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A signal processor for a multiple-electrode hearing prosthesis.

P M Seligman, J F Patrick, Y C Tong

    Acta Oto-Laryngologica. Supplementum
    |January 1, 1984
    PubMed
    Summary
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    This study introduces a 22-electrode implantable hearing prosthesis with a speech processor. It effectively estimates and utilizes voice pitch, formant frequency, and amplitude for enhanced auditory perception in hearing loss patients.

    Area of Science:

    • Audiology
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Hearing loss impacts millions globally, necessitating advanced assistive listening devices.
    • Current hearing prostheses often struggle to fully restore natural speech perception.
    • Implantable hearing prostheses offer a promising avenue for more integrated and effective hearing restoration.

    Purpose of the Study:

    • To develop and evaluate a novel 22-electrode implantable hearing prosthesis.
    • To enhance speech signal processing for improved auditory feedback.
    • To investigate the efficacy of using voice pitch, second formant frequency, and spectral amplitude for auditory stimulation.

    Main Methods:

    • A wearable speech processor estimates three key speech parameters: voice pitch, second formant frequency, and flattened spectrum amplitude.

    Related Experiment Videos

  • The prosthesis monitors signal periodicity for rate-controlled stimulation or uses envelope fluctuation for random rate stimulation.
  • Second formant frequency is determined by filtering and zero-crossing rate measurement; amplitude is derived from pre-emphasized spectral analysis.
  • Electrode selection in the cochlea codes formant frequency, and controlled current codes amplitude, with automatic gain control managing dynamic range.

    • Main Results:

    • The system successfully estimates and utilizes voice pitch, second formant frequency, and spectral amplitude for real-time auditory stimulation.
    • Stimulation rate is dynamically adjusted based on voiced/unvoiced sound detection.
    • Parameter estimates are presented to the patient immediately prior to stimulation pulses, ensuring temporal accuracy.

    Conclusions:

    • The developed 22-electrode implantable hearing prosthesis demonstrates a sophisticated approach to speech processing for hearing restoration.
    • The method of coding speech parameters offers a potentially more nuanced auditory experience for users.
    • Further clinical evaluation is warranted to confirm the benefits for speech understanding and overall quality of life.