3886302 is referenced by 181 patents and cites 4 patents.

A system for controlling CATV program viewing in a plurality of modes of operation. In a first mode of operation, a downstream digital transmission causes control means to develop first binary data for comparison in a comparator with selected-channel code data from channel means to enable a first circuit to allow a first or second category program to be selected and received by a subscriber during a predetermined temporary period of time. In a second mode of operation the enabling of a second circuit by the subscriber will only cause the control means to be enabled if the subscriber is authorized to receive that selected first category program. In a third mode of operation the enabling of the second circuit by the subscriber will enable a third circuit to allow a selected second category program to be received. In a fourth mode of operation the selection of a third category program by the subscriber will enable a fourth circuit to allow that selected third category program to be received. MODEM sharing networks are provided in the cable system interconnecting a local processing center and the various subscriber terminals. Each MODEM sharing network has modulation and demodulation circuitry, and ability to handle about twelve subscriber terminals.

Title
Closed circuit television modem sharing system
Application Number
05/437,410
Publication Number
3886302
Application Date
January 28, 1974
Publication Date
May 27, 1975
Inventor
Kosco Thomas J
Agent
Gerry Martin E
MacAllister W H
Assignee
Hughes Aircraft Company
IPC
H04n 01/44
H04N 07/173
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