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Head diffraction effects on ear-level hearing aids.

W Olsen, R Carhart

    Audiology : Official Organ of the International Society of Audiology
    |May 1, 1975
    PubMed
    Summary
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    This study measured head baffle and head shadow effects on hearing aid microphones using human subjects and a dummy head. Findings suggest specific frequency responses may benefit hearing aid wearers.

    Area of Science:

    • Acoustics
    • Bioacoustics
    • Hearing Aid Technology

    Background:

    • Head baffle and head shadow effects significantly impact sound perception for hearing aid users.
    • Understanding these acoustic phenomena is crucial for optimizing hearing aid microphone placement and design.

    Purpose of the Study:

    • To quantify head baffle and head shadow effects at front and back microphones of a hearing aid.
    • To compare measurements from human subjects with those from a dummy head.
    • To compare hearing aid microphone effects with ear canal entrance effects.

    Main Methods:

    • Measurements of head baffle and head shadow effects were conducted using a hearing aid casing.
    • Testing involved both human subjects wearing the device and a dummy head setup.

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  • Results were compared with existing data measured at the ear canal entrance.

    • Main Results:

    • Greater head baffle effects were observed at the front microphone compared to the back.
    • Conversely, head shadow effects were more pronounced at the back microphone.
    • Measurements on a dummy head showed similarities and differences compared to human subjects.
    • Hearing aid microphone effects differed from ear canal entrance effects, with smaller baffle and larger shadow effects.

    Conclusions:

    • Head baffle and head shadow effects vary depending on microphone orientation and measurement setup.
    • A resonance peak around 3000 Hz and reproduction of frequencies above 2000 Hz may enhance hearing aid performance.