New standard feature for FM-55 and SG-192 reduces processing artifacts for short-spaced FMs using BS.412 MPX power control to reduce adjacent channel interference.
NEW BERN, NC, USA (October 27, 2016)
Wheatstone announced today its new Multiplex Power Wizard, a new feature for its FM-55 audio processor and SG-192 stereo generator that reduces or eliminates the undesirable audio effects usually associated with the restriction of multiplex (MPX) power to minimize adjacent channel interference.
The new feature is targeted at broadcasters in Europe and other regions where short-spaced FM frequencies necessitate the reduction of average RF sideband energy through restrictive MPX power control.
With this new feature, broadcasters will be able to keep multiplex power pegged up to the legal limit as set forth by the European ITU-R BS.412-7 modulation standard, but without objectionable processing artifacts such as gain swelling or gain pumping. The Multiplex Power Wizard utilizes a program-dependent prediction, detection, and measurement algorithm that continuously adapts the multiplex power controllers behavior to the incoming program content. The algorithm allows for the extremely tight multiplex power control desired by broadcasters, but without contributing noticeable or undesirable control-related audio artifacts.
Multiplex power controllers add yet another layer of processing on top of what is already being done by the processor, but our philosophy is that an MPX power controller should be able to do an exemplary job of controlling MPX power, and do so without compromising a stations sound, says Jeff Keith, Wheatstone's Senior Product Design Engineer.
Wheatstone's new Multiplex Power Wizard incorporates new processing techniques that can tightly control multiplex power without affecting audio quality. The Wizards location in the signal path permits it to be aware of audio power increases generated by all prior processing, including pre-processing that may have occurred prior to the FM-55 or SG-192. Energy increases contributed by the main and composite clippers are also accounted for, and it doesn't matter how hard the clippers are driven or what pre-emphasis curve is in effect. Multiplex power is always effectively controlled.
The Multiplex Power Wizard is a standard feature in FM-55 audio processors and SG-192 stereo generators running software version 1.2.19 (or higher). Version 1.2.19 software can be downloaded free of charge from the Wheatstone web site. For questions, contact Wheatstone customer support at (252) 638-7000.
ABOUT WHEATSTONE CORPORATION
Located in New Bern, North Carolina, USA, Wheatstone Corporation designs and manufactures professional broadcast audio equipment under the WHEATSTONE, AUDIOARTS, and VOXPRO brand names. Products include digital audio consoles and control surfaces, analog audio consoles, networked digital audio systems, audio-over-IP, digital audio editing hardware and software, signal processing for on-air and studio applications, pre-wiring, and software.
Wheatstone, Audioarts, and VoxPro are registered trademarks of Wheatstone Corporation. All other trademarks are property of their respective owners.
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New standard feature for FM-55 and SG-192 reduces processing artifacts for short-spaced FMs using BS.412 MPX power control to reduce adjacent channel interference. 
