Hybrid CATV scrambling system

Cryptography – Cryptanalysis

Patent

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Details

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.

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patent: 4642688 (1987-02-01), Lowry
patent: 4673976 (1987-06-01), Wreford-Howard
patent: 4688248 (1987-08-01), Tomizawa

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