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Providing Ambient Naturalness in ANR Headphones

  • US 20160210958A1
  • Filed: 03/29/2016
  • Published: 07/21/2016
  • 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, the ear piece providing passive attenuation of ambient sound into the wearer'"'"'s ear;

    a feed-forward microphone acoustically coupled to an external environment and electrically coupled to a feed-forward active noise cancellation signal path having a feed-forward filter with configurable coefficients;

    an output transducer acoustically coupled to the wearer'"'"'s ear canal when the ear piece is coupled to the wearer'"'"'s ear and electrically coupled to the feed-forward active noise cancellation signal path; and

    a signal processor configured to apply the coefficients of the feed-forward filter,wherein the signal processor is configured to;

    apply a first set of feed-forward coefficients to the feed-forward filter that cause the feed-forward filter to generate anti-noise sounds to cancel ambient sound detected by the feed-forward microphone during a first operating mode,replace the first set of feed-forward coefficients with a second set of feed-forward coefficients in the feed-forward filter that cause the feed-forward filter to modify the ambient sound detected by the feed-forward microphone to compensate for changes in the ambient sound resulting from the passive attenuation of the ear piece during a second operating mode, andreplace the first or second set of feed-forward coefficients with a third set of feed-forward coefficients during a third operating mode providing active hear-through of ambient sounds with a different total response than is provided in the second operating mode.

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