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Why is digital old 4:3 fullscreen narrower than analog 4:# fullscreen on TV broadcast

post #1 of 6
1/13/08 at 11:10pm
Thread Starter 
I don't understand, there is about an inch and a half difference on either side for a total of three inches larger for old analog signals. I do not see any distortion and I do not notice any slight bars on the top an bottom. Is the digital squeezing or is the analog stretching or perhaps oversize? I remember my old TV, you could see more image was slightly available beneath the plastic. Is his more viewable in digital making it smaller in the process?
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post #2 of 6
1/13/08 at 11:25pm

Re: Why is digital old 4:3 fullscreen narrower than analog 4:# fullscreen on TV broadcast

It's more like getting rid of overscan. Overscan is what you were describing when you can see there's more image to be had. Television manufacturers used to decide how much overscan you have to live with. Now it can be adjusted or eliminated all together. I would say the digital version is giving you the entire 4:3 image. That may also have a slight size difference between the two. However, in respect to OAR, I'd rather have the entire intended image smaller in size vs. overscaning to fill the screen....and then some.
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post #3 of 6
1/14/08 at 6:56am
Thread Starter 

Re: Why is digital old 4:3 fullscreen narrower than analog 4:# fullscreen on TV broad

Me too, I was just wondering why and I guess I was kind of figuring it out as I was typing but wanted to be certain.

This gets me to another issue now. I have both US and UK versions of one show on DVD, Carry On Laughing, I posted pics in another thread about my Olevia TV, and I have noticed that the PAL DVD is narrower than the NTSC one. I need to look at them again but I think the NTSC version was as wide as analog TV but the PAL was narrower than digital, So I guess they must have more overscan and when they are converted to NTSC for US release this overscan is cropped off.
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post #4 of 6
1/17/08 at 1:14pm

Re: Why is digital old 4:3 fullscreen narrower than analog 4:# fullscreen on TV broadcast

With a PAL DVD, you may also need to adjust the PAL-to-NTSC conversion for proper OAR display, assuming that's what you're doing. That's why some folks try to shop for a DVD player that can do the conversion correctly (vs just doing any old conversion) or at least allow you to manually adjust it.

_Man_
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post #5 of 6
1/20/08 at 8:58am

Re: Why is digital old 4:3 fullscreen narrower than analog 4:# fullscreen on TV broadcast

Which are you referring to?

1. A digital broadcast compared with an analog broadcast seen on the same TV,

2. The same broadcast shown on a digital TV compared with on an analog TV.

It is possible for digital broadcasts to be processed differently by the tuner resulting in slightly wider or narrower pictures compared with analog broacasts on the same TV. Vertically the picture sizes of digital and analog broadcasts should be the same on the same TV.
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post #6 of 6
1/23/08 at 2:24pm

Re: Why is digital old 4:3 fullscreen narrower than analog 4:# fullscreen on TV broadcast

Normal PAL has an aspect ratio of 5:4, not 4:3 like NTSC in the US. Different chips make different decisions about how to deal with this.
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