Polycom SoundStructure C16 Design Manual page 93

Installing SoundStructure Devices
level_pre for all input signals is shown in the following figure.
Analog Gain Signal Before (level_pre) Digital Processing
C-Series Input Processing
Mic or Line A/D Parametric
Analog
Converter
Input Gain Equalization
level_pre
The level_pre signal meter is adjacent to the analog input gain slider in SoundStructure Studio, as shown
in the following figure. Adjustments to the gain slider are reflected in the meter - add more gain and the meter
displays more signal activity; lower the gain, and the meter displays less signal activity.
The level_pre Signal Meter in SoundStructure Studio
Because the level_pre meter position is before any processing is applied to the signal, even if the signal is
muted within the SoundStructure device, the level_pre input meter displays any signal activity on that
input.
The level_post meter is after any processing, as shown in the following figure. In the example below, if
the input signal is muted the level_post meter does not display any signal activity.
The exact location of the meter in the signal processing path depends on the type of signal that is viewed,
as described next.
Polycom, Inc.
discusses how the analog gain should be set for best performance. The
Router
Non Linear
Acoustic Echo Noise
Processing
Cancellation Cancellation
Feedback
Cancellation
e A/D
Analog
Converter
Gain
level_pre
AGC Dynamics Fader
Automatic Dynamics
Fader
Gain Control Processor
Automixer
Automatic Dynamics
Automixer Fader
Processor
Gain Control
Automatic Dynamics
Automixer Fader
Gain Control Processor
Parametric
Equalization
Delay Mute
Input to Recording/
Delay
Matrix
Ungated
Input to
Conferencing
Delay
Matrix
Sound
Input to
Delay
Matrix Reinforcement
93