Dugan Model M User Guide
Theory of the Speech and Music Systems
15
Gain Limiting
Gain Limiting reduces master gain as new mics become active, thus avoiding feed-
back and noise. This is commonly called
NOM
(number of open mics) gain adjust-
ment. Unlike NOM functions on other systems, Dugan Gain Limiting does not base
its gain limiting calculation on the number of open mics. Instead it sums the gains
of all active channels (including partially attenuated channels), compares them to a
gain threshold, and reduces the gain appropriately.
Figure 2-5
NOM and gain reduction: NOM =1 (left); NOM = 4 (right)
Conventional automatic mixing implementations always assume an NOM of 1. The
Dugan’s unique implementation allows you to set the number of mics that will op-
erate at full gain before gain limiting occurs. For example, if there is enough gain be-
fore feedback to tolerate four open mics, the gain limit can be set to 4. Gain reduction
begins when the fifth mic turns on.
NOTE:
Since the Model M has no master audio channel, Gain Limiting reduces the gain on all
channels in the group for which
NOM
is active.
Gain
Reduction
(dB)
8
6
4
2
0
Number of Open Mikes
(NOM)
4
2
0
6
8
10
Gain
Reduction
(dB)
8
6
4
2
0
Number of Open Mikes
(NOM)
4
2
0
Summary of Contents for Model M
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