Definition: Digital Radio works by transmitting digital audio and data alongside existing AM and FM analog signals, allowing listeners to enjoy CD-quality sound and virtually eliminating the static and hiss associated with today's analog broadcasts. The technology also provides a platform for new wireless data services that, combined with display screens on HD Radio-enabled receivers, will deliver listeners a variety of additional information such as song titles, artist names, traffic updates, weather forecasts, sports scores, and more. (from Ibiquity, the sole develope of HD Radio in the U.S.)