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Telephone controller apparatus

  • US 5,265,154 A
  • Filed: 11/05/1990
  • Issued: 11/23/1993
  • Est. Priority Date: 11/05/1990
  • Status: Expired due to Term
First Claim
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1. Apparatus for selectively enabling/disabling one or more of a plurality of telephones, said plurality of telephones being coupled to two local telephone lines for supplying voice communication thereto and therefrom, said apparatus comprising:

  • switch means for producing a respective output signal for enabling or disabling each selected telephone;

    transmitter means for transmitting control signals through said two local telephone lines which supply voice communication to and from said telephones, in which said transmitter means transmits a respective one of said control signals in response to each said output signal from said switch means and in which each of said control signals has a respective frequency within a predetermined frequency range which corresponds to the enabling or disabling of the selected telephone; and

    a plurality of receiver means connected to said two local telephone lines which supply voice communication to and from said telephones, each said receiver means being respectively coupled to one of said telephones and including a plurality of resonant circuits each tuned to a respective frequency corresponding to one of enabling or disabling of the respective telephone coupled thereto and in which each said receiver means receives each of the transmitted control signals from said transmitter means so as to selectively connect or disconnect each selected telephone to or from said two local telephone lines, respectively, in response to each of said transmitted control signals, thereby enabling or disabling each selected telephone, each said receiver means further including means for maintaining the connection to or disconnection from said two local telephone lines of the selected telephone coupled thereto so as to be enabled or disabled until the respective receiver means receives another transmitted control signal which corresponds to the other of the respective enabling or disabling.

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