Cryptography – Cryptanalysis
Patent
1988-08-01
1990-03-27
McElheny, Jr, Donald
Cryptography
Cryptanalysis
358335, 360 371, 380 15, H04N 576, H04N 593
Patent
active
049126911
ABSTRACT:
This invention is directed at a video stabilizer which removes non standard AGC pulses added to a video signal for inhibiting the making of acceptable video recordings of the video signal which includes filtering out the horizontal synchronizing signals form the composite synchronization signal, while passing the vertical synchronizing signal; differentiating the vertical synchronizing signals; applying the differentiated signal to a first electronic device; turning the first electronic device off at the end of the vertical synchronizing signal and charging the first capacitor providing a first ramp voltage; applying the first ramp voltage to a first pair of comparator amplifiers; applying the output signal of the first pair of comparator amplifiers to a first amplifier shunting a poriton of the output signal through a first diode array and the remaining portion of the output signal to charging a second capacitor providing a second ramp voltage; the second ramp voltage being applied to a second amplifier; the output of the second amplifier being applied to a second diode array; and then clamping the output of a second electronic device to 0.4 of a volt.
REFERENCES:
patent: 3517127 (1970-06-01), Grace
patent: 4382098 (1989-04-01), Smeulers
patent: 4631603 (1986-12-01), Ryan
patent: 4695901 (1987-09-01), Ryan
patent: 4789896 (1988-12-01), Kishi et al.
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