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Nec 42vp4 Problem
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joffa99
Newbie
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17. May 2005 @ 03:44 |
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I've had this display for just under a year now and lately I've noticed that a fair bit of shows I watch are suffering from what I can only describe as clay-face. People look like they are made of clay, especially if they aren't in focus. Up until now this tv has looked fine and I have done nothing that I know of to change a setting or anything. Does anyone know what this problem could be? You guys seem to know a fiar bit (been lurking for some time). Any help would be greatly appreciated.
Nick
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AfterDawn Addict
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17. May 2005 @ 08:16 |
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Your problem is the signal your are sending to the NEC. Since it is a 42" TV it is obviously much larger than a standard CRT screen of say 32". This being the case, you will need to upscale the image you are putting on to the screen. If the signal is a standard cable connection, ie: if you are in the USA, or an analogue aerial input, then it is likely to be an interlaced image with around 500 lines of data.
What you need to do is get yourself either an upscaler or a de-interlacer/Progressive Scanning unit, that will convert your interlaced image into a Progressive scanning image. This will effectly double the amount of information on the screen. You see, a Progressive Scan image shows each line in sequence, ie: it goes 1,2,3,4,5....,right up to its maximum. An interlaced image at a standard 1/30th of a second display, will show lines 1,3,5,7,9....etc and then in the 2nd 30th of a second, it will display lines 2,4,6,8,10....etc, and then in 3rd 30th of a second, it will be back to 1,3,5,7,9....etc. AS you may have calculated by now, a Progressive scan image basically will refresh in 1/30th of a second, where as an interlaced image will completely refresh in 1/15th of second.
I know, its a crude way of looking at it but it does explain why a Progressive Scan image effectively doubles the quality.
If you are producing a Progressive Scan image and or and upscaler, then im afraid all of what i wrote above doesnt apply to you.
Chris
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joffa99
Newbie
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18. May 2005 @ 00:33 |
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Thanks for the reply. When you say I need an upscaler do you mean a new TV or is it something that I feed my set top box(Australian cable provider box) into? If it's the latter how much are these usually and where can I get these? Thanks for your help
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Advertisement
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AfterDawn Addict
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18. May 2005 @ 02:33 |
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Yeah, its an addition to the TV. They come as units, im not sure about the US, if thats where you are from, but in the UK, something like this is required, though note that this is an expensive model, and they start at a good bit less for more basic ones:
http://www.av-sales.com/html/iscan_ultra.html
Hope this helps, anymore questions, feel free to ask
Chris
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