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Power line carrier multi telephone extension system for full duplex conferencing between telephones

  • US 4,475,193 A
  • Filed: 09/30/1982
  • Issued: 10/02/1984
  • Est. Priority Date: 09/30/1982
  • Status: Expired due to Term
First Claim
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1. A System for signalling between stations on the power line in a building comprising,(a) a main station, denoted M, and one or more (up to N) satellite stations denoted E1, E2--En--EN.(b) a the M station:

  • (b1) an M transmitter that transmits information signals as modulations of the carrier frequency Fm,(b2) N receivers, one for each of the satellite stations, each for receiving a corresponding one of the satellite carrier frequencies F1, F2,--Fn-FN, each receiver detecting the corresponding satellite station information signal modulations of the station carrier frequency Fn and producing an output, representative thereof,(b3) means for combining the outputs for said M receivers producing a combined receiver output signal, referred to herein as MRXN,(b4) means for coupling said MRXN to the input of the M transmitter, and(b5) means for coupling the inputs to the said N receivers and the output of the M transmitter to the power line in the building;

    (b6) whereby all information signals from the N receivers are transmitted over the power line on the carrier Fm; and

    (c) at each satellite station, En;

    (c1) an En receiver for receiving Fm,(c2) an En transmitter for transmitting information signals as modulations of the station carrier frequency Fn,(c3) a source of En information signals,(c4) an En received signal utilization device,(c5) means for coupling the En source output to the En transmitter input,(c6) means for coupling the En receiver output to the En utilization device, and(c7) means for coupling the input of the En receiver and the output of the En transmitter to the power line in the building;

    (d) whereby two or more of said satellite stations can communicate with each other simultaneously, full duplex.

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