METHOD AND APPARATUS FOR CONTROLLING ACCESS TO SELECTED TELEVISION PROGRAMS

METHOD AND APPARATUS FOR CONTROLLING ACCESS TO SELECTED TELEVISION PROGRAMS

In order to control subscriber access to selected television programmes in a CATV system, non-standard horizontal synchronizing pulses are generated (13, 15, 17) having a greater amplitude and either a higher or lower pulse repetition rate than the contained horizontal synchronizing pulses. These ar...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: BINGHAM, JOSEPH P, HATCH, DOUGLAS J
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:In order to control subscriber access to selected television programmes in a CATV system, non-standard horizontal synchronizing pulses are generated (13, 15, 17) having a greater amplitude and either a higher or lower pulse repetition rate than the contained horizontal synchronizing pulses. These are selectively added (19 ... 23, 27 ... 33) to those television programmes to be controlled. As a result, the television receiver of a nonpaying subscriber interprets the non-standard pulses as being valid horizontal synchronizing pulses thereby preventing the receiver from synchronizing its line scanning with that of the television programme, rendering the picture produced therefrom unviewable.