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480i vs. 480p?

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Old 11-14-2006, 08:33 PM   #1
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Default 480i vs. 480p?

Time Warner is my cable provider. I have Scientific Atlantic HD-STBs. Should I set the default resolution for non-HD broadcasts at 480i or
480p?
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Old 11-16-2006, 06:17 AM   #2
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Try them both, pick the one you think looks the best. The decision amounts to which device does the best job of de-interlacing, the cable box or your TV.

Since you provided no information about your set up other than the brand of cable box, no one can offer a valid opinion.
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Old 11-16-2006, 01:49 PM   #3
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By nature i is for interlaced and p is not. The p Should look better.
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Old 11-17-2006, 03:33 PM   #4
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You're missing the point. His TV is progressive, or "p," by definition. The point is that he has to decide whether the cable box or his TV does the better job of deinterlacing.

On my system the TV clearly does a job better than the cable box, so my cable box is set to 480i and the TV converts it to 480p. When I set the cable box to 480p the TV image looks worse.

All flat panel displays are natively progressive.
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Old 11-17-2006, 08:43 PM   #5
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I'm not missing the point! P is better. Wether it's the box or the HD set. P is better! Maybe your feed is bad!

And not all FP's are natively P! It depends on the chip set and the default settings!
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Old 11-17-2006, 09:57 PM   #6
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Quote:
And not all FP's are natively P! It depends on the chip set and the default settings!
Well, if you believe that, name one. Give us an example of a flat panel Plasma or LCD that is not inherently progressive. Be specific, give the make and model number.
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Old 11-18-2006, 03:38 PM   #7
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Do a google search on "flat panel displays 480i". All of them on the first page support it! All also support p.

You said inherently, I said natively. Maybe the wrong word for what I was trying to convey. My own Sony was set to i and I set it to p and the pic was superior!

Maybe his was set to i from the factory.

As an HP tech I have had to set many FP's to 480p from their native factory settings of i.

I'm trying to help the guy, not get into an online battle!

And I said p SHOULD look better.

So let it go! And don't drink so much before you come here and post.

Your ignorance is showing.
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Old 11-18-2006, 06:23 PM   #8
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Quote:
Originally Posted by Lanny
Try them both, pick the one you think looks the best. The decision amounts to which device does the best job of de-interlacing, the cable box or your TV.

Since you provided no information about your set up other than the brand of cable box, no one can offer a valid opinion.
Sorry. I have a Panasonic 42PX60U Plasma. I can set my cable box's SD default to either 480i or 480p. I thought some of you guys might have already gone through this exercise and could therefore give me the benefit of your experience.
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Old 11-18-2006, 10:24 PM   #9
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Quote:
So let it go! And don't drink so much before you come here and post.

Your ignorance is showing.
You're the one that's ignorant.

Everyone knows that all flat panel TVs are inherently or natively progressive.

The advice given to DGP123 was to try both settings. Either his TV or his cable box will accept the 480i signal and convert it to his TV's native resolution (progressive.) He should then use the setting that gives him the best results.

Results will vary. But for the record, it's been my experience that most flat panel TVs generally do a better job of de-interlacing 480i signals than cable boxes. Maybe your experiences are the exception.

Let DGP123 decide for himself.

As for you, I'm glad I don't need any tech help from HP.

Last edited by Lanny; 11-18-2006 at 10:33 PM.
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Old 11-19-2006, 01:44 AM   #10
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Yeah Lanny is the one with his head on straight. No surprise the person calling someone ignorant is the one misunderstanding the technology.

In my case, my Panasonic plasma is better at both de-interlacing and scaling than my Motorola HD DVR from Comcast.
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Old 11-19-2006, 02:15 AM   #11
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Quote:
Originally Posted by greatscott
Do a google search on "flat panel displays 480i". All of them on the first page support it! All also support p.

My own Sony was set to i and I set it to p and the pic was superior!
You were asked to name one flat panel model that is native "i"; i.e. displays a picture using an interlaced scan procedure. You evaded the issue even though you claim to own one. Supporting interlaced input only means that the set accepts it as an input and says absolutely nothing about how the picture is displayed.

Speciify the exact model number of your Sony and then explain how you set its display from "i" to "p". Your credibility is at stake.
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Old 11-21-2006, 02:56 AM   #12
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Your plasma upscales the picture to 768p. Normally you want only one device do all the scaling / deinterlacing which means output 480i and let the set do all the processing. Maybe the set sux at doing the deinterlacing or not. Try them both and see which one you think looks better. My 1080p DLP set has to (very annoyingly) resych if I send it different input resolutions so I just force my STB to output 720p/1080i to keep my sanity.

If you force the STB to output 480p then the STB is deinterlacing the picture from 480i to 480p then your set is upscaling the picture to 768p.

Quote:
Originally Posted by DGP123
Time Warner is my cable provider. I have Scientific Atlantic HD-STBs. Should I set the default resolution for non-HD broadcasts at 480i or
480p?

Last edited by Battle; 11-21-2006 at 03:07 AM.
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Old 11-22-2006, 03:36 AM   #13
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The Hitachi 42HDF52 is "i".

"Key Features
1080i High-Definition Display"

Here's a link to there specs.
http://www.hitachi.us/tv/browse/plasma/pdf/42HDF52.pdf

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Old 11-22-2006, 12:09 PM   #14
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That's a marketing term, not a real technical specification. The most basic info is the panels native resolution (which they don't give). It's fixed pixel, so it's converted to it's native resolution and de interlaced.

However, it seems to me that the marketing term "1080p" may very well consistently mean a 1920 x 1080 resolution. Yet, it's still possible that it means the set accepts a 1080p signal, then converts it to the panels native resolution which may NOT be 1920 x 1080.

Plasmas are even worse, they seem to be the king of non-square pixels, thus odd resolutions. Seems an awful lot of them do 1024 x 768 native and call themselves HD... uh, that resolution is NOT HD.
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Old 11-22-2006, 05:08 PM   #15
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Quote:
The Hitachi 42HDF52 is "i".

"Key Features
1080i High-Definition Display"

Here's a link to there specs.
Reading the specs you provided, it's native resolution is 1024x1024. This makes it some kind of 1024p TV with rectangular pixels. It converts 1080i to its nonstandard 1024p format. No 42" plasma meets the true standards of HDTV, minimum 1280x720. Neither 1024x1024 or 1024x768 native resolutions correspond to a 16:9 ratio or have enough horizontal pixels, 1280.
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