Cryptography – Key management – Having particular key generator
Patent
1988-04-28
1990-09-25
Buczinski, Stephen C.
Cryptography
Key management
Having particular key generator
455 6, 358 86, H04N 7167
Patent
active
049598627
ABSTRACT:
An active multichannel video processing hub which provides optinum transition from fiber to coaxial cable, provides optimum trading of bandwidth for signal to noise ratio. Fiber optic links have a very large bandwidth capability. Larger distances can be covered with fiber optic links without repeaters. This offers not only saving in maintenance, but has no radiation and offers bidirectional capabilities not easily achievable with coax-based trunks. Scrambled signals are transmitted over the fiber and converted to VSB-AM signals at the hub for transmission over the coaxial portion of the trunk. This keeps the bulky and complex headend scrambling equipment in one central location instead of spreading it over many hub locations. The inherent heterodyne processing capabilities of the hub permit it to link headends with different frequency plans. Also, the hub-based trunk does not obsolete existing equipment and method of operation.
REFERENCES:
patent: 2506672 (1950-05-01), Kell et al.
patent: 4779129 (1988-10-01), Uee et al.
W. Horak, "TV Program Distribution Over Fiber CATV Networks"; Proceedings of Int. Broadcasting Convention, (London, 9/76), pp. 228-231.
B. White, "The Fibre Optic Pipedream Comes True in Video"; "Broadcasting Systems & Operation"; (8/79, pp. 352-356).
Davidov Mircho A.
Singh Kamaljit
Buczinski Stephen C.
Catel Telecommunications, Inc.
Gregory Bernarr Earl
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