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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
5 - 20
Since there is only one large input range on SoundStructure devices, it is easier
to see how much gain is required for each microphone input.
Gain settings are adjusted by moving the slider or typing the input value into
the user control. Values can also be adjusted by clicking on the slider and using
the up and down arrows to increase or decrease the value by 1 dB and by using
the page up and page down keys to increase or decrease the value by 10 dB.
By supporting -20 dB as part of the analog gain range, effectively there is a 20
dB adjustable pad that makes it possible to reduce the gain of input sources
that have a nominal output level that is greater than the 0 dBu nominal level
of the SoundStructure devices.
Mute
The mute status of an input virtual channel, or virtual channel group, may be
changed by clicking the Mute button. When muted, the channel will be muted
after the input processing and before the input is used in the matrix as shown
in the following figure. The location of the input signal mute in the signal pro-
cessing path ensures that the acoustic echo canceller, automatic gain control,
feedback reduction, and noise canceller continue to adapt even while the input
is muted.
Phantom Power
48 V phantom power may be enabled or disabled on a per input basis by click-
ing the phantom power button. The SoundStructure device supports up to 7.5
mA of current at 48 V on every input. By default, phantom power is turned off
for all inputs if there is no SoundStructure Studio configuration loaded into the
device.
To enable or disable the phantom power, expand the level control by clicking
on the expand graphic in the upper right corner and click the phantom power
Mic or Line
Input
Input to
Matrix
Input to
Matrix
Parametric
Equalization
A/D
Converter
Analog
Gain
Acoustic Echo
Cancellation
Noise
Cancellation
Automatic
Gain Control
Automixer
AGC Dynamics Fader Delay
Fader
Automixer
Automixer
Delay
Automatic
Gain Control
Non Linear
Processing
Feedback
Cancellation
Dynamics
Processor
Dynamics
Processor
Fader
Input to
Matrix
Automatic
Gain Control
Fader Delay
Dynamics
Processor
Delay
Mute
Router
Recording/
Ungated
Conferencing
Sound
Reinforcement
C-Series Input Processing
Input to
Matrix
Input to
Matrix
Delay
Delay
Input to
Matrix
Delay
Delay
Mute