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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
5 - 42
have to be eligible to be considered active. Higher settings will make the chan-
nel less sensitive - harder to turn the microphone on, while lower settings
make it more sensitive - easier to turn the microphone on.
Priority
The microphone priority parameter can be used with gated automixer groups
to provide a priority of which microphones to keep gated on when the NOM
limit has been reached and can also provide a ‘soft chairman’ functionality by
prioritizing which microphones can be gated on. Microphones with priority
1 are the highest priority, microphones with priority 4 are the lowest priority.
If there is a group NOM limit, the priority parameter helps determine which
microphones are allowed to gate on. If the NOM limit has been reached, a new
high priority microphone will turn off a lower priority microphone to make
room for itself (if a lower priority microphone is currently on). If all of the
open microphones have the same priority, they operate on a first come, first
served basis. In addition to the NOM limit sequencing, some attenuation may
be applied to lower priority microphones when a higher priority microphone
becomes active.
Chairman Mic
The chairman mic feature allows the activation of microphones of important
talkers to suppress activation of other microphones. Each microphone may be
individually configured as chairman or non-chairman. Multiple microphones
in the same group may be configured as chairman mics. If a chairman mic is
activated, all non-chairman mics in its automixer group will be off-attenuated.
Other chairman mics, however, would still be allowed to activate.
Last Mic Mode
When using the gated automixer, last mic on mode can be selected individu-
ally for each virtual channel. Depending on which channels have last mic on
enabled, the behavior may differ. Last mic on mode is ignored when using the
gain sharing mixer.
• If no microphones have last mic mode enabled, all of the channels will gate
off when no channels are active
• If all of the microphones have last mic mode enabled, the last mic to have
activity will always be gated on.
• If only one microphone has last mic mode enabled, this microphone will
turn on when no other microphones are active. An example of this could
be with an instructor’s microphone.
• If some microphones have last mic mode on and some do not, then the
behavior will vary depending on whether the last active microphone has
last mic mode on. If so, that microphone will be enabled, if not, then the
first microphone in the group with last mic mode on will be enabled.