Polycom SoundStructure C16 Design Manual page 37

The automixer processing is only applied to the noise canceled and sound reinforcement signal paths to
ensure that there is an un-automixed version of the input signal available for recording/ungated applications.
SoundStructure SR-Series Processed Input Signals
SR-Series Input Processing
Mic or Line Analog A/D Parametric Noise
Input Gain Converter Equalization Cancellation
Feedback
Cancellation
Note: Analog Input Signal Processing
Each analog input signal is processed to create three processed versions that are
used in different ways in the matrix.
These three different versions of the input signal mean that, at the same time, an output signal to the
loudspeakers can use the sound reinforcement processed version of an input signal, another output signal
can use the noise canceled version without feedback processing, and a different output signal can use the
recording version of the input signal. The decision of which of these three processed versions to use is made
at each matrix crosspoint as described in
Processing Noise Canceled
The conferencing version is processed with input equalization, noise cancellation, automatic gain control,
dynamics processing, automixer, fader, delay, and input mute. The noise canceled signal path is highlighted
in the following figure and the block diagram of this processing is also shown. This is the path that is typically
used to send a noise reduced version of the microphone audio to paging zones that are not acoustically
Polycom, Inc.
AGC Dynamics Fader Delay
Automatic Dynamics
Fader Delay
Gain Control Processor
Router
Automixer
Automatic Dynamics
Automixer Fader Delay
Gain Control Processor
Automatic Dynamics
Automixer Fader Delay
Gain Control Processor
AGC
Automatic
Gain Control
Router
Automatic
Gain Control
k Automatic
on Gain Control
Creating SR-Series Matrix
Mute
Input to
Recording/
Matrix
Ungated
Input to
Noise Cancelled
Matrix
Sound
Input to
Matrix Reinforcement
Dynamics Fader
Dynamics
Fader
Processor
Automixer
Dynamics
Automixer Fader
Processor
Dynamics
Automixer Fader
Processor
Delay Mute
Input to
Delay
Matrix
Input to
Delay
Matrix
Input to
Delay
Matrix
Crosspoints.
Recording/
Ungated
Noise Cancelled
Sound
Reinforcement
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