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QM-FTCC Microphone Control  – Signal Descriptions  
SIGNAL TYPE AND 
NAME 
DESCRIPTION 
Digital inputs:  
<Mic1Mute
<Mic2Mute
Mutes the MIC 1/LINE 1 or MIC 2/LINE 2 audio for 
as long as the input is high. 
High/1 (level sensitive) = Mute audio; Low/0 = Un-
mute audio 
Digital outputs: 
<Mic1Mute-F
<Mic2Mute-F
Indicates that the corresponding MIC/LINE input is 
muted. 
High/1 = Mic audio is muted; Low/0 = Mic audio is 
not muted 
Digital inputs: 
<Mic1GatingEnable
<Mic2GatingEnable
Enables noise gating for MIC 1/LINE 1 or MIC 
2/LINE 2, for as long as the input is high. 
Gating eliminates unwanted background noise that 
could prove distracting when amplified. The noise 
gate will not pass an audio signal unless it is above 
the threshold, set by the <GatingLevel> input. 
High/1 (level sensitive) = Enable gating; Low/0 = 
Disable gating 
Digital outputs: 
<Mic1GatingEnable-F
<Mic2GatingEnable-F
Indicates the current status of the noise gate for the 
corresponding MIC/LINE input. 
High/1 = Gating is enabled; Low/0 = Gating is 
disabled 
Digital outputs:  
<Mic1Gate>, <Mic2Gate
Indicates that the signal level on MIC 1/LINE 1 or 
MIC 2/LINE 2 has exceeded the <GatingLevel>. 
High/1 = Gating level exceeded; Low/0 = Gating 
level not exceeded  
Digital outputs:  
<Mic1Nominal
<Mic2Nominal
Indicates that the signal level on MIC 1/LINE 1 or 
MIC 2/LINE 2 has exceeded the nominal level.  
The nominal indication is reported at 10% of the 
maximum level supported by the hardware, or 20dB 
below the input clip level. 
High/1 = Nominal level exceeded;  
Low/0 = Nominal level not exceeded  
Digital outputs:  
<Mic1Clip
<Mic2Clip
Indicates that the signal level on MIC 1/LINE 1 or 
MIC 2/LINE 2 has exceeded 50% of the maximum 
level supported by the hardware, or 6dB below the 
input clip level. This signifies a mic level that is too 
hot. 
High/1 = Mic signal clipping;  
Low/0 = Mic level not clipping 
Digital input: 
<PhantomEnable
Enables the 48V phantom power supply for as long 
as the input remains high. (Phantom power is 
required by condenser microphones, but should be 
disengaged for dynamic microphones.) 
High/1 (level sensitive) = Enable phantom power;  
Low/0 = Disable phantom power 
Digital output: 
<PhantomEnable-F
Indicates that phantom power has been enabled. 
High/1 = Phantom power is on; Low/0 = Phantom 
power is off 
Analog inputs:  
<Mic1GatingLevel
<Mic2GatingLevel
Sets the threshold for gating. The noise gate is 
enabled for as long as the <GatingEnable> input is 
high. 
Valid gating values range from 0% to 100%. 
Once the microphone audio rises above 
<GatingLevel> the gate opens, allowing the signal 
to pass through. 
If the <MicNominal> feedback pulses while the 
<MicGate> feedback remains low, this indicates a 
threshold that is set too high. 
Continued on the following page 
Operations  & Installation Guide – DOC. 6313A 
FlipTop Computer Center: QM-FTCC 
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