Polycom SoundStructure C16 Design Manual page 26

The automatic gain control on the sound reinforcement path is different from the automatic gain control on
the conferencing version of the signal because the sound reinforcement automatic gain control does not
add gain to the signal. In other words, the sound reinforcement AGC only reduces the gain of the input
signal. This restriction on the sound reinforcement AGC is to prevent the automatic gain control on the
sound reinforcement path from increasing the microphone gain and consequently reducing the potential
acoustic gain before the onset of feedback.
SoundStructure C-Series Sound Reinforcement Processing Signal Path
C-Series Sound Reinforcement Input Processing
Mic or Line Analog A/D Parametric
Input Gain Converter Equalization
Parametric
Equalization
Note: No Gain Control Added to Signal
The automatic gain control on the sound reinforcement processing path does not
add gain to the signal, it only reduces the gain of the signal.
Processing Recording/Ungated Version
The recording version of the processed input signal is specifically designed to not include the gain sharing
or gated style of automatic microphone mixing processing. The recording/ungated version of the input
channel is typically used for recording applications or in any application where an un-automixed version of
the input signal is required.
For additional flexibility in audio applications, there are four versions of the recording/ungated signal that
you can select through the four-input router, as shown in the above processing figures. The selection of
which type of recording/ungated signal to choose is performed on an input by input basis within the
SoundStructure Studio software, as described in
The four recording/ ungated versions are listed below:
● Bypass
● Line Input
● Conferencing
● Sound reinforcement
Processing Recording/Ungated–Bypass
The recording/ungated-bypass has no input processing other than a fader gain control, input delay, and
input mute. This version bypasses the automatic gain control and dynamics processing, as shown in the
Polycom, Inc.
Non Linear
Acoustic Echo Noise
Processing
Cancellation Cancellation
Feedback
Cancellation
Acoustic Echo Noise Feedback
Cancellation Cancellation Cancellation
AGC Dynamics
Automatic Dynamics
Gain Control Processor
Automixer
Automatic Dynamics
Automixer
Gain Control Processor
Automatic Dynamics
Automixer
Gain Control Processor
Automatic Dynamics
Automixer
Gain Control Processor
Customizing SoundStructure
Fader Delay Mute
Input to
Fader Delay
Matrix
Input to
Fader Delay
Matrix
Input to
Fader Delay
Matrix
Fader Delay Mute
Designs.
Recording/
Ungated
Conferencing
Sound
Reinforcement
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