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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
3 - 2
be used and take extra care to ensure that commands are referencing that exact
input or output signal. If device identification numbers are changed or
different inputs or outputs are used from one design to the next, this requires
changing the control system code programming and spending additional time
debugging and testing the new code to ensure the new device identifications
and channel numbers are used properly. Every change is costly and is error
prone, and can often delay the completion of the installation.
SoundStructure products have taken a different, and simpler, approach to
labeling the inputs and outputs when multiple devices are used together.
SoundStructure products achieve this simplification through the use of
physical channels, virtual channels, and OBAM’s intelligent linking scheme.
As will be shown in the next section, physical channels are the actual input and
outputs numbers for a single device and this numbering is extended
sequentially when multiple devices are used. Virtual channels will extend this
concept by creating a layer over physical channels that allows the physical
channels to be referenced by a user defined label, such as “Podium mic”,
rather than as a channel number.
Physical Channels
SoundStructure defines physical channels as a channel that corresponds to the
actual inputs or outputs of the SoundStructure system. Physical channels
include the SoundStructure analog inputs, analog outputs, submixes, the
telephony interfaces, the conference link channels, and as will be shown later
in this chapter, even the logic input and output pins.
Examples of physical channels are input 3 which corresponds to the physical
analog input 3 on the rear-panel of a SoundStructure device, input 10
(corresponds to analog input 10), and output 6 which corresponds to the
physical analog output 6 on a SoundStructure device as shown in the
following figure.
When designing with SoundStructure products, the analog inputs (such as
microphones, or other audio sources) and outputs from the system (such as
audio sent to amplifiers) will connect to SoundStructure’s physical channels.
Input Physical Channel 3 Input Physical Channel 10
Output Physical Channel 6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
OUTPUTS INPUTS
SoundStructure C16
TM