Data encryption technique for subscription television system

Details Data encryption technique for subscription television system Data encryption technique for subscription television system

1982-08-23

1985-04-30

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358117, 358123, 358124, H04N 716, H04K 104

Patent

active

045147612

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.

REFERENCES:
patent: 3746799 (1973-07-01), Gentges
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patent: 4222068 (1980-09-01), Thompson
patent: 4292650 (1981-09-01), Hendrickson
patent: 4388643 (1983-06-01), Aminetzah
patent: 4460922 (1984-07-01), Ensinger et al.

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