Volume Control - Polycom SoundStructure C16 Design Manual

Volume Control

In pre-1.3 SoundStructure firmware, If the "Mics" definition is not present on the
SoundStructure device, NO AUDIO PATH WILL BE MUTED when the user mutes
the HDX. It is the system integrators responsibility to ensure that the HDX 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 will operate
properly.
The volume setting of a Polycom HDX system is sent automatically to the
SoundStructure device via the Conference Link2 interface whenever the
volume changes on the Polycom HDX system. In pre-1.3 SoundStructure firm-
ware, if the volume changes on the SoundStructure system, the Polycom HDX
does not receive the volume change event from the SoundStructure device.
Only when volume change commands are sent to the Polycom HDX via a con-
trol system or infrared remote will the volume event be automatically
transmitted to the SoundStructure device.
In the SoundStructure devices the volume value from the Polycom HDX is
mapped to the output fader control on the SoundStructure virtual channel
called "Amplifier". The mapping subtracts 30 from the HDX volume setting to
create the level to be set on the output fader. The HDX 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 HDX volume level minus 30.
At the maximum volume setting for the Polycom HDX (50), this will cause the
SoundStructure to execute the command
set fader "Amplifier" 20
This will set the fader control for the virtual channel "Amplifier" to 20.
A command status message will be sent out to the SoundStructure control
ports indicating the new fader level.
Connecting Over Conference Link2
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