CATV receiver

Details CATV receiver CATV receiver

1988-09-02

1989-05-02

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 15, H04N 144, H04R 104

Patent

active

048275093

ABSTRACT:
In a CATV receiver for receiving scrambled television signal, then de-scrambling it to original television signal responsive to key pulses contained in the scrambled television signal, and then outputting it at a predetermined frequency band, said receiver characerized in that an output section of the receiver is provided with a trap circuit for attenuating signals which are at frequency bands adjacent to the predetermined frequency band and that the trap circuit is made operative synchronizing with the key pulses. Even when either of the adjacent channels is selected by the common television set, therefore, the television signal at the adjacent channel cannot be picked up to thereby prevent it from being poachingly viewed on the screen of the television set.

REFERENCES:
patent: 3760097 (1973-09-01), Burroughs et al.
patent: 4148064 (1979-04-01), Reed
patent: 4523228 (1985-06-01), Banker
patent: 4725882 (1988-02-01), Sato et al.

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