November 5, 2009
Danielle Deabler, NPR
Blanket 6 dB increase, interference safeguards
recommended to FCC; higher power levels possible
“We are delighted that the radio industry is now poised to push this technology ahead together. We’ve found practical and balanced solutions that will greatly improve reception while limiting interference to existing analog operations,” said Bob Struble, President and CEO of iBiquity Digital Corporation.
The agreement proposes that the Commission authorize a blanket 6 dB increase for all commercial and non-commercial radio stations’ digital power from the current level of -20 dBc to a power level of -14 dBc; this is four times the current power level. NPR and iBiquity consulted with a broad spectrum of commercial and noncommercial stations over the last few weeks, and identified several conditions and criteria to manage the power increase process. These conditions were informed by NPR Labs recent field research, “Advanced IBOC Coverage and Compatibility Study,” filed with the Commission earlier this week. Conditions of the blanket increase included commitment by iBiquity and NPR to additional enhancements to the HD Radio™ system. The development work of the two organizations will focus on single frequency networks to fill gaps in digital coverage, asymmetrical digital sidebands to reduce the potential for digital interference to short spaced first adjacent analog stations, and low bitrate codecs and conditional access crucial to moving radio reading services into the mainstream of digital radio broadcasting.
Notably, the two organizations offered an approach to additional power increases beyond a 6 dB increase, depending on spacing criteria and conditions that limit harmful interference, and initial models suggest most stations will be able to exceed 6 dB.
Mike Starling, Executive Director of NPR Labs, said “We are optimistic about the future of HD Radio™ broadcasting, and eager to continue to work with iBiquity on the developments that will make this power increase work to everyone’s advantage – stations, listeners, and receiver makers.”
"I am thrilled that a workable and efficacious compromise has been agreed to on this extremely important and controversial issue," said Milford Smith, Vice President of Radio Engineering at Greater Media, Inc. "Replication of analogue coverage by the new, digital service is absolutely critical to the continued successful roll out of HD Radio™ technology."
iBiquity and NPR encouraged the Commission to act on unresolved complaints in cases in which interference is shown to cause a problem.
The agreement also proposes a series of steps drawn from the current AM rules for interference to be applied to qualifying and limiting harmful interference with analog at the 6 dB increase level (-14 dBc). These steps would remediate harmful interference from any stations increasing power above the existing -20 dBc power level.
About iBiquity Digital Corporation
iBiquity Digital Corporation is the developer of HD Radio™ technology, which is fueling the digital radio revolution in the United States and around the world. The digital technology enables broadcasters to offer new FM channels through multicasting, crystal-clear sound and data services on both the AM and FM bands – all free, with no subscription fee. Leading broadcasters, consumer electronics manufacturers, automakers and retailers are committed to HD Radio technology. iBiquity Digital is a privately held company with operations in Columbia, MD, Auburn Hills, MI, and Basking Ridge, NJ. For more information, please visit http://www.hdradio.com and http://www.ibiquity.com.
NPR is an award-winning, multimedia news organization and an influential force in American life. In collaboration with more than 880 independent public radio stations nationwide, NPR strives to create a more informed public - one challenged and invigorated by a deeper understanding and appreciation of events, ideas and cultures. -NPR-