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Telephone patch

  • US 4,012,596 A
  • Filed: 08/06/1975
  • Issued: 03/15/1977
  • Est. Priority Date: 08/06/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus for interconnecting a wire telephone line with a simplex radio system including a radio receiver having an audio output and a radio transmitter having an audio input, said apparatus comprising receiver switch means operable between a normal open condition disconnecting the receiver audio output from the telephone line and a closed condition connecting the receiver audio output to the telephone line, receiver control means coupled to said receiver switch means for controlling the operation thereof between the open and closed conditions thereof, receiver amplifying means coupled to said receiver control means and to the receiver audio output for generating a first control signal from the unrectified A.C. audio signals from the receiver and applying such control signal directly to said receiver control means with a time delay of not greater than about five milliseconds, said receiver control means being responsive to the first control signal for closing said receiver switch means for the duration of the first control signal to couple the A.C. audio signals to the telephone line, transmitter switch means operable between a normal open condition disconnecting the telephone line from the transmitter audio input and a closed condition connecting the telephone line to the transmitter audio input, transmitter control means coupled to said transmitter switch means for controlling the operation thereof between the open and closed conditions thereof, and transmitter amplifying means coupled to said transmitter control means and to the telephone line for generating a second control signal from the unrectified A.C. audio signals from the telephone line and applying such control signal directly to said transmitter control means with a time delay of not greater than about five milliseconds, said transmitter control means being responsive to the second control signal for closing said tramsmitter switch means for the duration of the second control signal to couple the telephone line A.C. audio signals to the transmitter.

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