Preamplifier circuit for microphone

Preamplifier circuit for microphone

  • CN 102,438,194 A
  • Filed: 12/02/2011
  • Published: 05/02/2012
  • Est. Priority Date: 12/02/2011
  • Status: Active Application
First Claim
Patent Images

1. microphone pre-amplification circuit comprises at least:

  • The passive acoustic inductor;

    Auxiliary input unit;

    Preamplifier has two inputs at least, wherein one imports this passive acoustic inductor of termination, and another input was connected with assisting input unit;

    First control circuit is connected between the junction and ground of input of this passive acoustic inductor and this preamplifier, to control being connected of this passive acoustic inductor and this preamplifier;

    AndSecond control circuit is connected between the junction and ground of input of this auxiliary input unit and this preamplifier, to control being connected of this auxiliary input unit and this preamplifier.

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