H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/27
H04N 7/16 (2006.01)
Patent
CA 2003698
An off-premises cable television interdiction apparatus pro- vides a microprocessor controller for controlling and switching one or more variable frequency voltage controlled oscillators. The variable frequency oscillators selectively jam only unauthorized premium pro- gramming transmitted on particular channels of a broadband signal in the clear from a headend to a subscriber. The microprocessor con- troller controls the variable frequency oscillators to hop between jamming frequencies and jam particular channel under control from the headend. A frequency calibration routine is executed periodically upon power-up to determine gain parameters for the oscillators. A heterodyned variable frequency oscillator may be provided for the interdiction system which moves the frequency of the variable fre- quency oscillator out of the television band and mixes the variable frequency oscillator output with a fixed local oscillator output to pro- vide a jamming signal that falls in the television band. Gain control using a heterodyned oscillator may instead be provided for use in the interdiction system which uses one channel of the broadband signal as the jamming signal. Automatic gain control may also instead be pro- vided for controlling the attenuation of a variable attenuator in accordance with a gain function determined by interpolation and pre- viously stored in memory by a calibration routine executed periodi- cally or upon power-up. The calibration routine may run concurrently with a frequency calibration routine for controlling the frequency of the jamming signal.
Blonder Tongue Investment Company
Sim & Mcburney
LandOfFree
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