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Indeed ...the 625 line / 50 field standard is used in most PAL and SECAM countries which means that at least the monochrome standards are compatible ...the difference is in the colour system ...with SECAM, I understand, the colour information is sent line by line with a delay line built into the receiver so that the colour information is never simultaneouly present in the signal.
The main problem seems to be to identify what is a red or blue line in the signal and this is done in a number of different ways depending on the version of SECAM employed.
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........RGBRGBRGB ...colour my world
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