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Microphone environmental protection device

  • US 9,609,411 B2
  • Filed: 06/09/2015
  • Issued: 03/28/2017
  • Est. Priority Date: 01/11/2013
  • Status: Active Grant
First Claim
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1. An environmental protection device comprising:

  • a chamber comprising a plurality of sides enclosing a volume, one of the plurality of sides being formed by an outer surface of an earcup exposed to an ambient environment from which sound is to be detected by a microphone, at least part of the outer surface forming a perforated barrier which is perforated by at least one perforation passing through the outer surface from an ambient environment into the chamber;

    the microphone having a microphone sensing surface, located in an upper region of the chamber, above at least one of the perforations;

    a drain tube having a first end coupled to a lower region of the chamber and a second end coupled to a drain output for draining fluids from the chamber into the ambient environment located in the outer surface below a bottom of the perforated barrier; and

    wherein an acoustic mass of the perforated barrier combined with an acoustic compliance of the chamber forms an acoustic resonator amplifying the sound at the microphone sensing surface by acoustic means around a resonance frequency of between 1 kHz and 8 kHz.

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