Inovonics 531N, Инструкция по установке и эксплуатации, Страница: 48 / 60

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transmits HD Radio® digital carriers along with the primary FM
signal.
The
MPX FFT
plot may be saved as an image file using the com-
puter’s
Prt Scr
utility or any common ‘screen snipping’ tool.
XY Plot
In the
XY Plot
, left and right program audio channels are plot-
ted against one another in an XY ‘scope’ box. The XY display
gives a good measure of program audio stereophony , or how
‘wide’ the stereo image is, as well as a good indication of how
heavily it is modulated.
In the series of snapshots below, the first example shows a
densely-modulated program audio signal with an apparently
wide soundstage , or stereo image, very probably the result of
‘stereo enhancement’ by the station’s audio processor.
The central image is of a station ID between music cuts, which
has no appreciable L–R component, a monaural program for all
intents and purposes. Note that the plot is pretty much a 45-
degree diagonal line sloping upward. The reverse of this, or
any waveform with a diagonal tendency sloping downward,
would indicate an out-of-phase condition between the stereo
channels, as shown on the right.
The
XY Plot
may be saved as an image file using the computer’s
Prt Scr
utility or any common ‘screen snipping’ tool.