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Collapsible image derived differential microphone

  • US 5,748,757 A
  • Filed: 12/27/1995
  • Issued: 05/05/1998
  • Est. Priority Date: 12/27/1995
  • Status: Expired due to Term
First Claim
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1. An acoustic signal receiving apparatus comprisinga housing having an acoustically reflecting surface;

  • anda directional acoustic sensor unit having a first-order gradient response characteristic, the sensor unit mechanically coupled to the housing with use of a retractable member having a retracted position and an extended position,such that, when the member is in the extended position, the sensor unit is positioned relative to the reflecting surface wherein acoustic interaction between the sensor unit and the reflecting surface causes an output of the sensor unit to have a second-order gradient response characteristic.

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