Polycom SoundStructure C16 Design Manual page 24

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
C-Series Sound Reinforcement Input Processing
Mic or Line Analog A/D Parametric
Input Gain Converter Equalization
Parametric
Equalization
2 - 10
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.
Non Linear
Acoustic Echo Noise
Processing
Cancellation Cancellation
Feedback
Cancellation
Acoustic Echo Noise Feedback
Cancellation Cancellation Cancellation
The automatic gain control on the sound reinforcement processing path will not add
gain to the signal, it will only reduce the gain of the signal.
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 different
versions of the recording/ungated signal that can be selected through the
four-input router shown in the above processing figures. This 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 Chapter
5.
The four ungated versions are described in more detail below:
1. bypass version
2. line input version
3. conferencing version
4. sound reinforcement version
Recording/Ungated - Bypass
The recording/ungated-bypass version 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 following
figure. This version can be used when it is important to minimal audio
AGC Dynamics
Automatic Dynamics
Gain Control Processor
Router
Automixer
Automatic Dynamics
Automixer
Gain Control Processor
Automatic Dynamics
Automixer
Gain Control Processor
Automatic Dynamics
Gain Control Processor
Fader Delay Mute
Fader Delay
Fader Delay
Fader Delay
Automixer Fader Delay
Input to Recording/
Matrix
Ungated
Input to
Conferencing
Matrix
Sound
Input to
Matrix Reinforcement
Mute