Method and an apparatus for preventing unauthorized recording on

Details Method and an apparatus for preventing unauthorized recording on Method and an apparatus for preventing unauthorized recording on

1995-01-26

1997-09-30

Truong, Khoi D.

Motion video signal processing for recording or reproducing

Local trick play processing

With randomly accessible medium

380 10, 380 15, 380 12, H04N 576, H04N 7167

Patent

active

056733569

ABSTRACT:
A method and apparatus are provided for preventing unauthorized recording of video programs 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 that, on the other hand, the cooperation between the driving means for the tape and the recording head displacement in the tape recording apparatus will be disturbed. The apparatus comprises an input stage (4) for digitalizing the video signals, a shift memory (5), an output stage (8) for converting the video signals to be used into analog form, an input control stage (6) for the memory (5) and an output control stage (7) for the memory (5). The control frequency of the input control stage (6) is adapted to the frame repetition frequency of the digitalized video signals to be stored in the memory (5). The control frequency of the output control stage (7) is different from the control frequency of the input control stage (6), and the capacity of the memory (5) is sufficient to compensate the differences between the signal input and output.

REFERENCES:
patent: 4631603 (1986-12-01), Ryan
patent: 4673981 (1987-06-01), Lippman et al.
patent: 4819098 (1989-04-01), Ryan
patent: 4907093 (1990-03-01), Ryan
patent: 5130810 (1992-07-01), Ryan
patent: 5187589 (1993-02-01), Kono et al.

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