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Directional microphone assembly

  • US 5,878,147 A
  • Filed: 12/31/1996
  • Issued: 03/02/1999
  • Est. Priority Date: 12/31/1996
  • Status: Expired due to Fees
First Claim
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1. A microphone capsule for an in-the-ear hearing aid, comprising:

  • A. a top plate defining an exterior portion of said capsule as worn, said top plate having first and second spaced openings defining front and rear sound inlets, said top plate generally defining a plane;

    B. a directional microphone cartridge comprising a directional microphone cartridge housing and a diaphragm mounted within said directional microphone cartridge housing, said diaphragm being oriented generally perpendicular to said top plate and dividing said directional microphone cartridge housing into a front chamber and a rear chamber, said directional microphone cartridge housing having a pair of opposed walls extending generally perpendicular to said top plate;

    C. a front sound passage communicating between said front sound inlet and said front chamber; and

    D. a rear sound passage communicating between said rear sound inlet and said rear chamber, said pair of opposed walls having a front opening communicating between said front sound passage and said front chamber and a rear opening communicating between said rear sound passage and said rear chamber, said front and rear opening dividing said pair of opposed walls into a longer upper portion and a shorter lower portion.

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