Polycom C16 - Manual (Page 105)

Customizing SoundStructure Designs
5 - 25
following figure.
The low delay type corresponds to a processing path that completely bypasses
the processing of the AEC and noise cancellation. Because these processing
blocks are not in the signal path, the signal has lower latency. The AEC and
noise cancellation add 16 msec of latency to the signal path. The resulting pro-
cessing path from bypassing the AEC and noise cancellation paths is shown in
the following figure.
These two delay options are summarized in the following table.
The signal processing associated with the low delay option is shown in the fol-
lowing figure for both the ungated sound reinforcement path and automixed
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
UNGATED - Sound Reinforcement Processing
Parametric
Equalization
Acoustic Echo
Cancellation
Noise
Cancellation
Automatic
Gain Control
Fader Delay
Feedback
Cancellation
Dynamics
Processor
Mute
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
UNGATED - Low Delay Sound Reinforcement Processing
Parametric
Equalization
Automatic
Gain Control
Fader Delay
Feedback
Cancellation
Dynamics
Processor
Mute
Router
When the low delay option is selected, the sound reinforcement and sound
reinforcement ungated processing paths will NOT have any echo and noise
cancellation processing. Only the conferencing and ungated conferencing versions
of the input processing will have echo and noise cancellation processing.
Delay Type Meaning
Normal The signal path includes the latency
associated with the echo and noise
cancellation signal path
Low delay The signal path does NOT include the
latency associated with the echo and
noise cancellation signal path. The echo
and noise cancellation blocks are
completely bypassed.