Data encryption technique for subscription television system
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United States of America Patent
Stats
-
Apr 30, 1985
Grant Date -
N/A
app pub date -
Aug 23, 1982
filing date -
Aug 23, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A subscription television system includes a head-end for transmitting selected fields of a television signal in a scrambled form, the scrambled fields being identified by an encrypted mode control code inserted in a selected horizontal line of the preceding vertical interval. The mode control code is formed such that a predetermined non-transmitted control code is realized when the mode control code is processed with vertical interval system control data according to a selected function. A decoder processes the received mode control code and system control data according to the selected function to reconstitute the predetermined control code for enabling unscrambling of the following field. The decoder may employ majority voting techniques whereby not all of the bits of the reconstituted control code need be properly recovered to enable the unscrambling function.
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Family
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Cited Art Landscape
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