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Microphone

  • US 6,154,554 A
  • Filed: 11/06/1996
  • Issued: 11/28/2000
  • Est. Priority Date: 04/30/1996
  • Status: Expired due to Fees
First Claim
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1. A microphone including a microphone case;

  • a resonator formed into the shape of a plate, said resonator having a front face corresponding to a bottom face of the plate and an opening on the front face for introducing sound waves thereinto, said resonator mounted to a forward portion of said microphone case to form a resonance portion; and

    a microphone unit in the microphone case directly adjacent said resonance portion for converting the sound waves passing through the opening of the resonator, into electric signals, said microphone further including said resonator having a diameter substantially equal to that of said microphone case and having an inner wall spaced from an inner face of said microphone case thereby dividing said resonance portion into a central air chamber having a first acoustic capacity with a constant arcular cross-section and a circumferential air chamber having a second acoustic capacity, said second acoustic capacity being concentric with said first acoustic capacity, said second acoustic capacity capable of communicating with said first acoustic capacity through a plurality of discrete openings in said wall separating said first acoustic capacity from said second acoustic capacity to control resonance frequency.

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