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Discussion Starter · #1 ·
I have been able to get some pretty good results with SDTV and/or DVD playback @540p Powerstrip timings. However, I have been unable to generate a 4:3, 1080i configuration (e.g., 1440x1080). Is this even possible? I notice that even the ATI Radeon/Powerstrip guide at the top of this forum doesn't list any "true 1080i" modes for 4:3 HDTV sets. Also, even if possible, would I gain much in PQ with 1080i vs. 540p during, say, DVD playback? I have a 32" display.
 

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depends on the tv. some (most?) 4:3 tvs automatically go into 'squeeze' mode when the sense a 540p or 1080i setting, such as my sony. there is no way to display a 540/1080 timing without it going into 16:9. i can only get 4:3 with 480p timings. you could still generate a 4:3 pixel ratio such as 1440x1080, but it would essentially be a non-square setting.


k
 

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The 1280x1024i timings from Karnis' guide worked pretty good for me on my 36" RCA. That runs at 1080i timings but with a few extra blank lines top and bottom I think. The real benefit of that setting on my TV is that my TV doesn't do a 16:9 squeeze of 1080i signals it does some sort of strange combination of non-linear squeeze (kind of the opposite of the non-linear stretch on widescreen TVs) and hack off the sides. It's kind of anoying, but since I don't watch HDTV I can deal.


On the PQ question, my TV accepts 800x600 VGA native so I just run that most of the time. It's easier than powerstrip, and at 36" and ~10 ft there isn't realy much of a difference, both look better than "letterbox" from my progressive DVD player.
 

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Discussion Starter · #4 ·
Quote:
i can only get 4:3 with 480p timings
I'm lucky, then. I was able to get a pretty workable (though overscanned) 720x540p desktop.

Quote:
you could still generate a 4:3 pixel ratio such as 1440x1080
That I haven't been able to do :).
 

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I have the same problem too, my Panasonic (36HX41) 4:3 does the squeeze when it senses 1080i/540p. So far the best resoltuion I can use is 856x480p @ 540p timings from Karnis's guide, the 640x480 in his guide displays a square in the middle of my TV, and the regular 640x480 causes overscan, I haven't figured out how to adjust all the param. in PowerStrip yet, any idea??? Some apps require 800x600 to run on my HTPC, how do I go about fixing that if I can't run that rez or antyhing higher than 540p? Is that even possible?


Thanks,


Jamal
 

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Discussion Starter · #6 ·
Too bad about the squeeze feature, bluesjam. Anyway you can disable it in your TV's service menu? I didn't have to do that on mine, but you might want to look into it to see if you can get 540p. As far as 800x600, I think only high-end projectors or monitors can do such a thing. If your TV supports 720p (mine doesn't), you might want to try that--of course, there's no guarantee it won't squeeze that also.
 

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I also have an RCA 36" 4*3. (Its the older MM36100 direct view). It does 800*600 on the VGA input; but also accepts 1440*1080i directly on a second VGA input, for example when outputting an HDTV card. I can't output 540p to be able to tell you if there would be any difference between the 540 p you are getting and the 1080i if you could get it. The video is superior at 1080i versus 800*600; when for example I switch the output of my MyHD card between 800*600 and 1440*1080i.


Since I really don't know what the TV does to the 1440*1080i signal I suppose it is possible that it is converting it into 1440*540p for display. It was advertised with HD resolution capability - getting HD resolution but not HD signal. This would correspond to 1555200 pixels for the interlaced versus 777600 pixels if it was 540p, and contrast with 480000 for the VGA. The manufacturer claims horizontal resolution of 700 h and 950 w - which seems to imply 665000. None of these match the 864,000 pixels which RCA claims the TV can display. (Maybe that is 1440*600 and the TV somehow converts).


I am somewhat interested in this topic as I was considering going to a rear view projector to get "true" HD, but then I saw on the forum where none of these are capable of truely displaying 1920*1080i - and it makes me think maybe my "high resolution" set is a little closer to the high definition sets than I originally thought.


I can't address your DVD question as in my case I watch in 800 by 600 - which is clearly superior to the interlaced component output I get out of a dvd player (my tv does not accept progressive component -)
 

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Discussion Starter · #9 ·
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I also have an RCA 36" 4*3. (Its the older MM36100 direct view). It does 800*600 on the VGA input; but also accepts 1440*1080i directly on a second VGA input...
VGA inputs!? You lucky dog! I have only component inputs, so much of what I have said in this thread may not apply to your configuration.


BTW, using a Samsung TXM3281HF in this neck of the woods.
 

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Yup, I've got a MM36110, the newer model. Mine has 2 VGA inputs, and one component set (480i/p). The biggest improvement in PQ for me came when I switched from 480p from my DVD player to 800x600 from my HTPC. I'd have to say that while I was running at 1280x1024i the picture was approximately the same as 800x600, maybe a little bit better for video.


I'd give the 1280x1024i timings from Karnis' guide a try. At 720x540 you're loosing almost 80 lines of resolution (aprox the same as I was from my DVD player) and I noticed a difference going to a higher res (I only lose 30 lines at 800x600).


Quote:
Originally posted by RalphArch
... I am somewhat interested in this topic as I was considering going to a rear view projector to get "true" HD, but then I saw on the forum where none of these are capable of truely displaying 1920*1080i - and it makes me think maybe my "high resolution" set is a little closer to the high definition sets than I originally thought....
As to that topic, I think the issue is that most HDTV's can't resolve the full 1920 horizontal lines (something more like 1400-1600). But I definitely wouldn't let that stop you from getting one. The biggest reason I wish I'd got a HDTV is 16:9. Even on a 36" 4:3 movies are pretty small, if I'd gotten even a 42" widescreen HDTV (same picture height as mine) movies and other widescreen material would be almost twice the size they are now.
 

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Quote:
Originally posted by stanger89


As to that topic, I think the issue is that most HDTV's can't resolve the full 1920 horizontal lines (something more like 1400-1600). But I definitely wouldn't let that stop you from getting one. The biggest reason I wish I'd got a HDTV is 16:9. Even on a 36" 4:3 movies are pretty small, if I'd gotten even a 42" widescreen HDTV (same picture height as mine) movies and other widescreen material would be almost twice the size they are now.
Darn, I was trying to feel good about continually getting shot down by the wife on a rear projector or plasma, and you bring me back to the reality that I know is true.


Well at least my set is super sharp at the HD resolutions if I want to sit up close.
 

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Well, it seems like there's a mass conspircacy going arround trying to get me to spend all my money, so I need to get some payback whenever I can. (So much stuff, so little money).
 
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