G - Physics – 11 – B
Patent
G - Physics
11
B
352/18
G11B 27/10 (2006.01) H04N 5/913 (2006.01) H04N 9/896 (2006.01)
Patent
CA 2000423
Abstract A method and an apparatus for preventing unauthorised recording on tapes of video programmes. A method and an apparatus for preventing unauthorised recording of video programmes on tape, in which, the frame repetition frequency of the signals to be transmitted is changed in such a manner, that, on the one hand, the operation of a television apparatus used for reproducing said signals will not be disturbed, but, on the other hand, the co-operation between the driving means for the tape and recording head displacement in the tape recording apparatus will be disturbed. The apparatus comprises an input stage (4) for digitalising the video signals, a shift memory (5), an output stage (8) for bringing the video signals to be used in the analog form, an input control stage (6) for said memory (5), the control frequency thereof being adapted to the frame repetition frequency of the digitalised video signals to be stored in said memory (5), and an output control stage (7) for said memory (5), the control frequency thereof being different from the control frequency of the input control stage (6), the capacity of said memory (5) being suffi- cient for compensating the differences between the signal input and output.
Copyguard Enterprises S.a.
Kent & Edgar
Wijnen Arie Marinus
LandOfFree
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