Telecommunications – Interference signal transmission
Patent
1990-02-21
1994-02-15
Eisenzopf, Reinhard J.
Telecommunications
Interference signal transmission
455 62, 455 261, 380 10, 380 19, 348 6, H04K 300
Patent
active
052875393
ABSTRACT:
Off premises cable television interdiction apparatus comprises a microprocessor actuation and control means for actuating and controlling at least one frequency agile voltage controlled oscillator. The voltage controlled oscillator selectively jams only unauthorized premium programming transmitted in the clear from a headend to a particular subscriber. The voltage controlled oscillator generates a jamming signal carrier at a frequency 1/N between the video and audio carriers where N is an integer, preferably small. The microprocessor provides a calibration mode and a normal mode of operation. During the normal mode of operation, a frequency hopping rate on the order of four thousand hertz is achievable. the method of interdiction comprises the steps of generating and storing voltage control words for operating the oscillator consistent with a headend selected jamming factor for a particular channel to be jammed and addressably transmitted and stored premium programming authorization data.
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Eisenzopf Reinhard J.
Faile Andrew
Marvin William A.
Powers, III Frederick W.
Scientific-Atlanta, Inc.
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