Off-premises cable television channel interdiction method...

Details Off-premises cable television channel interdiction method... Off-premises cable television channel interdiction method...

H - Electricity

04

N

350/20

H04N 7/167 (2006.01) H04N 7/16 (2006.01)

Patent

CA 1334444

Off premises cable television interdiction apparatus comprises a microprocessor actuation and control means for actuating and con- trolling a plurality of frequency agile voltage controlled oscillators. The voltage controlled oscillators selectively jam only unauthorized premium programming transmitted in the clear from a headend to a particular subscriber. Each voltage controlled oscillator is allocated a continuous band of frequencies consistent with the elimination of jamming signal frequency harmonics which may disturb authorized programming at a higher channel frequency. The microprocessor actuation and control means 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 oscillators consistent with a head end selected jamming factor for a particular channel to be jammed and addressably transmitted and stored premium program- ming authorization data.

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