Crestron electronic QM-FTCC - Manual (Page 34)

QuickMedia™ FlipTop Computer Center Crestron QM-FTCC
1. To adjust the input gain, set the gain and noise gate to their lowest settings.
Disable the “Mute” function by removing the check from the Mute
checkbox.
2. Connect a microphone and enable phantom power if required.
3. Increase the gain while providing a “normal” sound level input to the
microphone. When the “Norm” indicator shows fairly consistent activity,
you have reached a good signal level for the QM-FTCC.
NOTE: The "clip" indicator shows that the signal is clipping. Let your ears
be the judge but when the clip indicator is active, you are approaching or
have reached distortion in your QM-FTCC signal. Occasional clip
indications on loud input are expected but constant clip indicator activity is
a sign that the gain may be set too high.
4. Set the system output volume to a desirable listening level and verify the
gain settings by listening to the system output. Some minor gain adjustment
may be required for the “best sound” in any specific configuration.
Setting the Gating Level
The QM-FTCC provides an input level gating function that will mute a microphone
signal when the input sound level is below a user-set threshold. This function can be
enabled or disabled via software commands.
Use the Realtime Mode in SystemBuilder to control phantom power, gain and gate
settings and to monitor the gate, normal and clip level indicators. For information on
using SystemBuilder software, refer to the extensive help information provided with
the software.
The following procedure sets the optimal “gate level” for the microphone inputs:
1. Follow the “Setting Microphone Gain” procedure (refer to page 29) to set
the gain for each microphone input.
2. Set the noise gate level, attack and decay times to minimum. Disable the
“Mute” function by removing the check from the Mute checkbox.
3. While providing a level to the microphone that is equivalent to the
background noise that should be gated out, increase the noise gate level
until the Gated indicator turns off. When the input sound levels are at or
below the established noise gate level, the microphone output signal will be
gated off.
4. Set the “attack time” to the minimum level and the “decay time” to the
maximum level. These settings provide the shortest time to enable the
microphone output when an input is above the gating level and the longest
time before disabling the microphone after such an input.
NOTE: The “attack” and “decay times” are applied to both microphone
inputs.
5. Set the system output volume to a desirable listening level. While providing
realistic voice input and background noise levels, adjust the gating level and
attack/decay times to eliminate undesired input while providing the best
content quality.
30 • QuickMedia™ FlipTop Computer Center: QM-FTCC Operations & Installation Guide – DOC. 6313B