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Cordless telephone system

  • US 4,661,970 A
  • Filed: 05/28/1986
  • Issued: 04/28/1987
  • Est. Priority Date: 05/30/1985
  • Status: Expired due to Term
First Claim
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1. A cordless telephone system including a plurality of radiophones, each having a first transmitter and a first receiver of different transmission and reception frequencies;

  • and a radio station, wired to a telephone line,said radio station comprising;

    a second receiver and a second transmitter, having reception and transmission frequencies which are respectively same as the transmission and reception frequencies of said radiophones;

    switching means for connecting an input terminal of said second transmitter and an output terminal of said second receiver to said telephone line, or for connecting said input terminal of said second transmitter and said output terminal of said second receiver in accordance with a switching control signal; and

    control means for receiving a control signal from said radiophones through said second receiver and supplying the switching control signal to said switching means, wherein half duplex communication can be performed between said radiophones.

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