Jamming signal producing system in CATV

Details Jamming signal producing system in CATV Jamming signal producing system in CATV

1991-11-06

1993-07-13

Cain, David

Cryptography

Cryptanalysis

380 20, H04N 7167

Patent

active

052280829

ABSTRACT:
A system for producing a jamming signal to be inserted in a band of CATV has a voltage producing circuit for producing a control voltage corresponding to the band, and a first voltage-controlled oscillator for producing a first jamming signal having a frequency dependent on the control voltage, and capacitors for storing the control voltage. A second jamming signal is produced by a second jamming signal producing circuit from the charged stored control voltage. A CPU is provided for controlling the production of the first and second jamming signals.

REFERENCES:
patent: 4434436 (1984-02-01), Kleykamp et al.
patent: 4651204 (1987-03-01), Uemura

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