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Headset for hands-free wireless telephone

  • US 5,794,163 A
  • Filed: 06/07/1995
  • Issued: 08/11/1998
  • Est. Priority Date: 07/27/1993
  • Status: Expired due to Term
First Claim
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1. A wireless telephone for receiving digitized voice information transmitted at a radio frequency, converting the received digitized voice information into a received audio signal on a speaker audio line, converting a transmit audio signal of a users voice on a microphone audio line into digitized voice information, and transmitting the digitized voice information at the radio frequency, the wireless telephone comprising:

  • a microphone for receiving the user'"'"'s voice and generating the transmit audio signal on a microphone output;

    a switch coupled in series between the microphoneoutput and the microphone audio linemeans within the wireless telephone coupled to the microphone audio line for providing a bias current to the microphonemeans having an input coupled to the microphone audio line and a binary output for generating a microphone current detect logic signal on the binary output when current is in the microphone audio line; and

    a digital logic circuit having an input coupled to the binary output, the digital logic circuit including means responsive to the binary output for generating a ringing signal on the speaker audio line when an incoming call is received, means responsive to the binary output for answering the incoming call, and means responsive to binary output for placing an outgoing call.

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