Processing Delay; Controlling Fader; Using The Matrix Page - Polycom SoundStructure C16 Design Manual

Processing Delay

The delay processing allows the designer to add up to 1000 milliseconds of delay on the submix signal.
While the delay is set in milliseconds in the user interface, it can be manually set through the command API
in samples where each sample represents 1/48 of a millisecond.

Controlling Fader

The fader control enables the user to add gain or attenuate the submix signal from +20 dB to -100 dB with
a resolution of 0.1 dB. This gain is applied in the digital domain.
A maximum and minimum gain range can be specified for the submix faders to limit the user gain control.
The process of setting the min and max volume controls is described in the
Input Signals section.
The signal level meter next to the submix fader shows the signal activity after all the submix processing is
applied. If a submix is muted, the signal level meter for the fader shows no signal activity.

Using the Matrix Page

The matrix page is where input virtual channels are routed to output channels through the matrix crosspoints
and crosspoint gains.
A typical matrix page is shown in the following figure with the input signals on the left and the output signals
across the top. All the unmuted crosspoints are shown as bold and the value of each crosspoint is shown
in dB. A bold 0 means that the input signal is routed to the output signal and its amplitude is unchanged.
Outputs are created from inputs by summing the values in the column associated with each output signal.
Since input and output channels may be either monaural or stereo virtual channels, there are two special
cases to consider when setting crosspoint values:
1 When a stereo input channel is mapped to a mono output channel with a gain of 0 dB, the left and
right physical channels are automatically attenuated by 3 dB to create the mono output. The 3 dB
attenuation value is used because it is assumed the left and right signals are uncorrelated.
2 When a mono input signal is mapped to a stereo output signal with a gain of 0 dB, the mono input is
mapped to both the left and the right physical output channels with an attenuation of 3 dB.
Polycom, Inc.
Controlling Fader in the Setting
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