Polycom Vortex EF2280 Reference Manual page 27

Autom ixer
Mixer Settings
(AM1/AM2)
Bus ID
Chairm an Mode
Chairm an Mic
Last Mic On Mode
Last Mic Number
Local Max NOM
Global Max NOM
Off Attenuation
Delay Enable
Delay
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 an internal automixer to an EF
Bus automixer group. For example, consider three Vortex devices each of
which has 2 microphones assigned to Automixer 1 and 4 microphones
assigned to Automixer 2. Now, if each of these devices sets their Auto-
mixer 1 to have Bus Mixer 5, then the three automixers (one from each
device) will work as a single automixer containing 12 (3 x 4) micro-
phones. Setting Bus Mixer to 0 means that the automixer is not grouped
on the EF Bus and hence operates independently.
Chairman Mode. Enables or disables Chairman Mode for the specified
automixer.
Chairman Mic. Sets which Microphone will be Chairman 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 Vortex device that it is
set on.
Global Max NOM. Sets the global maximum number of open micro-
phones (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 auto-
mixer. Setting this value to 18 would result in the microphone signals
being attenuated by 18 dB when gated off. This value is set indepen-
dently for each of the automixers.
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 man-
ual automatic gating thresholds per input.
Gating Mode. Sets the automixer gating control mode for specified
input channel. The possible modes are Normal Gating, Microphone Forced
On, or Microphone Forced Off.
Adaptive Threshold. This is also referred to as the 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 adaptive threshold, scroll
through the adaptive threshold range and select the desired adaptive
threshold by pressing E
Manual Threshold. Sets the automixer gating threshold for the speci-
fied input channel. This value is only used if the input set to Manual Gat-
ing via the T
HRESHOLD
from 0 to 100 (shown in Conference Composer as 0 to -100) and repre-
25
.
NTER
T option. The manual threshold value ranges
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EF2280 Reference Manual