Changing The Mute Status; Enabling Phantom Power - Polycom SoundStructure C16 Design Manual

microphone inputs have a mic/line switch that adds 33 dB of gain to a Vortex input signal. As a result, 48 dB
of gain on a SoundStructure input is equivalent to a gain of 15 dB on a Vortex mic/line input that is in mic
mode because of the additional 33 dB of gain on the Vortex when in mic mode.
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.

Changing the Mute Status

You can change the mute status of an input virtual channel, or virtual channel group, by clicking Mute. When
muted, the channel is 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 processing path ensures that the
acoustic echo canceller, automatic gain control, feedback reduction, and noise canceller continue to adapt
even while the input is muted.
Muted Channels Before and After Input Processing
C-Series Input Processing
Mic or Line A/D Parametric Acoustic Echo
Analog
Converter
Input Gain Equalization Cancellation

Enabling Phantom Power

Enabled or disabled 48 V phantom power on a per input basis by clicking 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.
Polycom, Inc.
AGC
Automatic
Gain Control
Router
Non Linear
Noise Automatic
Processing
Cancellation Gain Control
Feedback Automatic
Cancellation Gain Control
Delay
Delay
Delay
Delay
Dynamics Fader Delay
Dynamics
Fader Delay
Processor
Automixer
Dynamics
Automixer Fader Delay
Processor
Dynamics
Automixer Fader Delay
Processor
Mute
Input to
Matrix
Input to
Matrix
Input to
Matrix
Mute
Input to Recording/
Matrix
Ungated
Input to
Conferencing
Matrix
Sound
Input to
Matrix Reinforcement
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