Method of scrambling television pictures and arrangement for descrambling the pictures thus scrambled
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United States of America Patent
Stats
-
May 24, 1988
Grant Date -
N/A
app pub date -
Aug 29, 1983
filing date -
Sep 14, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method of scrambling television pictures for which the video signals of each scanning line are of the M.A.C. type, that is to say time-division multiplexing of the analog chrominance and luminance components, characterized in that on transmission the components are each divided, in each line, one after the other, into two consecutive signals C and D, on the one hand, and F and G, on the other hand, the first signal C and F of which are then delayed for the duration of the second signal, and the second signals D and G are advanced for the duration of the first signals, the reference periods B and E which precede these respective components being excluded from this processing operation, the positions of the dividing points being derived from pseudo-random digital sequences, and the processing operation being intended to be applied on reception in the opposite sense for the simultaneous recovery of the luminance signal Y and the color difference signals U and V.
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Cited Art Landscape
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