Originally Posted by rbinck

If it ain't listed as a valid HD format, It's not HD. And that 1080 vs 540 dosen't make 540p HD because 540p is not in the list of ATSC formats. The progressive vs interlaced thing only really applies with computer monitors. TV is a whole different animal. That motion blur thing is way overblown. See http://highdefforum.com/showpost.php...14&postcount=5 for discussion on pixel straddling which is just as much a distortion.

Pretty much all HDTV monitors will scale the input received to add overscan. Take for example you have a 720 line fixed pixel display. You can not display all 720 lines received because the first few lines will contain video noise. The broadcasters have been using this area for years to embed data. The least amount of overscan generally acceptable is 2%, so only about 705 lines can be shown. Those 705 lines will be scaled to fit the 720 lines your display has. I used the vertical, but the horizontal is scaled in the same manner. So it really dosen't matter much as you have to have a weird resolution to get back to a 1:1 pixel mapping and generally only possible with a computer and a display that will tolerate expanded timings.