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Reducing Occlusion Effect in ANR Headphones

  • US 20140126735A1
  • Filed: 11/02/2012
  • Published: 05/08/2014
  • Est. Priority Date: 11/02/2012
  • Status: Active Grant
First Claim
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1. An active noise reducing headphone comprising:

  • an ear piece configured to couple to a wearer'"'"'s ear to define an acoustic volume comprising the volume of air within the wearer'"'"'s ear canal and a volume within the ear piece;

    a feedback microphone acoustically coupled to the acoustic volume and electrically coupled to a feedback active noise cancellation signal path;

    an output transducer acoustically coupled to the acoustic volume via the first volume and electrically coupled to the feedback signal path; and

    a signal processor configured to apply filters and control gains of the feedback signal path;

    wherein the signal processor is configured to;

    apply first feedback filters to the feedback signal path, the first feedback filters causing the feedback signal path to operate at a first gain level, as a function of frequency, during a first operating mode, andapply second feedback filters to the feedback signal path, the second feedback filters causing the feedback signal path to operate at a second gain level less than the first gain level at some frequencies during a second operating mode,the first gain level being a level of gain that results in effective cancellation of sounds transmitted through or around the ear piece and through the user'"'"'s head into the acoustic volume when the ear piece is coupled to the wearer'"'"'s ear, andthe second level being a level of gain that is matched to the level of sound of a typical wearer'"'"'s voice transmitted through the wearer'"'"'s head when the ear piece is coupled to the wearer'"'"'s ear.

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