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Related Experiment Videos

A programmable sound processor for advanced hearing aid research

H McDermott1

  • 1Co-operative Research Center for Cochlear Implant, Speech, and Hearing Research, Department of Otolaryngology, The University of Melbourne, East Melbourne, Australia.

IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|April 16, 1998
PubMed
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A new portable sound processor enables advanced hearing aid research. This digital device offers personalized frequency amplification, significantly improving speech perception for users with severe hearing loss compared to traditional hearing aids.

Area of Science:

  • Audiology
  • Digital Signal Processing
  • Biomedical Engineering

Background:

  • Advanced hearing aids require flexible research platforms.
  • Existing hearing aids often lack personalized frequency response.
  • Digital signal processing (DSP) offers potential for improved hearing aid algorithms.

Purpose of the Study:

  • To develop a portable, programmable sound processor for advanced hearing aid research.
  • To enable rapid adjustment of hearing aid parameters for individual user needs.
  • To investigate the efficacy of digital filtering for frequency-shaped amplification.

Main Methods:

  • A pocket-sized, battery-powered sound processor utilizing a Motorola DSP56001 integrated circuit.
  • Digitization of microphone signals (12-bit precision, ~12 kHz sampling rate) for DSP input.

Related Experiment Videos

  • A fully-digital class-D earphone driver and a custom switched-capacitor integrated circuit with 20 bandpass filters for spectral analysis.
  • Integration of a cochlear implant driver for combined implant and hearing aid use.

    • Main Results:

    • The processor successfully executed novel, programmable algorithms for hearing aid research.
    • A fully-digital class-D driver offered high output and low power consumption.
    • Running spectral analysis reduced computational load on the DSP.
    • Speech perception tests showed significantly better performance with the digital processor compared to subjects' own hearing aids.

    Conclusions:

    • The developed portable sound processor is a versatile tool for advanced hearing aid research.
    • Digital, frequency-shaped amplification tailored to individual hearing loss provides superior speech perception.
    • The processor's design, including the digital class-D driver and spectral analysis, enhances performance and efficiency.
    • This technology holds promise for improving hearing rehabilitation for individuals with severe hearing impairment.