Cryptography – Key management – Having particular key generator
Patent
1985-02-25
1987-09-01
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 10, H04N 7167
Patent
active
046913530
ABSTRACT:
In a TV signal scrambling system for use in a CATV network wherein premium programs are transmitted over cable, by broadcast transmission and the like with the sync pulses of the color TV signals suppressed, a processor is provided which processes the color components separately from the luminance and sync components so as to remove coherency (constant phase relationship) between the color subcarrier and the sync pulses. The separately processed components with the coherency removed are recombined to provide the composite TV signal which is scrambled and transmitted to the subscribers. Subscribers having television receivers of the type which recover sync signals by count down techniques from the color subcarrier, such as those using some integrated circuits (chip sets) are then made unable to recover the sync pulses unless equipped with an authorized descrambler. Unauthorized subscribers who are equipped with digital television receivers therefore obtain a scrambled TV picture which rolls horizontally across the screen.
REFERENCES:
patent: 2857455 (1958-10-01), Jolliffe
patent: 3081376 (1963-03-01), Loughlin et al.
patent: 3103550 (1963-09-01), Ellett
patent: 3333052 (1963-10-01), Kahn
patent: 4338628 (1982-07-01), Payne et al.
Buczinski Stephen C.
Koltak Melissa L.
Lukacher Martin
Scientific - Atlanta, Inc.
LandOfFree
Scrambling systems for CATV does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scrambling systems for CATV, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scrambling systems for CATV will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1268936