Cryptography – Key management – Having particular key generator
Patent
1991-07-19
1992-11-03
Cangialosi, Salvatore
Cryptography
Key management
Having particular key generator
380 11, 380 14, H04N 7167
Patent
active
051611880
ABSTRACT:
A system for scrambling and descrambling the image associated with a video signal employs the shifting in time of a video image after removal of vertical and horizontal synchronization, and color burst reference signals. Coded data which contains information necessary for unscrambling the video image is transmitted in the video signal itself during the vertical blanking interval. A high level of simplification in the decoding is achieved by merely restoring synchronization and color reference data without the need for returning the video image to its original timing. This system provides the significant advantage of permitting unscrambling by unlocking vertical and horizontal synchronization of the video image using inexpensive circuitry at the decoder end, while affording the operator of the transmitter the ability to select whether the unscrambled signal is recordable by a conventional video tape recorder at the receiving end.
REFERENCES:
patent: 4901349 (1990-02-01), Metzger et al.
patent: 4916736 (1990-04-01), Ryan
patent: 5003592 (1991-03-01), Pires
patent: 5034981 (1991-07-01), Leonard et al.
patent: 5058157 (1991-10-01), Ryan
patent: 5060262 (1991-10-01), Beuins, Jr. et al.
LandOfFree
Scrambling video by horizontal and vertical time shifting 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 video by horizontal and vertical time shifting, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scrambling video by horizontal and vertical time shifting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2056341