How is digital TV different from analog?,
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This clip makes two points. First, analog’s signal is different than digital’s because it talks to the tuner in a different way. Second, the only thing that’s changing in your television is that it needs a new tuner to understand the digital signal. Bill Hayes and Gary Sgrignoli explain. Visit http://iptv.org/digital/ or call 1(800)532-1290 for more information.
See also Step-by-step DTV: http://www.iptv.org/iowajournal/story.cfm/419,
