Dante Inovonics 552, Installation & User Manual, Page: 35 / 60

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previously, LU numbers don’t equate to much standing alone.
In the interest of loudness consistency between the analog-FM
program and, especially, the HD1 channel, these readings are
best judged against the FM audio loudness. That’s the function
of the
Relative to FM
selection, for not only do the plots on this
graph follow the loudness of the HD programs, but the ‘zero’
on the LU scale is continually adjusted to the FM audio loud-
ness. The
Absolute
selection will show the FM program together
with the HDs, but against absolute-LU values
OSCILLOSCOPE
A built-in oscilloscope utility has been included for viewing au-
dio and other waveforms. Vertical sensitivity is scaled and an-
notated with respect to the 100%-modulation point, and the
horizontal timebase adjusts for the most meaningful display of
the selected signal.
O-Scope
Applications
The primary
Oscilloscope
function is to view actual signal wave-
forms. View: buttons allow selection between MPX (the FM-
baseband signal), the
FM stereo Pilot , the
DSB
RDS
subcarrier,
and left and right au-
dio from the
FM
or
any of the HD pro-
grams.
FM/HD1
dis-
plays monaural audio
from these two hope-
fully-identical pro-
gram channels in dif-
ferent colors, pictured
here.
The Pause bar at the bottom of the screen lets you freeze the
waveform, and the little magnifying glass in the upper-right
corner gives a full-screen display.
Audio XY
Display
The ‘scope function
can also serve as an XY
“stereoscope.” An XY
display will indicate
both level and phase
differences between
left and right chan-
nels, giving a visual
representation of the
‘stereophony’ of the
program and warning
of mono-compatibility
issues.