Cryptography – Key management – Having particular key generator
Patent
1991-06-13
1994-06-07
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
380 20, H04N 7167
Patent
active
053197097
ABSTRACT:
A television system having sync suppression scrambling and descrambling which includes in band and out of band signaling methods. The in band signaling method modulates the IF sound carrier of a premium video channel with timing and data pulses while the out of band signaling method modulates the previously modulated IF sound on a separate carrier onto a separate out of band data carrier. The in band signaling method uses a descrambler which tunes a channel before demodulating the timing and data pulses from the sound carrier while the out of band signaling method tunes a selected data carrier to demodulate the timing and data pulses. In both methods, the timing pulses are used to restore the levels of the synchronization pulses in the sync suppressed video signal, and thus descramble the signal, while the data pulses are used for addressable messaging to the descrambler including authorization. The out of band descrambler provides broadband sync restoration for a particular channel and thus does not need a broadband tuner for the video signal.
REFERENCES:
patent: 3530232 (1970-09-01), Reiter et al.
patent: 3789131 (1974-01-01), Harney
patent: 4450481 (1984-05-01), Dickinson
patent: 4466017 (1984-08-01), Banker
patent: 4471380 (1984-09-01), Mobley
patent: 4790010 (1988-06-01), Sgrignoli
patent: 4920566 (1990-04-01), Robbins et al.
patent: 4922532 (1990-05-01), Farmer et al.
patent: 5029340 (1991-07-01), Hashimoto
patent: 5113441 (1992-05-01), Harada
Operational Characteristics of Modern Set-Top Terminals, Jun. 4, 1984 J. O. Farmer.
General Instrument, Jerrold Starpack Pay Tv Security System, F1-F2, Jan. 1980.
General Instrument, Jerrold Starpack Multi-Level Pay Security System-300 MHz, F3-F4, Jan. 1980.
Bacon Kinney C.
Bagley Julius B.
Cook, Jr. Alex M.
Farmer James O.
Harney Michael P.
Buczinski Stephen C.
Scientific-Atlanta, Inc.
LandOfFree
System for broadband descrambling of sync suppressed television does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for broadband descrambling of sync suppressed television , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for broadband descrambling of sync suppressed television will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-799805