page 1 – 2
FM-531HD / May 2013
G E N E R A L I N F O R M A T I O N
General Information
Introduction
Welcome to the FM‑531HD Digital Audio Processor from Wheatstone. The FM‑531HD
has been carefully designed to deliver a clean and easy to listen to sound on the dial along
with very competitive loudness if that is the goal. The FM‑531HD expands on technologies
previously invented by Wheatstone, incorporates several technologies not available in other
processors, and delivers that “sought after” sound to traditional analog FM transmission.
Like other Wheatstone processors, the FM‑531HD has been carefully designed to not have
a fixed sound of its own – the end user is free to use the vast pallet of tools to create any
desired on air sound.
The processing algorithms of the FM‑531HD have been carefully evaluated though
thousands of hours of critical listening and with a very wide range of program material. The
FM‑531HD can deliver a clean, clear, and if desired, loud on‑air sound. Music sounds like it
was meant to sound. Voices are rich and full and without unnatural coloration or distortion.
Transitions between widely varying program elements are deftly handled, and if desired,
with no trace of “processing” during spectral balance and density corrections.
Remote control of the FM‑531HD is via Windows‑based Graphical User Interface (GUI)
software and can be accomplished via 100BaseT wired Ethernet. Up to four simultaneous
remote control sessions are possible. Eight rear panel General Purpose Inputs (GPI) are
provided to allow hardware‑level interfacing of the FM‑531HD to station systems.
The Wheatstone FM‑531HD utilizes an internal base sampling rate of 192 kHz. Far
higher sample rates are used where it is beneficial to do so, such as within the clipper.
A 24‑bit, 144dB internal dynamic range signal path allows audio to be processed with ex‑
treme precision.
For complete control over all of the available processing parameters a full‑control GUI
intended for processing experts can be obtained by registering for it at http://www.wheat-
stone-processing.com Registered users can download a full‑control “Pro‑Version” of the
GUI which provides full access to 300‑plus processing adjustments.
All Wheatstone products are designed and manufactured by Wheatstone in its Corporate
Headquarters in New Bern, North Carolina, USA. This large, state of the art facility affords
complete control over product quality during every step of the manufacturing process. In
order to maintain the high product quality standards that Wheatstone is known for nearly
40 years, no offshore manufacturing is utilized.
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...