Patents Assigned to Theta-Com., Division of Texscan
  • Patent number: 4475123
    Abstract: An addressable cable television system includes a transmission cable for transmitting a plurality of television signals driven onto the cable from a head end thereof and a plurality of multiple subscriber controllers coupled to the cable for controlling reception of television signals by a plurality of subscribers associated with each of the multiple subscriber controllers. Each of the multiple subscriber controllers includes a plurality of programmable frequency converters, each of which is coupled by a drop cable to the antenna of a television receiver within the subscriber's home. Authorization signals are transmitted from the head end of the cable to the plurality of multiple subscriber controllers for indicating which of the plurality of television signals a particular subscriber is authorized to receive. Each subscriber is provided with channel request circuitry for transmitting a channel request over the drop cable to the associated multiple subscriber controller.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: October 2, 1984
    Assignee: Theta-Com., Division of Texscan
    Inventors: Lewis D. Dumbauld, Gilbert L. Tash