41
MPX Inputs Menu
Omnia.9sg offers two rear panel composite (MPX) inputs which can be used to feed
the output of an external RDS generator, the composite output of another processor,
or the composite output of a tuner or frequency-agile modulation monitor. The
controls for both MPX Input 1 and MPX Input 2 are identical.
MPX Input 1/MPX Input 2 Menus
Controls to adjust the input gain, source pre-emphasis, delay, equalization, and tilt
are offered.
•
“Input Gain” sets the input level of the MPX input.
•
The setting of the “Source Pre-emphasis” control determines the amount of de-
emphasis (if any) applied when the MPX input signal is selected as a source in a
display window or auditioned in one of the monitor output patchpoints.
Typically, it should match the pre-emphasis of the incoming composite signal.
•
The “Add Delay” control allows the audio being fed to the MPX input to be
delayed to match the latency of Omnia.9sg.
•
Enabling the “PEQ” button turns on the 2-band parametric equalizer. The center
frequency, width, and gain controls work in the traditional manner, while the
“Phase” control offers a choice of phase linear, phase forward, or phase reverse
equalization.
•
The output of most mod monitors and tuners have some tilt present, for which
the “Tilt Amount” and “Tilt Coefficient” controls can compensate.
•
After correcting for tilt, it is still possible to have some DC offset remaining due
to differences in infrasonic frequency between the tilt control and the material
that caused the tilt in the first place. The “DC Servo” control can be used to
compensate for this, but because it moves the entire waveform it technically
invalidates the initial measurement and “fixes” the problem even if it originated
in the transmitter. Accordingly, it should be used with caution. Choosing “Peak-
based” provides the most accurate compensation but should be used only if the
incoming signal is pristine as any noise may be misinterpreted as an actual audio
peak. “Average-based” sacrifices some accuracy but is more tolerant of noisier
signals.
