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Crestron QM-MD5x1 QuickMedia™ Matrix Switcher/Mixer
QM-MD5x1, Slot 3 Analog Input Signal Descriptions (continued)
INPUT DESCRIPTION
RightToAudioOutR Sets the mixing level for the Right program
channel of the selected audio source (audio
source selection is accomplished via the Input
Switching module on slot 01).
The Right program channel is mixed with the Left
program channel and “Mic Mix”, and routed to the
PRG R channel of AUDIO OUT.
Valid analog values range from -800d (-80 dB) to
0d (0 dB), adjustable in increments of 0.1 dB.
Changing the analog value by 1d signifies a
boost or attenuation of 0.1 decibels.
A value of -800d (-80 dB) signifies the minimum
mixing level and will cut the mixing level to a
complete mute. A mixing level of 0d (0 dB)
means that the signal will pass unaffected.
NOM_to_MicMix
Sets the NOM (Number of Open Mics) for
automatic mic gain adjustment. This decreases
the overall gain of the mic mixer by 3dB for every
doubling of the number of open microphones
feeding the mixer.
Valid values range from 0d to 2d, corresponding
to the number of currently open mic channels.
There are several ways to use this input:
1. Use an Analog Initialize symbol (speedkey:
INIT) to set the value to the expected maximum
number of open microphones.
2. For systems in which manual muting of
microphones is acceptable, the microphone
feedback signals can be used to calculate the
number of open microphones. Invert the
microphone mute feedback signals and connect
them to the inputs of a Digital Sum symbol
(speedkey: DSUM). Connect the output of the
DSUM to NOM_to_MicMix.
3. For systems requiring automatic handling of
NOM gain adjustment, connect the gating
outputs of the local switcher and remote QM
microphones to the inputs of a Digital Sum
symbol. Connect the output of the DSUM to
NOM_to_MicMix.
QM-MD5x1, Slot 3 Analog Output Signal Descriptions
OUTPUT DESCRIPTION
MicA-1ToMicMix_F Indicates the current mixing level being applied
to remote MIC A-1.
MicA-2ToMicMix_F Indicates the current mixing level being applied
to remote MIC A-2.
MicMixToAudioOutSp_F Indicates the current mixing level being applied
to “Mic Mix” (on the SP channel of AUDIO OUT).
LeftToAudioOutSp_F Indicates the current mixing level being applied
to the Left program channel of the selected audio
source (on the SP channel of AUDIO OUT).
(continued on next page)
Operations Guide - DOC. 6300 QuickMedia™ Matrix Switcher/Mixer: QM-MD5x1 • 43