Our FM-531HD is a 1RU on-air processor for FM/HD use. Packaged in a compact, 1RU form factor, this new processor brings the multiband precision of our flagship AirAura processor to a budget-friendly price point. Its Vorsis Ultra High Resolution processing technology delivers superb on-air sound that’s loud, yet detailed.
Features include a distortion-managed final clipper for squeaky-clean audio, smart stereo enhancement, bass management for deep, yet clean bass, and Sweet Spot Technology for consistent sound regardless of density variations in the source material.
The technology utilized in our new FM-531HD final peak clipper does not generate the objectionable aliasing and intermodulation distortions commonly associated with less-complex clipper technology.
Similar in certain ways to our acclaimed 31-band 'Fine Grain' limiter (a Vorsis exclusive), the FM-531HD utilizes high resolution distortion recognition algorithms to discern audio from distortion. The fine-grained selectivity afforded by this technology is the best way to sense and truly mitigate distortion. Other technologies can only make a "best guess" at separating desirable audio components from undesirable distortion products.
By analyzing the audio and the distortion products created during peak control, the FM-531HD removes distortion products and other artifacts that a listener might find objectionable. It is highly adept at minimizing intermodulation distortion, especially close-spaced difference frequency intermodulation products in the midrange frequencies where human hearing is the most sensitive.
"Full Detail" processing overcomes the limitations of peak limiters in other on-air processors. Using 31 limiter bands selected according to ISO standard 1/3 octave center frequencies the FM-531HD limiters (one for FM, one for HD) perform precision spectral energy control without generating additional density or artifacts usually associated with peak limiters having fewer bands. Operating according to accepted principles of human psychoacoustics, the action of the Stealth Limiter™ goes completely unnoticed by the ear. Because of the need for very shallow limiting in each band, there are absolutely no 'swishing' artifacts and no unnatural density buildup; just increased on-air loudness, detail, and "listenability" of the station's programming.
Sweet Spot Technology (SST) has been designed by Vorsis to manage the behavior of the multiband AGC as program content density changes, something a typical broadband AGC simply cannot do. It effortlessly handles transitions between the hyper-compressed recordings of today and those of the past that have considerably more dynamic range. SST achieves uncannily natural-sounding consistency in both on-air loudness and spectral balance regardless of density variations in the incoming source material.
The Vorsis Bass Management System (VBMS) enhances deep bass and impact without affecting the cleanliness of mid and high frequency program. Bass detail and the clarity of higher frequency audio are enhanced by this powerful, innovative algorithm. With VBMS’ ‘Texture’ and new ‘Sub’ controls, on-air bass has never sounded sogood and so deep and natural.
Exclusive to the Wheatstone line of audio processors is the Multipath Limiter. This single user control can help mitigate the audible effects of multipath as well as reduce receiver-induced stereo blend by limiting the amount of L-R as a percentage of L+R for a more consistent and predictable sound.
Stereo enhancement is a standard feature on all Vorsis on-air processors and utilizes a new Vorsis technology: Smart Stereo Enhancement. Operating in the sum and difference domain and utilizing specialized spectral management algorithms, it provides a smooth, natural, wide listening experience without triggering multipath effects. It delivers an extremely stable 'on-air' stereo image that's exciting to listen to. Users have reported hearing, for the very first time, artistically important nuances in familiar music that could not be heard when that material was processed by other on-air processors.
The FM-531HD is fully compatible with the WheatNet-IP Intelligent Network.
Wheatstone’s baseband192 is an open standard technology that eliminates the use of an analog composite interface between processing and transmission, which has been the last holdout to the 100% digital air chain.
A single AES/EBU cable between a Wheatstone processor and a current solid-state FM transmitter carries the baseband signal, bypassing the need for multiplexing in the exciter and eliminating the resulting signal overshoot with associated loudness tradeoff. The baseband192 interface is now available as a standard feature in Wheatstone AirAura X3, FM-531HD and VP-8IP audio processors.
See more at: Wheatstone Audio Processing Technology Overview
Nominal Operating Level -20dBFS digital, +4dBu analog
Latency (FM Section) 15.4ms, analog in to analog out, 14.2ms, AES in to AES out
Latency (HD/DAB Section) 11.2ms, analog in to analog out, 12.6ms, AES in to AES out
ANALOG LINE INPUT
Type electronic differential, RFI suppressed
Input Impedance >10K ohm (bridging)
Optimum Source Impedance <1k ohm="" p="">
DIGITAL LINE INPUT
Data Standard: AES3 (AES/EBU), two channel stereo
DIGITAL LINE OUTPUT
Data Standard: AES3 (AES/EBU), two channel stereo
DIGITAL LINE OUTPUT
Transmitter link (baseband 192)
Data Standard: WheatNet-IP, two-channel stereo.
Automatic failover to alternate audio input source if audio fails on primary input.
VOICE SYMMETRY PHASE ROTATOR
Makes voice waveforms more symmetrical to reduce processing distortion.
Three separate four-band parametric equalizers:
EQ Set 1: pre or post 5-band AGC
EQ Set 2: post HD/DAB multi-band limiter
EQ Set 3: post FM multiband limiter
FIVE-BAND AGC/COMPRESSOR with ADVANCED SST™
AGC operates in sum/difference domain.
