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Method and apparatus for cordless microphone communication system

  • US 4,876,710 A
  • Filed: 01/05/1987
  • Issued: 10/24/1989
  • Est. Priority Date: 10/10/1986
  • Status: Expired due to Fees
First Claim
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1. In a communications system comprising vehicle mounted transceiver means for receiving an input message and for transmitting a signal comprised of said input message as modulated with a first carrier frequency signal, an improvement comprising:

  • portable transmitter means for transmitting a message signal and an ID signal as modulated with a second carrier frequency signal, the portable transmitter means including;

    push-to-talk switch means for providing a push-to-talk signal;

    strobe means responsive to said push-to-talk signal for providing an initial strobe signal;

    microprocessor means responsive to said strobe signal controlling transmission of said ID signal;

    wherein said microprocessor means are usually switched off until said microprocessor means receives said strobe signal;

    vehicle mounted received means for receiving said message signal and said ID signal, for providing said message signal to said transceiver means, and for allowing said transceiver means to transmit said message signal as said input message when said ID signal represents a proper ID signal.

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