XPost: alt.video.digital-tv 
 From: stephen.neal@nospam.please.as-directed.com 
  
 Doug McDonald wrote: 
 > Stephen Neal wrote: 
 > 
 >> 
 >> 
 >> Glad to hear it. Intellectually it struck me as easier to do a 
 >> 480/50i to 1080/50i scale without mangling the picture 
 > 
 > Mine does NOT do 480i -> 1080i, it does 480@60i -> 720@60p 
  
 Aha - sorry - mis-applied assumption. 
  
 > 
 > 
 >> 
 >> I guess what your set is doing is similar to the DRC50/1250 settings 
 >> on high-end DRC sets sold by Sony in the UK 
 >> 
 > 
 > No, since my set is "progressive". 
  
 Yep - as mentioned above. 
  
 > 
 >> 
 >>> Currently Fox is 
 >>> doing a 480i -> 720p at the station and it is very very 
 >>> marvelous ... 
 >> 
 >> 
 >> Yep - if you have the bandwith much better to let the broadcaster do 
 >> the upconversion : 
 >> 
 >> 1. They have an uncompressed (or lightly compressed) 480/60i source 
 >> feed so will only be scaling/frame rate converting the video and not 
 >> the artefacts introduced with broadcast compression 
 > 
 > 
 >> 2. They will be using a broadcast quality upconverter rather than a 
 >> couple of dollars worth of in-TV DSP.  Should be better quality. 
 > 
 > I don't think this makes a difference ... the commercial ubiquitous 
 > Faroujda chips are excellent. The difference is in the uncompressed 
 > video coming in, with full resolution in all colors. 
  
  
 Err - but there is little difference between SDTV and HDTV in that respect. 
 Either you get a component digital 480i SDTV signal or a component digital 
 720p/1080i HDTV signal over a DTV channel surely  - no NTSC or PAL composite 
 artefacts via either delivery method - no-one actually runs stations 
 analogue these days do they ? 
  
 Certainly all UK digital TV platforms are digital component (and almost all 
 TV production these days is digital component - barring some local stuff) 
 and most set top boxes will output RGB analogue via their SCART connectors - 
 offering a major quality improvement over analogue PAL reception (assuming 
 decent DTV data rates are used - which isn't always the case) 
  
 My observations are that the conversion from 576/50i RGB to 576/100i RGB 
 (though whether this is via 576/50i and/or 100i YCrCb I'm not sure) there 
 are still observable artefacts introduced in every UK 100Hz set I have seen. 
 I have also seen Faroudja scaling  - thoug they aren't ubiquitous in 
 direct-view CRT sold in Europe (I don't think Sony, Philips, Panasonic or 
 JVC mention them in their UK bumph - though I may be wrong.)  They are more 
 likely to be seen in the non-direct view arena (front/rear projection etc.) 
 Do Faroudja do interlace->interlace conversion (i.e. 50->100 or 60->120?) 
  
 Steve 
  
 --- SoupGate-Win32 v1.05 
  * Origin: you cannot sedate... all the things you hate (1:229/2)