Exclusive Vorsis SST retunes the five band AGC/Compressor to maintain
consistent program density as programming elements change.
31-BAND ‘FINE GRAIN PROCESSING’ MULTIBAND LIMITERS
One 31-band section is assigned to FM signal path
One 31-band section is assigned to HD signal path
FM section operating modes: Independent, Wide, and Timbral
VORSIS BASS MANAGEMENT SYSTEM (VBMS)™
VBMS-II intelligently minimizes bass induced intermodulation distortion and improves bass impact. ‘VBMS Texture’ control also permits fine tuning of how deep bass sounds on smaller loudspeakers. Bass Tools adds virtual subwoofer capabilities, extending a floor feel by intelligently enhancing frequencies in the 40-90Hz range.
Advanced ‘distortion aware’ final peak controller intelligently manages processing artifacts to minimize or even eliminate audible processing and intermodulation distortion.
DSP-BASED STEREO GENERATOR
Stereo Width Limiter to automatically minimize multipath distortion
Dual SCA/RDS/RBDS Inputs
Dual Composite Multiplex outputs
LONG AND SHORT FORM PROGRAM SCHEDULER
Automatically changes presets daily, weekly, or as desired, including long-form ‘once in the future’ preset changes.
ACI (AUTOMATION CONTROL INTERFACE)
Responds to commands from program automation system via Ethernet connectivity. Commands from program automation can change presets or even modify individual processing adjustments without changing presets.
Remote control is by dedicated Windows-based Graphical User Interface with connectivity via 100BaseT wired Ethernet.
GPI (GENERAL PURPOSE INPUT)
Eight optoisolated logic inputs are slaved to first eight preset storage locations.
90-240VAC, 50-60Hz, <100VA
19” wide, 1.75” high, 13.75” deep (16” with connectors)
Operating Manual, Windows-based Audio Processing Guru® Control Software, 6’ IEC power cable, CDROM containing manual in PDF form, Factory Default Preset Library.
GUI Pro Software, which allows unlimited access to every processing parameter, is available as a free download at wheatstone-processing.com.
This full-color brochure describes the FM-531HD Digital Audio Processor.
Jeff Keith, in this white paper, indicates effective measures for dealing with Multipath issues.
In this White Paper, published in the Septemnber Radio World Engineering Extra, Jeff Keith explains baseband192 technology.
How can radio stations enhance their relationships with listeners? One way is through better use of audio processing technology. Because audio processing is such a subjective topic, we asked a wide variety of individuals to contribute their views. You'll hear from 26 processing experts in this new white paper.
A white paper by Josh Gordon discussing the changing role of audio processing in the radio industry.
This brochure describes the entire line of Wheatstone's audio processing products.
This paper examines QoS, transport, protocols and other issues relevant to extending AoIP networks for sharing resources and controlling studios across a wider area network.
Shows the new products we are working on for 2016
A full-color brochure describing the BLADE-3 line of WheatNet-IP network access points.
This brochure provides overviews of the entire WheatNet-IP Intelligent Network. It includes technical details as well as acts as a catalog for all Control Surfaces, BLADES and Accessories.
This is the owner's manual for the FM-531HD audio processor.
A document describing configuration of the Cisco 3750G, 3560G, 3650 and 3850 ethernet switches for use with the WheatNet-IP Intelligent Network.
This is a technical manual covering all of the WheatNet-IP BLADE-3s.
This document shows simplified diagrams of the proper wiring and connections for logic I/O on WheatNet-IP BLADEs.
This document is a brief description of the logic function names used in the Wheatstone WheatNet-IP system.
IP Audio Networks: Planning for Reliability A white paper by Andrew Calvanese, VP Engineering, Wheatstone Corporation
WheatNet-IP brings added convenience and simplicity to the configuration of a PC- based automation system such as RCS Zetta. Where once it was necessary to employ a specialized sound card, discrete analog or digital audio wiring, a logic interface, and control cabling, with WheatNet-IP’s PC Driver, we can accomplish all of this over a single Ethernet cable. The driver effectively acts as a WheatNet-IP BLADE, and lets the PC enjoy full access to all aspects of the WheatNet-IP intelligent network. The driver is available in versions that offer one, four, eight, twelve, and twenty-four stereo input and output channels. For situations where discrete outputs from Zetta players are desired, we recommend at least the four-channel version of the driver.
This is a GREAT article from Pro Audio Asia...
Reprint of October 2016 article from Radio Magazine on the Hubbard broadcasting in Phoenix.
Saga Modernizes with Wheatstone by Jeff Den Adel, Engineer, Saga
Building an AoIP Network with BLADES by Amanda Hopp
IP At Center of Rogers' Console Decision by Mike McCabe, Engineerin Manager Rogers Broadcasting
A look at sending audio over IP via packets, and network considerations such as latency and jitter. A Radio World Engineering Extra by Greg Massey and Jon McClintock. Reprinted by permission.
Wheatstone Processing Videos
In January 2017, Mike Erickson sat down with Scott Fybush to talk all things processing. We shot video of the conversations and got some exceptional stuff. Learn about what it takes to provide modern, airwave-dominating clean sound that listeners rave about.