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FM-531HD / May 2013
F M - 5 3 1 H D G U R U G U I
The FM Digital output available as AES3 digital signal or baseband192
digital multiplex signal.
The FM AES3 Digital output offers options for applying
De‑Emphasis that is complimentary to Pre‑emphasis
that may be in use and also allows the digital output to
be taken before or after the FM Diversity Delay. To select the type
of pre‑emphasis, please see the ENCODER section below. Besides
de‑emphasizing the output, the signal can be routed pre or post the
FM diversity delay.
The HD Output has options for reversing the phase of
the left and right signals as well as for swapping the left
and right channels.
NOTE: The Analog Output Type box needs special mention!
Unlike other audio processors FM-531HD’s balanced analog
outputs can also carry balanced composite stereo. When the MPX
check box is selected, the rear panel TX-1 and TX-2 BNC connectors
are carrying the standard unbalanced composite stereo signal – at the
same time the XLR outputs are carrying balanced, line level composite
stereo. This feature has distinct advantages when the ultimate signal
to noise ratio is desired and the exciter being fed has a differential
input stage (most, if not all modern exciters do).
When the L/R Discrete or L/R De-Emphasis check boxes are checked an FM Analog
Output level control will appear in this screen and the TX level controls in the Encoder
screen will vanish.
Stereo Encoder Menu
The FM‑531HD contains a mathematically perfect stereo encoder whose performance
is limited only by the high speed output Digital to Analog converter (DAC) and its recon‑
struction filter. Stereo separation is typically >60dB between 20Hz and 15kHz. Clicking
on the Encoder tab opens the Stereo Encoder screen hosting controls for this section.
MPX Processor Style
The FM‑531HD provides two methods to process the composite stereo waveform.
These two methods are provided to allow the user to select what is most appropriate for
his format and market.
Summary of Contents for FM-531 HD
Page 2: ...Technical Manual Wheatstone Corporation May 2013 FM HD Digital Audio Processor FM 531hd...
Page 122: ...page A 2 FM 531HD May 2013 A P P E N D I C E S Appendix A General Specifications A 3 Contents...
Page 128: ...page A 8 FM 531HD May 2013 A P P E N D I C E S Appendix B FM 531HD GPI Interface A 9 Contents...