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In Reply to: What is progressive scan ,? some DVD players have this specs . posted by Kazoz Mando on November 28, 2002 at 16:25:03:
With a conventional television, also called pan and scan, the electron gun scans every other line of the screen once every 1/30th of a second. With a progressive scan TV (like your computer monitor) the lines are scanned in succession in the same amount of time (1/30th of a second). In order to take advantage of this feature, the DVD has to have compatible circuitry. However, you won't get the advantages of a progressive scan DVD player with a conventional pan and scan TV.
Follow Ups:
Actually, the term "pan and scan" is refering to how a "widescreen" picture, usually a movie, is fit to a 4x3 screen without letter boxing the picture.Basically, instead of adding black bars to the top and bottom, each side of the frame is chopped off a bit. Aspect ratio remains correct, and no "annoying" black bars...but you dont get to see the "whole" movie.
What you described is the difference between a progressively scanned and an interlaced picture. A progressively scanned image means that all lines are drawn/refreshed in sequence. If an image is interlaced, that means that at each refresh cycle either all the odd lines or all the even lines are drawn.
There is no such thing as a "pan and scan tv", however a "conventional" [by this, I assume you mean analogue] tv is not capable of displaying a progressively scanned image.
So many terms to keep straight. Thanks for the correction.
No problem...anything to do with video almost seems to be made purposly overly confusing.I deal with this stuff everyday at work...what a pain in the butt! I love getting home to a lowly two-channel rig...and no tv.
:-)
Steve
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