Nautel HD Multiplex Technology Promises Increased FM Band Capacity
New concept in HD multicasting enables up to 15 independent stations within 600 kHz of signal bandwidth and 9 within 400 kHz.NAB 2015, booth C2139 – Nautel Limited has announced the development of Nautel HD Multiplex, a technology that will enable the placement of up to 15 audio streams or stations within 600 kHz of signal bandwidth or up to 9 audio streams in 400 kHz of signal bandwidth.
The technology allows the combination of multiple independent IBOC exgine modulators into a single HD PowerBoost crest factor reduction engine, permitting 2 or more IBOC stations to be amplified using a single transmitter and subsequent antenna system. (Nautel’s HD PowerBoost uses an intelligent peak to average power ratio – PAPR – to increase HD Radio™ power output while at the same time increasing efficiency.) The all-digital IBOC configuration is capable of carrying up to 3 times the standard IBOC content. The methodology also maintains backward compatibility with existing receivers by ensuring the standard sideband channel separation within the multiplexed signal.
A transmitter operating in HD Multiplex mode could provide coverage comparable to a higher-powered hybrid analog/digital transmitter. Through modification of the established IBOC crest factor reduction, Nautel’s HD PowerBoost could operate on all of the independent stations transmitted using HD Multiplex.
“This technology opens up some exciting opportunities for broadcasters,” said Kevin Rodgers, Nautel President and CEO. “A station considering HD conversion could test the waters by leasing an audio stream on the multiplex. AM stations could be moved to the FM band, as proposed by some countries. Netcasters could place their most popular streams on an over-the-air signal. In many cases, this could provide new revenue for broadcasters through leases or ad insertion in the various streams. Further, small markets could have a broad variety of diverse formats served by a single low-cost station.”
Nautel demonstrated a working prototype of HD Multiplex at NAB 2015 to foster discussion within the broadcast community. Based on feedback from broadcasters, Nautel will determine the appropriate path for further development of the technology and application for regulatory approvals.
Nautel has emerged as one of the world’s largest manufacturers of broadcast transmitters. With more than 14,000 transmitters deployed in over 177 countries since 1970, Nautel continues to lead the way in providing valuable new solutions for digital broadcasting and other applications.
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