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Method of signal processing for maintaining directional hearing with hearing aids

  • US 5,325,436 A
  • Filed: 06/30/1993
  • Issued: 06/28/1994
  • Est. Priority Date: 06/30/1993
  • Status: Expired due to Fees
First Claim
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1. A method for obtaining coefficients of a digital filter for use in compensating effects of a hearing aid, comprising the steps of:

  • determining an unaided head related transfer function for each ear and for a plurality of azimuth locations of a sound source;

    determining an aided head related transfer function for each ear having a hearing aid installed thereat and for the plurality of azimuth locations of the sound source;

    finding a minimum phase representation of the unaided head related transfer function;

    finding a minimum phase representation of the aided head related transfer function;

    calculating the ratio between the unaided minimum phase representation and the aided minimum phase representation to form a target filter response; and

    obtaining a plurality of filter coefficients by sampling the target filter response at a plurality of frequency values corresponding to frequency increments in the digital filter.

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