Dalvi decoder

Does anyone how to create a dalvi decoder? Pls if you have any datasheet any circuit diagram, blocks.
Spectrum inversion is just for audio scrambling.
for video they cut each line in 2 parts. the cuting point can be done in 256 positions on a line. After the cut the lines are rotated (the first part becomes the second part). the system is pseudo digital because they convert the chanels (HBO, DISCOVERY TRAVEL....) from analog to digital make the coding and convert back to analog. It is something like Videocypt systems. if you have something for videocrypt decoding it might help me.


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