Method and apparatus for multi-tire time shared CATV jamming

Details Method and apparatus for multi-tire time shared CATV jamming Method and apparatus for multi-tire time shared CATV jamming

1993-08-18

1994-10-11

Cain, David C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 6, 380 7, 380 5, 380 10, H04N 7167

Patent

active

053554108

ABSTRACT:
A method and apparatus, for jamming selected channels, in a CATV system, wherein six different pre-determined frequencies ("fx"), are generated at a head end, on a time divisional basis, which head end also generates a synchrinization signal ("sync. sig.") that identifies which fx is being generated, a multiple of receiver ends, each of which receives, at one input all of the TV channels' signals, the fx, the sync. sig., and a subscriber status signal ("SSS") that identifies the channels, if any, that the subscriber is entitled to receive, wherein the receiver end: (A) divides the received signals into: (I) TV channels' signals, SSS, and sync. sig., and (II) fx; (B) generates a local fixed frequency; (C) mixes the local fixed frequency with the fx, thereby creating a jamming signal; (D) decodes the sync. sig.; (E) decodes the SSS, to obtain the subscriber status information; (F) transmittes the TV channels' signals to the subscriber, if the subscriber status information, indicates that subscriber, is entitled to receive at least some or all of the TV channels; and (G) combines the jamming signal, with the TV signals, going to the subscriber, when the created jamming signal, is for a channel, that subscriber is not entitled to receive.

REFERENCES:
patent: 5142574 (1992-08-01), West
patent: 5228082 (1993-07-01), Yanagidaira et al.
patent: 5233652 (1993-08-01), Huang et al.
patent: 5255318 (1993-10-01), Gurusami et al.
patent: 5278908 (1994-01-01), Parikh et al.

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