Just from a raw pixel rate you've got this:
Signal Resolution Pixels Relative pixelrate
NTSC: [EMAIL PROTECTED] = [EMAIL PROTECTED] = 1:1 (480i)
Actually, as I understand it, broadcast NTSC can be more accurately
presented at around 352x480, perhaps 480x480 at most. SDTV (which
would describe what you get from an interlaced DVD or a digital SDTV
broadcast) is as much as 720x480i.
You are pretty much correct... I just said NTSC as opposed to PAL
DVD. NTSC spec is an *analog* spec, which is rather subtle to describe in
terms of a digital resolution... thus the reams of disinformation and
misunderstanding. Broadcast NTSC has 6MHz channels, but due to the VSB
modulation frequency folding, 4.2MHz is allocated for video. At 80
"lines" per MHz, that's 448 4:3 horizontal dots. With a 0.7 Kell factor,
that amounts to 640x480 maximum "perceived" resolution. DVD is a little
better than that at 720x480. The OP was talking about MPEG2 though...
so DVD resolution is a valid comparison.
480p: [EMAIL PROTECTED] = [EMAIL PROTECTED] = 2:1
Known as EDTV though in theory that's any progressive frame rate. This one
confuses me a bit. Films are shot at 24fps, so therefore doing them at
60fps interlaced (30 full frames/second) contains as much information as
doing them at 30fps or 24fps progressive. With the right decoders should
be able to lok th same.
Yes... do a little reading on 'telecining'.
-Cory
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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