SDTV NTSC ( Standard Definition TV ) - 480i EDTV NTSC( E??? D???? TV ) - 480p SDTV PAL (Standard Definiton TV) - 576i HDTV - 720p HDTV - 1080i (full )HDTV - 1080p
The number stands for the resolution. The resolution is the number of lines accoss for TV which make the picture. The i stands for 'interlaced' and basically means half the lines refresh , then the other half refresh. The p stand for ' progessive' and it means ALL lines refresh at the same time.
For more information i reccomend you go to Wikipedia or do a goodle search.
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