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Method and apparatus for overriding a PTT switch to activate a microphone

  • US 9,337,880 B2
  • Filed: 08/30/2012
  • Issued: 05/10/2016
  • Est. Priority Date: 08/30/2012
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a microphone operable with a direct current (DC) bias voltage in both a first voltage range and a second voltage range;

    a push to talk (PTT) switch electrically coupled in series with the microphone between the microphone and a microphone input; and

    a voltage controlled switch circuit comprising a first transistor switch element coupled in parallel with the PTT switch, and a second transistor switch coupled to the first transistor switch that is operable to close the first transistor switch only when an input voltage on the microphone input is in the first voltage range, and to open the first transistor switch when the input voltage on the microphone line is not in the first voltage range.

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