Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
5 - 44
Camera activity is similar to channel activity, but has some additional time
that the microphone must be gated before the camera gating indicator is made
active. The camera gating status is intended to be used with logic outputs or
control systems that interface to a camera positioning system that can have
various presets according to which microphones are active.
Adaptive Threshold
Adaptive threshold is the level in dB relative to its noise floor a signal must
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
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