Polycom Vortex EF2280 Reference Manual page 35

Automixer
Mixer Settings
(AM1/AM2)
Bus ID
Chairman Mode
Chairman Mic
Last Mic On Mode
Last Mic Number
Local Max NOM
Global Max NOM
Off Attenuation
Automixer
Channel Settings
(Inputs 1-8)
Automixer
Threshold Type
Gating Mode
Adaptive Threshold
Manual Threshold
Mic Priority
© Polycom, Inc.
Mixer Settings.
Bus ID. This command is used to assign one of the two internal automixers to
one of the EF Bus automixer groups. For example, consider three EF2280s each
of which has four microphones assigned to Automixer 1 and 4 microphones
assigned to Automixer 2. Now, if each of these EF2280s sets their Automixer 1
to have Bus ID 5, then the three automixers (one from each EF2280) will work as
a single automixer containing 12 (3 x 4) microphones. Setting Bus ID to 0 means
that the automixer is not grouped on the EF Bus.
Chairman Mode. Enables or disables Chairman Mode for the specified auto-
mixer.
Chairman Mic. Sets the Chairman Microphone for the specified automixer.
Last Mic On Mode. Sets "Last Mic On" mode for the specified automixer.
Last Mic Number. Sets the microphone number that will remain on when "Last
Mic On" mode is set to manual. Setting this value to 0 will cause the automixer
to leave the last open microphone on. The last microphone number is specified
for each automixer, but is only used in manual "Last Mic On" mode.
Local Max NOM. Sets the maximum number of open microphones (NOM)
limit for the specified automixer. This NOM limit is a "local" limit, meaning that
this limit applies only to the specific EF2280 that it is set on.
Global Max NOM. Sets the global maximum number of open microphones
(NOM) limit for each linked automixer. The maximum value for this command
is 64. This NOM limit is a "global" limit, meaning that this limit applies to all
linked automixers with the same Bus ID.
Off Attenuation. Sets the Off Attenuation (in dB) for the specified automixer.
Setting this value to 18 would result in the microphone signals being attenuated
by 18 dB when gated off. This value is set independently for each of the auto-
mixers.
Channel Settings.
Automixer (Inputs 1-8). This allows you to select which automatic microphone
mixer (1 or 2) a particular microphone channel is assigned to. A microphone
may only be assigned to automatic mixer 1, automatic mixer 2, or neither (but not
both).
Threshold Type. Sets automatic (also referred to as adaptive) or manual auto-
matic gating thresholds per input.
Gating Mode. Sets the automixer gating control mode for specified input chan-
nel. The possible modes are Normal Gating, Microphone Forced On, or Micro-
phone Forced Off.
Adaptive Threshold. This allows you to determine when to gate a microphone
on based on an estimate of the background noise level. The default value is to
gate a channel on if it is more than 10 dB louder than the background noise level.
Values range from 0 to 100 dB. To set the gate ratio, scroll through the gate ratio
range and select the desired gate ratio by pressing E
Manual Threshold. Sets the automixer gating threshold for the specified input
channel. This value is only used if the input set to Manual Gating via the
T T option.
HRESHOLD YPE
Microphone Priority. The priority of each microphone can be assigned a value
ranging from 1 to 4. Priority 1 microphones have priority over priority 4 micro-
phones for gating. The default is to have all microphones set to priority 1. If
Chairman Mode is enabled, all microphones including ones with priority of 1
will be gated off when the Chairman mic gates on.
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