Television – Two-way video and voice communication – User positioning
Patent
1994-03-07
1996-08-27
Kostak, Victor R.
Television
Two-way video and voice communication
User positioning
348 13, H04N 714
Patent
active
055505791
ABSTRACT:
A bidirectional cable television system provides for transmission of signals from cable subscribers downlink in the same direction as the ensemble of television channels which the cable television system is already constructed to deliver. The subscriber signals may be transmitted over the cable in the blanking intervals of a cable television channel, using the T-NET technique described in U.S. Pat. No. 4,750,036. Alternatively, the signals may be carried over a dedicated channel, or transmitted cochannel along a cable television channel carrying ordinary programming by adding the subscriber information to alternating video frames in alternating polarity to achieve visual cancellation. The subscriber signals are collected after the last distribution line amplifier in the cable downlink. The collected signals are transmitted to a central receiver via wireless or other customary means such as a modem. The collected signals may alternatively be transmitted over the air to the central receiver in the blanking intervals of a broadcast television channel using the T-NET technique.
REFERENCES:
patent: 3924060 (1975-12-01), Bedford
patent: 4959862 (1990-09-01), Davidov
patent: 5010399 (1991-04-01), Goodman et al.
patent: 5243423 (1993-09-01), Dejean et al.
Kostak Victor R.
Radio Telecom & Technology, Inc.
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