Method and apparatus for controlling access to selected televisi

Details Method and apparatus for controlling access to selected televisi Method and apparatus for controlling access to selected televisi

1982-12-29

1985-06-04

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358118, H04N 716, H04K 102

Patent

active

045218099

ABSTRACT:
In order to control subscriber access to selected television programs in a CATV system, nonstandard horizontal synchronizing pulses, having a greater amplitude and either a higher or lower pulse repetition rate than the contained horizontal synchronizing pulses, are selectively added to those television programs to be controlled. As a result, the television receiver of a nonpaying subscriber interprets the nonstandard pulses as being valid horizontal synchronizing pulses thereby preventing the receiver from synchronizing its line scanning with that of the television program rendering the picture produced therefrom unviewable.

REFERENCES:
patent: Re29997 (1979-05-01), Toonder
patent: 2624797 (1953-01-01), Lawson et al.
patent: 3313880 (1967-04-01), Bass
patent: 3460161 (1969-08-01), Waller et al.
patent: 3485941 (1969-12-01), Bass
patent: 4367557 (1983-01-01), Stern et al.
patent: 4398214 (1983-08-01), Gargini
patent: 4434436 (1984-02-01), Kleykamp et al.

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