Kirk Pete
Auditioning
- Joined
- Nov 10, 2001
- Messages
- 6
Do i need a hdtv to make use of a progressive scan dvd player
The progressive scan converts the signal. Some HDTVs do that already so you can have progressive scan without it on the dvd.I'm not sure what you're trying to say here. Many HDTVs upconvert any signal they receive to 480p (or an even higher resolution). But that's a different issue.
M.
so you can have progressive scan without it on the dvd.All DVD's can support progressive scan - it is NOT something extra.
There IS an optional flag on the disk that a DVD player can use to say "Feed me video in progressive order" or "Feed me video in interlace order". But many older disks did not implement this flag correctly. This may be why this misunderstanding exists.
Aren't progressive players just line doubling? It's 480i on the disk isn't it?There are 2 main things that a ProgressiveScan DVD player will do that a Standard interlace player does not:
- DeInterlace: This is where the lines of video are pulled off the disk in natural/progressive order.
- 3:2 pull-down: Movies are shot with 24 frames per second. Video and television signals are shot at 30 frames per second. A DVD player will detect how many frames are in 1 second of video on the disk and perform a 'trick' called 3:2 pulldown to make a movie play correctly on your television. (See our Primer/FAQ for more detail).
Line Doubling: A DVD player normally does not do this. A HDTV will take the analog video, re-digitize it and then attempt to add rows of video so that it matches some internal format. Some HDTV's use 512, 520, 700, 720, ... etc as a internal format. Signals below this format are "line doubled" or "up converted" to the internal format. Signals like 1080i that arrive are "down converted" to the internal format. The rest of the television is optimized to handle & display this internal format.
It's actually very hard to make the internal electronics handle all 3 major formats (480, 720, 1080) WITHOUT some compromise unless they create a lot of extra electronics. By converting to some single, internal format the designers can optimize both the electronics and optics to create a rather nice picture.
There was a long thread in the "Display Devices" fourm that discussed the merits/problems of different internal formats. I think no clear conclusion emerged that any brand of HDTV did a better/worse job than any other.