Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-05-19
1979-07-17
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 84, 358122, H04N 716
Patent
active
041617517
ABSTRACT:
A poach-resistant system enabling cable television subscribers to receive upon request certain programs otherwise unavailable (i.e., "secure") while precluding such reception by non-requesting subscribers as well as non-subscribers. Before transmission of such a secure program the roster of subscribers is scanned at a central control station having compiled subscribers' requests for that program, and a resulting string of pulses corresponding in sequence to the respective subscribers is punctuated with program command pulses timed to designate those subscribers who have requested the program. Transmission of the resultant program command signal string over the cable to junctions with leads to the respective subscribers' television sets results in unblocking of such junction for each of the requesting subscribers only.
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patent: 3968327 (1976-07-01), Gregg
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Buczinski S. C.
McClure Charles A.
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