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WHY YOUR HDTV ISN’T HI-DEF ENOUGH: The Real Story of HDTV Standards—There Aren’t Any. In order to qualify as hi-def, a signal must have either 720 horizontal lines of progressively scanned pixels (720p), 1080 lines of interlaced pixels (1080i) or 1080 lines of progressively scanned pixels (1080p, which nobody even broadcasts yet.) But there’s a whole lot more to the quality of digital television than the number of pixels present. After all, 1080 lines of poor-quality pixels may technically be