1. 
   HD Radio
   (from the article `Media and Publishing`) Some stations experimented with less-rigid music formats, and others took advantage of technology for digital radio broadcasting. In the United ...
   Found op http://www.britannica.com/eb/a-z/h/27
   
   
2. 
   HD Radio
   HD Radio, which originally stood for "Hybrid Digital", is the trademark for iBiquity`s in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations to transmit audio and data via a digital signal in conjunction with their analog signals. It was selected by the United States F...
   Found op http://en.wikipedia.org/wiki/HD_Radio
   
   

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