Troubleshooting; Automatic Microphone Mixer - Polycom Vortex EF2280 Reference Manual

T
ROUBLESHOOTING
A M
UTOMATIC ICROPHONE
No microphones
are gating
Some
microphones are
not gating
Too many
microphones are
gating
© Polycom, Inc.
M
IXER
• Check if the microphones are muted.
• Are microphones part of one of the 2 automixers?
• Check if the microphones are assigned to an automixer.
• Check if the microphones are muted.
• Check microphone levels. Are microphones set to the appropriate mic or
line level? Is phantom power on where needed?
• The Hold Time may be too low. Microphone channels gating On and Off
too frequently during short pauses in speech might be the result of set-
ting the Hold Time too low.
• Check Gating settings. Are microphones Forced Off?
• Is Chairman Mode on? If you have assigned a Chairman Mic, all other
microphones will gate Off once this microphone gates on.
• Check Gating Priority. If your inputs have a Gating Priority of 4, the micro-
phones may not gate as frequently.
• Check Maximum Number of Open Microphones. This parameter sets the
number of open microphones allowed at any time. If this parameter is set
too low, the microphones may not gate as often as you wish.
• Adjust the Adaptive Threshold if the Gate Threshold is set to Adaptive or
adjust the Manual Threshold if the Gate Threshold is set to Manual. For
Adaptive Gate Threshold, set the Adaptive Threshold lower so that the
microphone will gate On when lower level signals are present at the
microphone. For Manual Gate Threshold, set the Manual Threshold to a
lower absolute threshold.
• Lower the local NOM setting to reduce the number of mics that can gate
on.
• The Hold Time might be too high. Too many microphones gating on at
the same time may be the result of Hold Time values that are too high.
• Assign a Chairman Mic. This will cause all other microphones to gate Off
once this microphone gates on and will prevent too many microphones
from gating.
• Set Gating Priority so that not all microphones have the same priority. The
default value for each input is a Gating Priority of 1, which is the highest
priority.
• Adjust the Adaptive Threshold if the Gate Threshold is set to Adaptive or
adjust the Manual Threshold if the Gate Threshold is set to Manual. For
Adaptive Gate Threshold, set the Adaptive Threshold higher so that the
microphone will gate when only louder signals are present at the micro-
phone. For Manual Gate Threshold, set the Manual Threshold to a higher
absolute threshold.
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ROUBLESHOOTING
V EF2280 Reference Manual
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