Method and apparatus for controlling access to selected...

Details Method and apparatus for controlling access to selected... Method and apparatus for controlling access to selected...

H - Electricity

04

N

350/26

H04N 7/167 (2006.01) H04N 7/169 (2006.01)

Patent

CA 1208762

-10- ABSTRACT: In order to control subscriber access to selected television programmes in a CATV system, non-standard hori- zontal synchronizing pulses are generated (13, 15, 17) having a greater amplitude and either higher or lower pulse repetition rate than the contained horizontal synchro- nizing pulses. These are selectively added (19 ... 23, 27 ... 33) to those television programmes to be controlled. As a result, the television receiver of a nonpaying sub- scriber interprets the non-standard pulses as being valid horizontal synchronizing pulses thereby preventing the receiver from synchronizing its line scanning with that of the television programme, rendering picture produced therefrom unviewable.

444063

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