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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
2 - 24
Recording/Ungated - Noise Cancelled
The noise cancelled recording input includes the noise cancellation as shown
in the next figure. This path is typically used for recording of microphone
audio as it includes all the noise cancellation but not the automatic
microphone mixer processing.
Recording/Ungated - Sound Reinforcement
Finally, the sound reinforcement recording input includes the noise
cancellation and optional feedback elimination processing as shown in the
following figure.
SR-Series Matrix Crosspoints
The audio matrix is used to create different mixes of input signals and submix
signals to be sent to output signals and submix signals. Matrix crosspoints gain
values are shown in dB where 0 dB means that the signal level is unchanged.
Matrix crosspoint gains can be adjusted in 0.1 dB steps between -100 and +20
dB and may also be completely muted. In addition, the matrix crosspoint can
also be negated/inverted so that the crosspoint arithmetic creates a
subtraction instead of an addition.
Matrix crosspoints associated with stereo virtual channels have a balance or
pan to control mapping mono to stereo virtual channels, stereo to mono virtual
channels, and stereo to stereo virtual channels.
The different versions of the input processing are selected at the matrix
crosspoint. The user interface provides an option for selecting the different
versions of the input processing including the noise cancelled, sound
reinforcement, and ungated/recording version. As will be shown in Chapter
4 Creating Designs, different versions of the input processing will be
Mic or Line
Input
Input to
Matrix
Input to
Matrix
Parametric
Equalization
A/D
Converter
Analog
Gain
Noise
Cancellation
Automatic
Gain Control
Automixer
AGC Dynamics Fader Delay
Fader
Automixer
Automixer
Delay
Automatic
Gain Control
Feedback
Cancellation
Dynamics
Processor
Dynamics
Processor
Fader
Input to
Matrix
Automatic
Gain Control
Fader Delay
Dynamics
Processor
Delay
Mute
Router
Recording/
Ungated
Noise Cancelled
Sound
Reinforcement
UNGATED - Noise Cancellation Processing
Parametric
Equalization
Noise
Cancellation
Automatic
Gain Control
Fader Delay
Dynamics
Processor
Mute
Mic or Line
Input
Input to
Matrix
Input to
Matrix
Parametric
Equalization
A/D
Converter
Analog
Gain
Noise
Cancellation
Automatic
Gain Control
Automixer
AGC Dynamics Fader Delay
Fader
Automixer
Automixer
Delay
Automatic
Gain Control
Feedback
Cancellation
Dynamics
Processor
Dynamics
Processor
Fader
Input to
Matrix
Automatic
Gain Control
Fader Delay
Dynamics
Processor
Delay
Mute
Router
Recording/
Ungated
Noise Cancelled
Sound
Reinforcement
UNGATED - Sound Reinforcement Processing
Parametric
Equalization
Noise
Cancellation
Automatic
Gain Control
Feedback
Cancellation
Fader Delay
Dynamics
Processor
Mute