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Noise canceling microphone system and method for designing the same

  • US 20050031136A1
  • Filed: 08/27/2004
  • Published: 02/10/2005
  • Est. Priority Date: 10/03/2001
  • Status: Active Grant
First Claim
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1. An active noise canceling microphone system comprising:

  • a first microphone element comprising a first back surface and a first sound pressure sensitive surface for receiving a first microphone signal comprising speech and noise and a second microphone element comprising a second back surface and a second sound pressure sensitive surface for receiving a second microphone signal containing primarily noise, wherein the first and second microphone elements have a diameter “

    d” and

    a thickness “

    t”

    ; and

    a hollow cylindrically shaped microphone housing having an outside diameter “

    D,”

    an interior cavity of diameter of “

    d,” and

    a height “

    2t”

    , wherein the microphone housing is adapted to secure the first and second microphone elements aligned axially with the back surfaces in contact, and wherein the ratio of “

    D”

    over “

    d”

    is between 1 and about 2.4.

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