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uk.tech.digital-tv (Digital TV - General) (uk.tech.digital-tv) Discussion of all matters technical in origin related to the reception of digital television transmissions, be they via satellite, terrestrial or cable. Advertising is forbidden, with no exceptions.

Progressive Scan DVD Players



 
 
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Old July 27th 03, 11:23 PM posted to uk.tech.digital-tv
Stephen Neal
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Posts: 98
Default Progressive Scan DVD Players

On 27/7/03 3:38 pm, in article , "Keith
Bailey" wrote:

I have read the really good explanation of progressive scanning at
http://www.hometheaterhifi.com & I can see that it has significant
advantages for NTSC which uses 3:2 pull down to display 24fps film on a
60 field display.


Yep - there are huge advantages to removing the 3:2 pull down artefacts
inherent in 60Hz interlace transfers.


I'm not so sure that there is as much improvement for PAL which uses 2:2
pull down & so just needs to interpolate the two fields into one 25Hz
frame


Well if you can merge the 2 fields into one frame then you can then display
each frame twice with no motion judder (as the two fields are time
co-incident in film) and avoid interlace twitter that would otherwise happen
if you just displayed each field consecutively.


I have a Hitachi TV which offers progressive scan & I use this for
displaying normal TV broadcasts froma Freeview box. I know that this is
really no more than a field store but it does improve the perceived
vertical resolution.


It should improve film/flickered video - but it may not improve normal 50Hz
video as it is interpolating extra motion information to make-up the "other"
field that is not broadcast.


Does anyone have any first hand experience of a progressive scan DVD
player in the UK on PAL connected to a display device such as a
projector or plasma where any improvement would be most noticeable.


Suspect that film sourced material (where there is no inter-field motion)
will fair better than video material (where there can be motion between
fields)

Steve

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