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Directional hearing aid based on array technology

W Soede1, F A Bilsen, A J Berkhout

  • 1Delft University of Technology, Faculty of Applied Physics, The Netherlands.

Scandinavian Audiology. Supplementum
|January 1, 1993
PubMed
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New directional microphone arrays significantly improve speech understanding for the hearing impaired. These advanced hearing aid systems reduce background noise, enhancing the signal-to-noise ratio by an average of 7.0 dB.

Area of Science:

  • Audiology
  • Acoustics
  • Biomedical Engineering

Background:

  • Hearing impairment causes significant challenges in understanding speech amidst background noise and reverberation.
  • Directional hearing aids offer a potential solution by enhancing the desired speech signal relative to ambient noise.

Purpose of the Study:

  • To develop and evaluate novel microphone array systems with strong directional characteristics for hearing aids.
  • To assess the performance of these systems in improving speech intelligibility in noisy environments for hearing-impaired individuals.

Main Methods:

  • Development of microphone arrays using array techniques, focusing on optimization and stability.
  • Free-field simulations and laboratory model verification to determine directivity index (achieved 9 dB).

Related Experiment Videos

  • Testing of two portable prototypes using a KEMAR manikin and listening tests with 45 hearing-impaired subjects in a controlled sound environment.

    • Main Results:

    • Simulations indicated a directivity index of 9 dB.
    • KEMAR manikin tests showed a 7 dB improvement in signal-to-noise ratio (SNR) in a diffuse sound field.
    • Listening tests with hearing-impaired subjects demonstrated an average SNR improvement of 7.0 dB for monaural fitting.

    Conclusions:

    • The developed directional microphone arrays are effective in reducing background noise for hearing aids.
    • These systems offer a significant benefit to the hearing impaired by improving speech reception in noisy conditions.
    • The study validates the efficacy of array techniques in enhancing directional hearing aid performance.