Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-07-19
1986-03-18
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 84, 358117, 358122, H04N 716, H04N 7167
Patent
active
045772240
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 complied 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. Allocation of plural clocking pulses to each subscriber enables program availability to be tiered as desired. Appropriate circuitry in the junction of each subscriber's lead with the transmitting cable retains control there so that unauthorized program signals never enter a subscriber's premises, where security could be defeated.
REFERENCES:
patent: 4024574 (1977-05-01), Nieson
patent: 4068264 (1978-01-01), Pires
patent: 4091417 (1978-05-01), Nieson
patent: 4225884 (1980-09-01), Block et al.
patent: 4268859 (1981-05-01), Ost
patent: 4369462 (1983-01-01), Tomizawa et al.
Buczinski S. C.
McClure Charles A.
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