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OG Xbox Forums => Dashboard Forums => EvolutionX Forum => Topic started by: storm_raider on November 18, 2002, 05:18:00 AM

Title: Progressive Scan?!
Post by: storm_raider on November 18, 2002, 05:18:00 AM

Can some explain to me what exactly is (Progressive Scan)

and what does it do?


cheers!

Title: Progressive Scan?!
Post by: BenJeremy on November 18, 2002, 12:52:00 PM

Erm..... no.

Actually, Progressive means that the signal sent to the TV is not interlaced.

(Time for lesson in interlaced TV):

Once upon a time, it was decided that NTSC video would display 'around' 480 lines of resolution, but would 'interlace' the display, showing the even rows in one field, and the odd rows in the next. So in reality, you get 240 lines of resolution, but a different set every 30/th of a second.

Progressive scan means that ALL 480 lines are sent to the TV in a single field. This prevents the slight stroboscopic effect of 'flicker' and allows a much sharper image to be seen.

In HDTV monitors, you can usually display 480 lines in progressive... in "SOME" you get true 720 lines of progressive scan display, and true 1080i interlaced. HOWEVER, this is not always the case. Some so-called HDTV monitors only do 480p and scale down the other resolutions to fit.

Non-HDTV monitors or TVs cannot do progressive scan (which uses Component Video cables, a cable with 3 BNC connectors just for the video connection).

Title: Progressive Scan?!
Post by: gnutellafan on November 18, 2002, 01:02:00 PM

I know that there was a hack for progressive scan DVD output but was there ever anthing released to make this hack easy?

Title: Progressive Scan?!
Post by: Oldie on November 18, 2002, 01:08:00 PM

There is a "generic" patcher released...

Progressive Scan Patch

A member of the xboxhacker.net boards made it.

Later,
Oldie

Title: Progressive Scan?!
Post by: BenJeremy on November 18, 2002, 01:15:00 PM

QUOTE (Oldie @ Nov 18 2002, 03:58 PM)

Progressive scanning refers to the way the display device is updated with information. Regular NTSC TV's are interlaced at 480 lines of resolution, which means during each scan interval, only 1/2 of the lines (240) are drawn at a time.  The common designation for this is 480i Progressive scan displays are capable of drawing the entire 480 lines during each refresh interval.  The common designation is 480p. Since information changes from one scan to the next, the interlaced picture can appear "fuzzy" next to the progressive picture.  All (current) PC displays are progressively scanned. Later, Oldie BenJeremy - Didn't see your reply, but you are right on as well.  One thing though - as you know, a TV that only does 480p is not an HDTV - and there are some tv's out there like that - large picture tubes and smaller rear proj. TV's mostly.  They are not HDTV's but can do 480p and the manufacturers don't mislable them as HDTVs (imagine that).

                                    Well, I know there are some standard ratio (4:3) TVs that had component video connectors. Thanks for clarifying that.

I have a buddy who's looking at buying an HDTV monitor, and I was just amazed at the sly marketing of these things. Gotta be VERY CAREFUL these days!! Almost all HDTV monitors claim 1080i compatiblity, but in reality, many are 480p units scaling the images down.

There is apparently a market-speak term for 'true' 720p monitors, but it escapes me at the moment.

Title: Progressive Scan?!
Post by: switzch on December 01, 2002, 05:31:00 PM

Quote

i have a Sony 32" WideScreen with Component connectors, can i usa Progressive scan?

Title: Progressive Scan?!
Post by: dsswarehouse on December 02, 2002, 07:39:00 AM

man if you can get progressive u need to have it way better picture