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Cellular telephone headset

  • US 5,191,602 A
  • Filed: 01/09/1991
  • Issued: 03/02/1993
  • Est. Priority Date: 01/09/1991
  • Status: Expired due to Fees
First Claim
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1. A cellular telephone system comprising:

  • a cellular telephone transceiver;

    a receive line originating from said transceiver, for carrying AC voice signals from said transceiver;

    a transmit the terminating at said transceiver, for carrying AC voice signals to said transceiver;

    a cellular telephone handset having a handset receiver and a handset microphone;

    a headset having a headset receiver and a headset microphone;

    a slave unit coupled to said receive line and said transmit line and adapted to selectively apply a low, medium, and high DC voltage level to said receive line;

    a headset control unit coupled to said receive line and said transmit line and responsive to said DC voltage level to selectively couple said handset and said headset to said receive line and said transmit line;

    wherein said headset control unit is responsive to said low DC voltage level to couple only said handset to said transmit and receive lines, and is responsive to said medium DC voltage level to couple said handset and said headset to said transmit and receive lines, and is responsive to said high DC voltage level to couple only said headset to said transmit and receive lines.

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