The control method in audio interface microphone pole and earth polar, module and circuit

The control method in audio interface microphone pole and earth polar, module and circuit

  • CN 103,379,396 B
  • Filed: 04/26/2012
  • Issued: 10/12/2018
  • Est. Priority Date: 04/26/2012
  • Status: Active Grant
First Claim
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1. a kind of control method of audio interface microphone pole and earth polar, including:

  • After audio frequency apparatus opens recording channel, electric current is established between a pair of of audio input pole in the audio interface of audio frequency apparatusOr voltage channel, external equipment ground potential is accessed in the node in the channel;

    And it obtains in the audio interface of the audio frequency apparatusA pair of of audio input extremely in each pole electric signal, specifically, each pole is set relative to outside in obtaining the pair of audio input extremelyThe voltage relative value of standby ground potential;

    According to the pair of audio input extremely in each pole electric signal identification Mike pole and earth polar;

    According to the pair of audio input extremely in each pole electric signal identification Mike pole and the method in earth polar be:

    It detects the pair ofAudio input extremely in each pole voltage relative value positive negative characteristic, identify the Mike pole and the earth polar according to testing result;

    Alternatively, according to the pair of audio input extremely in each pole electric signal identification Mike pole and the method in earth polar be:

    By the pair of audio input extremely in the voltage relative value of each pole be compared respectively with the ground potential, according to respectiveComparison result respectively obtains a digital signal level;

    The Mike pole and the earth polar are identified according to two obtained digital signal levels.

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