Cryptography – Cryptanalysis
Patent
1986-10-17
1989-06-06
Buczinski, Stephen C.
Cryptography
Cryptanalysis
358 86, 380 20, 455 1, 455 4, H04N 7167, H04N 710, H04K 300
Patent
active
048378208
ABSTRACT:
A CATV scrambling system ultilizes low cost, uncritical, pole mounted components for all subscriber locations and high cost precision components only in subscriber units provided at "premium" subscriber locations. The subscriber unit includes a digital stepped oscillator for generating frequencies that are 1/10 of the frequency of the premium television signals and are supplied, along with data, to a pole unit scrambling station. The pole unit has a microprocessor which interprets the data and opens a switch for premium television signals that are to be received. The digital stepped oscillator output is supplied to a frequency multiplier which produces interfering carrier frequency signals that are injected through a directional coupler into the cable that feeds the subscriber TV/VCR. A broad band default oscillator is activated by a microprocessor in the pole unit when there is no subscriber unit or when the data is not present.
REFERENCES:
patent: Re29997 (1979-05-01), der Toonder
patent: 3736369 (1973-05-01), Vogelman
patent: 3914534 (1975-10-01), Forbes
patent: 4367557 (1983-01-01), Stern et al.
patent: 4434436 (1984-02-01), Kleykamp et al.
patent: 4577224 (1986-03-01), Ost
patent: 4642688 (1987-02-01), Lowry
patent: 4673976 (1987-06-01), Wreford-Howard
patent: 4688248 (1987-08-01), Tomizawa
Buczinski Stephen C.
Wallace Linda J.
Zenith Electronics Corporation
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