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Sound signal processing.

C H Chouard, B Meyer, F Chabolle

    Acta Oto-Laryngologica. Supplementum
    |January 1, 1984
    PubMed
    Summary
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    The CHORIMAC-12 French device transmits speech information via 12 channels to cochlear nerve fibers. Computerized tests demonstrate its effectiveness in speech intelligibility for hearing restoration.

    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Audiology

    Background:

    • Cochlear implants aim to restore hearing by stimulating remaining cochlear nerve fibers.
    • Effective speech processing is crucial for intelligibility in cochlear implant users.

    Purpose of the Study:

    • To describe the CHORIMAC-12, a French cochlear implant device.
    • To evaluate the performance of the CHORIMAC-12 system using psychophysical and speech intelligibility tests.

    Main Methods:

    • The CHORIMAC-12 system processes speech intensity (40-100 dB) into 12 frequency channels (100-6000 Hz).
    • Electrical stimulation uses square waves with adjustable frequency, voltage (2.5-6.5 V), and duration (0-200 μs).
    • A 12-electrode array or separate electrodes transmit signals; time sampling is 3 ms.

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    Main Results:

    • The system transmits comprehensive speech information, including intensity and frequency, to limited cochlear nerve fibers.
    • Computerized psychophysical and speech intelligibility tests were used to assess system performance.

    Conclusions:

    • The CHORIMAC-12 system effectively processes and transmits speech information for potential hearing restoration.
    • Performance evaluation through psychophysical and intelligibility tests validates the device's capabilities.