Global Settings; Mixer Settings; Channel Settings - Polycom Vortex EF2280 Reference Manual

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Global Settings.

Decay Time. Decay time is the amount of time the microphone audio takes to
ramp down to the Off Attenuation level after Hold Time. Decay Time values
range from 0 to 5000 msec. The default value is 1000 msec.
Hold Time. This is the amount of time the microphone stays On after the energy
in the channel drops below the gating threshold. The default value is 500 msec.
The range is 1 to 5000 msec. Microphone channels gating On and Off too fre-
quently during short pauses in speech might be the result of setting the Hold
Time too low while too many microphones gating on at the same time may be the
result of Hold Time values that are too high.
Camera Gating Threshold. Specifies the hold time for camera gating informa-
tion.

Mixer Settings.

Bus Mixer. 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 use Bus Mixer 5, then the three automixers (one from each EF2280) will work
as a single automixer containing 12 (3 x 4) microphones. Setting Bus Mixer 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
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EF2280 Reference Manual