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Communication system interface circuit

  • US 4,010,327 A
  • Filed: 05/11/1976
  • Issued: 03/01/1977
  • Est. Priority Date: 05/11/1976
  • Status: Expired due to Term
First Claim
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1. In a communication system having first and second stations, the first station generating a DC signal voltage referenced to a ground potential, the two stations being intercoupled by a balanced line which is isolated from the ground potential, the improvement comprising:

  • Dc-to-AC converter means for converting said DC signal voltage to a corresponding AC signal voltage;

    Ac-to-DC converter means for converting AC signals, at its input, to corresponding DC signals, at its output;

    Ac coupling means for AC coupling, but DC blocking, the AC signal voltage, from the DC-to-AC converter, to the input of the AC-to-DC converter; and

    line coupling means for coupling the output of the AC-to-DC converter to the balanced line for transmission to the second station thereon.

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