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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
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.
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
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 Sound Reinforcement Input Processing
Parametric
Equalization
Acoustic Echo
Cancellation
Noise
Cancellation
Automatic
Gain Control
Fader
Automixer
Delay
Feedback
Cancellation
Dynamics
Processor
Mute
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.