초록 ▼

Off premises cable television interdiction apparatus comprises a microprocessor actuation and control means for actuating and controlling a plurality of frequency agile voltage controlled oscillators. The voltage controlled oscillators selectively jam only unauthorized premium programming transmitte

Off premises cable television interdiction apparatus comprises a microprocessor actuation and control means for actuating and controlling 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 programming authorization data.

대표청구항 ▼

Cable television premium channel interdiction apparatus for selectively jamming unauthorized premium programming transmitted to a subscriber comprising: a plurality of m controlled oscillators, each said oscillator separately interdicting within a continuous portion of a broadband cable television s

Cable television premium channel interdiction apparatus for selectively jamming unauthorized premium programming transmitted to a subscriber comprising: a plurality of m controlled oscillators, each said oscillator separately interdicting within a continuous portion of a broadband cable television spectrum, the sum of said continuous portions comprising a total spectrum to be jammed, a plurality of filters, each said filter associated with each said oscillator, each said continuous portion selected from the cable television spectrum such that jamming signal frequency harmonic interference is alleviated by each said filter, and microprocessor actuation and control means for selectively actuating and controlling a plurality of n jamming frequencies provided by the plurality of m controlled oscillators, m being less than or equal to n.