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Interactive television and data transmission system

  • US 5,321,514 A
  • Filed: 09/04/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 05/14/1986
  • Status: Expired due to Term
First Claim
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1. A wireless digital communication system comprising:

  • a broadcast station for transmitting a video signal at least including blanking intervals on a video carrier;

    broadcast means for controllably transmitting downlink signals on a second carrier; and

    a plurality of subscriber receiver-transmitters, each subscriber receiver-transmitter having a subscriber receiving means for receiving said video signal and detecting said blanking intervals, and for receiving and detecting said downlink signals, each subscriber receiver-transmitter also having a subscriber transmitting means coupled to said subscriber receiving means for transmitting uplink signals only during at least some of the blanking intervals of the received video signal; and

    at least one central receiver, each said central receiver being a means for receiving and detecting said uplink signals transmitted by each subscriber transmitting means.

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