Scrambling and descrambling of television signals for...

Details Scrambling and descrambling of television signals for... Scrambling and descrambling of television signals for...

H - Electricity

04

N

350/20

H04N 7/167 (2006.01) H04N 7/171 (2006.01)

Patent

CA 1186793

SCRAMBLING AND DESCRAMBLING OF TELEVISION SIGNALS FOR SUBSCRIPTION TV ABSTRACT Subscription TV premium programming may be encoded with tagging information as by transmitting a tagging pulse during at least one horizontal line interval of each picture field in addition to pulses which are used to time the restoration of horizontal sync in the descrambler of a sync suppressed scrambling system. The additional tagging pulses provide informa- tion necessary to enable or disable the descrambler, and thereby provide high level encoding with minimum hard- ware complexity.

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