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Originally Posted by XFS03
...even more when you consider the PAL variants (pos/neg vision modulation, AM/FM sound modulation, different sound offset frequencies etc.)
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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!