HDTV Forum

720p and 1080i require about the same bandwidth, 45~50megabits/sec.
While 1080p needs about 74megabits/sec.
The band width of ATSC broadcast channel is 18megabits/sec.
Interlacing is a from of compression that can be used with analog and digital transmissions.
1080i will be with us a long, long time.
With CRTs the driving circuity is one of the main limiting factors.
Yes, the best way would be to capture both of the 540line fields from a 1080i signal and then display them progressively.
I have 26" CRT HDTV that only has interlaced component inputs, but displayes the image progressive.
Finding out what methods a HDTV set maker used is not easy. The published specs don't all wise tell the whole story. John

I have 26" CRT HDTV that only has interlaced component inputs, but displayes the image progressive.

Are you saying you have a CRT that does 1080P? what brand and model?

If you mean it will take interlaced SD and convert that to 480P, that makes sense.

Hard to do.
I have Samsung 47" CRT-RP that will handle a 1080p WMV encoded DVD via DVI from my PC. But handles 480i/p, 720p and 1080i via component and OTA ATSC.
The 26" is a Phillips CRT direct view that says it displayes everything progressive, so far viewing support this claim. BUT the 480 component input is interlaced only, strange. John

I have Samsung 47" CRT-RP that will handle a 1080p WMV encoded DVD via DVI from my PC.

If you are getting 1080P to the display it is being chopped up into 1080I. No consumer CRT RP can do 1080P... Same goes for that 27" too..

In fact I have a hard time believing your video card is really set for 1080P since I can't think of any display like that which would accept 1080P input of any variety. Most likely the card is set for 1080I and that would not prevent you from playing that disc and seeing an HD image on the display.

I don't want to spend the BIG$$$ for an Extron scan rate analyzer.
When I play the WMV HD DVDs, part of the start routine is to analyze the PC, Video card and the display(my 47"CRT-RP) the results says that I have my choice of 720p or 1080p. I choose 1800p, I assume that it's 1080p/24, but without a scan rate analyzer I don't know for sure. John

I don't want to spend the BIG$$$ for an Extron scan rate analyzer.

You don't need to...

CRT never did 1080P unless it was a very pricey front projector and even those were hard pressed to truly resolve 1920. What is the model number of your Samsung... sure it isn't a 1080P DLP?

Next time I hook my PC up to it I will check out the display modes that it will support via DVI.
With consumer gear it is usually hard to find out what the true specs really are. John

Defintiely check out what is going on because that TV does not accept a 1080P anything because it it is 1080I and possibly multiscan adding 480P to your native capability.

As for specs and truthful disclosure come visit us.

This series of articles will definitely get you up to speed and have you understanding specs and their inherent limitations like a pro!

Video Waveform
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akirby wrote:One of my favorite quotes of all time!

which one?