Polycom SoundStructure C16 Design Manual page 117

UNGATED - Conferencing Processing
Mic or Line Analog A/D Parametric
Converter
Input Gain Equalization
Parametric
Equalization
Noise cancellation can be enabled for a non microphone channel, such as a
video codec audio or program audio, by selecting the conferencing version of
the ungated signal path (note that the default selection for non-microphone
audio sources is the line-input processing path). The ungated conferencing
signal path is shown in the following figure. Notice that the noise cancellation
processing is now in the signal path along with the automatic gain control,
dynamics processing, fader, delay, and mute. The acoustic echo canceller is
also in this signal path but should not be enabled for non-microphone audio
sources.
Non Linear
Acoustic Echo Noise
Processing
Cancellation Cancellation
Feedback
Cancellation
Acoustic Echo Noise Non Linear
Cancellation Cancellation Processing
AGC Dynamics
Automatic Dynamics
Gain Control Processor
Automixer
Automatic Dynamics
Automixer
Processor
Gain Control
Automatic Dynamics
Automixer
Gain Control Processor
Automatic Dynamics
Gain Control Processor
Customizing SoundStructure Designs
Fader Delay Mute
Input to
Fader Delay
Matrix
Input to
Fader Delay
Matrix
Input to
Fader Delay
Matrix
Fader Delay Mute
Recording/
Ungated
Conferencing
Sound
Reinforcement
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