INTEGRATING THE UNIT INTO YOUR SYSTEM
© Polycom, Inc. 19 VORTEX EF2211/EF2210 Reference Manual
Bias, Off Attenuation, Threshold Type, Gating Mode, Adaptive Threshold, Manual
Threshold, and Gate Priority.
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
frequently 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 infor-
mation.
Mixer Settings.
Bus Mixer. This command is used to assign the automixer to one of the EF Bus
automixer groups. Setting the Bus Mixer to the same number as the automixer
on another Vortex device will allow the devices to be one large automixer. Set-
ting Bus Mixer to 0 means that the automixer is not grouped on the EF Bus and
the automixers operate independently.
Chairman Mode. Enables or disables Chairman Mode for the automixer.
Chairman Mic. Sets the Chairman Microphone for the automixer.
Last Mic On Mode. Sets “Last Mic On” mode for the 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 auto-
mixer to leave the last open microphone on. The last microphone number is
specified for the 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 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 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 automixer. Setting
Figure 11. Off Attenuation, Hold Time, Adaptive Threshold, and Decay Time.
Ambient Level
ADAPTIVE THRESHOLD
Channel OFF
Channel ON
Channel turns on when
signal level is above
Adaptive Threshold
Microphone
Audio
Time
Signal Level
HOLD
T
IME
OFF ATTENUATION
DECAY
T
IME
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