CHAPTER 23
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SYSTEM MENU
♦ The L/R Codec Safety drop-down control can be used to limit high-frequency headroom of the L/R output, a benefit
when using a compressed digital STL and lower bit rates as it may help prevent bit rate reduction-induced peak
overshoots. Settings are Off, Light, Medium and Heavy. You can see the exact effect it has by looking at the oscilloscope
set to L/R Output with oversampling enabled.
♦ The Insert sub menu in the System > I/O Options > FM Options menu allows you to insert an external effect unit such as
a ratings encoder into the Omnia.9 processing chain at the ideal place right before the final clipper.
Please see the AM Processing section for a full description of this menu.
MPX Test Tone Generator: Control Details and Suggested Applications
The MPX and L/R Test Tone Generator controls allows you choose from several key test tones which can be very useful for
testing and proofing transmission path components.
♦ Square is a 60Hz square wave useful for visualizing tilt.
♦ Quick Sweep is a very fast 1,000 – 60,000Hz sweep with a click before each sweep, designed to offer a visual reference as
to the high frequency performance of your STL or exciter. If you were to connect an oscilloscope to a calibrated tuner
with MPX output (such as the Belar Wizard, for example) this is the shape you would see if your STL or exciter had a flat
high frequency response:
Any deviation from a flat high frequency response means a loss of loudness and/or stereo separation.
♦ Sweep (MPX) is a slow linear frequency sweep between 30 and 60,000 Hz.
♦ Log Sweep (MPX) is a logarithmic equivalent.
♦ 400Hz is a full amplitude sine wave to allow you to set an exact 75kHz deviation with a mod monitor.
♦ 0.5 – 5.0 and 0.5 – 30.0 are subsonic sweeps that allow you to see the extreme low frequency response of your air chain.
♦ 30Hz is a 30Hz sine wave. Certain exciters will go into protection mode if fed a full modulation sine wave this low in
frequency, so please be careful!
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