Engadget has an interesting column answering the question why there are actually 18 standards for HDTV.
"First, to be technical, there are eighteen different ‘ATSC DTV (digital television) formats’ of which only six are actually High-Definition. Of the six HDTV formats only two are used frequently, 720p and 1080i. That doesn’t really answer the question, but it narrows the field down a bit and gives us something to work with. "
Read the more on Engadget.
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