Jamming signal generating circuit

Details Jamming signal generating circuit Jamming signal generating circuit

1985-10-15

1987-03-17

Buczinski, Stephen C.

Cryptography

Cryptanalysis

455 1, 380 20, H04K 102, H04K 100, H04K 300, H04N 7167

Patent

active

046512047

ABSTRACT:
A jamming circuit for a CATV system in which the jamming signal is offset in frequency by a voltage controlled oscillator and then mixed with the unjammed television signal. A difference component is obtained from the mixer and is attenuated to a fixed level. This signal is then 100%-AM-modulated by a low frequency signal. The AM-modulated signal is mixed with an output from the voltage controlled oscillator and the double side bands are superimposed on the television line feeding the terminal of the subscriber.

REFERENCES:
patent: 4148064 (1979-04-01), Reed
patent: 4342119 (1982-07-01), Seidl

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