Definition: HD Radio technology transmits digital audio and data alongside existing AM and FM analog signals.
According to Ibiquity, the developer of this technology makes "...your AM sound like FM and FM sounds like CDs."
Ibiquity also says HD Radio offers "FM Multicasting - the ability to broadcast multiple program streams over a single FM frequency", "Static-free, crystal-clear reception", and "A variety of 'data services' including text-based information..."
