* High definition television (HDTV) is a digital television broadcasting system with a significantly higher resolution than traditional formats like NTSC, SECAM and PAL.
* HDTV technology was first introduced in the US during the 1990s by a group of electronics companies called the Digital HDTV Grand Alliance.[http://en.wikipedia.org/wiki/High-definition_television Source]
* Today there are dozens of high definition programs transmitted in American homes around the clock. HDTV can be received today via three different systems.:
# '''Broadcast'''
#* According to the National Association of Broadcasters, currently 1,315 stations in the U.S. transmitting digital TV signals. Many of these stations broadcast high-definition content as well. HDTV is offered by CBS, NBC, Fox, WB, UPN, and PBS stations.
#* Special satellite HD receiver is required for receiving content transmitted by satellite.
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== Providers of HD channels ==
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