Polycom SoundStructure C16 Design Manual page 106

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
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Most applications benefit from the Line Input ungated signal processing path
for program audio and other non-microphone audio that is not usually
automixed.
An example of using the line input processing is shown in the following figure
where a program audio source can be processed with parametric equalization,
automatic gain control, dynamics processing, fader, delay, and input mute.
Parametric
Equalization
The Sound Reinforcement path is selected by default for microphone audio
because that processing path includes the full echo and noise cancellation, but
does not include the non-linear processing associated with the acoustic echo
canceller to avoid the application of any echo canceller suppression (or duck-
ing) to the signal. The application of using this path is shown in the following
figure where a microphone is connected and echo cancelled and feedback
reduced, but not automixed.
Ungated - Sound Reinforcement Processing
Parametric Acoustic Echo Noise
Equalization Cancellation Cancellation
A complete summary of the signal processing associated with each ungated
processing type is shown in the following figure. For additional information
see Chapter 2.
Ungated - Line Input Processing
Automatic Dynamics
Gain Control Processor
Feedback Dynamics
Automatic
Cancellation Processor
Gain Control
Fader Delay Mute
Fader Delay Mute