Polycom SoundStructure C16 Design Manual page 120

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
• Gate
The SoundStructure Studio user interface for adjusting the dynamics settings
are shown in the following figure.
The dynamics processing can be turned on or off for a channel by toggling the
enable button on either the channels page or on the dynamics control high-
lighted on the previous figure. As with other controls, dynamics processing
can be configured for a virtual channel or a virtual channel group. When
dynamics processing is applied to stereo virtual channels, the underlying left
and right dynamics processors will apply the same gain. Linked dynamics
processors apply gain as though the highest level input signal were applied to
both of their inputs.
The gate, expander, compressor, limiter, and peak limiter must be enabled
individually with their individual enable buttons. In the previous figure the
limiter is enabled. Once the dynamics processing is enabled, the dynamics pro-
cessing curve will update as adjustments are made to the dynamics processing
settings.
On the dynamics processing page there is also a fader control - the same fader
control found on the channels and matrix page- that can be used to add or
remove gain from the underlying virtual channel.
The Reset button may be used to return the Dynamics processing to its default
settings which leaves the signal unprocessed.
Compressors And Limiters
The peak limiter monitors the peak signal magnitude and compares it to a
threshold. If the peak surpasses the threshold, the peak limiter immediately
attenuates the signal with a very fast attack to bring the peak level below the
threshold.
Limiters and compressors attenuate high-level signals without changing low
level signals and are typically used to prevent loud signals from clipping, or to
reduce the dynamic range of a signal to make the output level more consistent
even if the input level is not consistent. When the input signal level rises above
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