is taken off-hook, it now becomes the active microphone
and the gooseneck microphone is disabled. When the headset is disconnected or the handset is placed
back on-hook, that microphone is disabled and the gooseneck microphone is again active. To disable this
feature, repeat the procedure above until an
M is displayed after the selection. The setting of this feature
is maintained until changed by the operator.