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Back when I was working on a video tester, our goal was to support all standards. Yes, the SECAM standard is pretty strange. Few people know this, but the derivation of the SECAM name came from: Specifically Engineered Contrary to the American Method. In the end, there wasn't enough of a market of SECAM chips to warrent us making our tester compatible with SECAM.
The main thing about SECAM is that not enough information is supplied on each line for full color information. As I recall, the color information alternated per line. For example, one line has the green-red info, followed by green-blue, followed by green-red again, and so on. Now that I read that explanation, I think my memory from a project nearly 20 years ago is faulty.
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