Polycom EF2241 - Manual (Page 22)

I
NTEGRATING THE
EF2241 I
NTO
Y
OUR
S
YSTEM
V ORTEX EF2241 Reference Manual 20 Technical Support: 800.932.2774
Local Max NOM, Global Max NOM, 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 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 Vortex
devices each of which has 2 microphones assigned to Automixer 1 and 2 micro-
phones assigned to Automixer 2. Now, if each of these devices sets their Auto-
mixer 1 to use Bus Mixer 5 for example, then the three automixers (one from
each device) will work as a single automixer containing 6 (3 x 2) microphones.
Setting 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 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 Vortex device that it is set on.
Global Max NOM. Sets the global maximum number of open microphones
Figure 13. Off Attenuation, Hold Time, Adaptive Threshold, and Decay Time.
Ambient Level
A DAPTIVE T HRESHOLD
Channel OFF
Channel ON
Channel turns on when
signal level is above
Adaptive Threshold
Microphone
Audio
Time
Signal Level
H OLD
T IME
O FF A TTENUATION
D ECAY
T IME