High Definition Television [HDTV]

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HDTV = 640×480 up to 1440p televsion on newer televisions branded as HDTV. Its hallmark is being broadcast in digital format, either ATSC (off the air) or QAM (cable/satellite)

Virtually all HDTV signals over cable are not only QAM but encrypted as well, which no HDTV tuner can decode yet. This is why all but one HDTV card only support ATSC and make you stick an antenna on top of your PC.

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