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Originally Posted by Proppinupthebar
Theres only two standards as far as I'm concerned and then something the french did just to annoy people!
Negative video modulation is done because humans are more perceptive to noise on a dark scene than they are to noise on a light scene. A dark scene with negative modulation has a higher signal amplitude and so noise has a lessened impact. Hope that makes sense, I haven't described it very well!
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Yep...I understand the reasons for negative video modulation, but the point I was trying to make is that even "standards" can be incompatable.
The PAL "standard" has different variants. A typical British TV would not work properly in (say) Germany, even though both countries use the PAL system, since the UK uses PAL I and Germany uses PAL B,G.
I think even NTSC & SECAM have variants too, although not as many as PAL.
As for the French, I believe they insisted on being different to try & protect their domestic TV manufacturing industries. I wonder if it worked?