By Mark Glaser in the Online Journalism Review:
"But wait, there's a white horse on the horizon for radio broadcasters in the United States: HD Radio. This allows stations to offer their current analog signal, as well as a digital channel that delivers higher quality sound — and data — to special receivers. As with satellite radio, HD Radio would vastly improve the signal quality and reduce interference, but there would be no subscription cost. (For a clear explanation of how HD Radio works, see this page.)
Backers of the new technology say that AM radio in HD sounds like FM radio, and FM radio is CD quality. But perhaps the most exciting part of HD Radio is that one station on one frequency could serve multiple digital streams — meaning a public station could have news on one channel, classical music on another and public affairs programming on another. Plus, there's the possibility of rich data services such as local weather and news beamed to portable devices in the future, as well as audio on demand and time-shifting similar to TiVo on televisions."
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