Polycom SoundStructure C16 Design Manual page 39

SR-Series Input Processing
Router
Mic or Line Analog A/D Parametric Noise
Input Gain Converter Equalization Cancellation
Feedback
Cancellation
The automixer processing is only applied to the noise cancelled and sound
reinforcement signal paths to ensure that there is an 'un'-automixed version of
the input signal available for recording/ungated applications
AGC Dynamics Fader Delay Mute
Automatic Dynamics
Fader Delay
Gain Control Processor
Automixer
Automatic Dynamics
Automixer Fader Delay
Gain Control Processor
Automatic Dynamics
Automixer Fader Delay
Gain Control Processor
AGC Dynamics
Automatic Dynamics
Gain Control Processor
Router
Automatic Dynamics
Gain Control Processor
k Automatic Dynamics
on Gain Control Processor
Each analog input signal is processed to create three processed versions that can
be 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 pro-
cessed version of an input signal, another output signal can use the noise
cancelled 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 the Matrix Crosspoint section following this section.
Noise Cancelled Version
The conferencing version is processed with input equalization, noise cancella-
tion, automatic gain control, dynamics processing, automixer, fader, delay,
and input mute. The noise cancelled 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
Input to Recording/
Matrix
Ungated
Input to
Noise Cancelled
Matrix
Sound
Input to
Matrix Reinforcement
Fader
Fader
Automixer
Automixer Fader
Automixer Fader
SoundStructure Product Family
Delay Mute
Input to
Recording/
Delay
Matrix
Ungated
Input to
Noise Cancelled
Delay
Matrix
Sound
Input to
Delay
Matrix Reinforcement
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