Using The Volume Controls - Polycom SoundStructure C16 Design Manual

Note: Muting Audio Not Supported When Muted on Video Codec
In pre-1.3 SoundStructure firmware, If the "Mics" definition is not present on the
SoundStructure device, no audio path is muted when the user mutes the
Codec
. It is the system integrators responsibility to ensure that the
mute signal is mapped effectively to the SoundStructure if the definition of the
"Mics" virtual channel group is changed.
Due to the flexibility of SoundStructure events in SoundStructure firmware version
1.3 or later, a name other than "Mics" may be used and the system operates
properly.

Using the Volume Controls

The volume setting of a Polycom Video Codec system is sent automatically to the SoundStructure device
via the Conference Link2 interface whenever the volume changes on the Polycom Video Codec system. In
pre-1.3 SoundStructure firmware, if the volume changes on the SoundStructure system, the Polycom Video
Codec does not receive the volume change event from the SoundStructure device. Only when volume
change commands are sent to the Polycom Video Codec via a control system or infrared remote the volume
event is automatically transmitted to the SoundStructure device.
In the SoundStructure devices the volume value from the Polycom Video Codec is mapped to the output
fader control on the SoundStructure virtual channel called "Amplifier". The mapping subtracts 30 from the
Video Codec volume setting to create the level to be set on the output fader. The Video Codec volume
settings can range from 0 to 50 which maps to the SoundStructure fader range of -30 to +20.
The fader command executed on the SoundStructure device is:
set fader "Amplifier" x
where x is the Video Codec volume level minus 30.
At the maximum volume setting for the Polycom Video Codec (50), this causes the SoundStructure to
execute the command
set fader "Amplifier" 20
This sets the fader control for the virtual channel "Amplifier" to 20.
A command status message is sent out to the SoundStructure control ports indicating the new fader level.
It is also possible to limit the minimum and maximum user gain settings via SoundStructure Studio software
by using the min and max gain limits on the fader control. This can be done graphically on the channels
Polycom, Inc.
Video
Video Codec
161