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Related Experiment Videos

Hearing aid measurements using the revised standard: reducing variability and determining test system accuracy

T H Townsend

    Journal of Speech and Hearing Research
    |June 1, 1980
    PubMed
    Summary

    This study assessed hearing aid performance measurement accuracy. Data from a meter were more precise than chart recordings, ensuring compliance with the ANSI S3.22-1976 standard.

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    Area of Science:

    • Audiology
    • Hearing Instrument Science

    Background:

    • The ANSI S3.22-1976 standard introduced specific tolerance requirements for hearing aid electroacoustic characteristics.
    • Accurate performance measurements are crucial for adhering to these new standards.

    Purpose of the Study:

    • To evaluate the precision of hearing aid performance measurements in a clinical setting.
    • To compare data acquisition methods (meter vs. chart) for variability.

    Main Methods:

    • Five identical hearing aids were tested five times each using Bruel and Kjaer instrumentation.
    • Data were collected directly from the measuring amplifier's meter and from chart paper.
    • System accuracy was assessed both theoretically and empirically.

    Main Results:

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    • Measurement variability was consistently lower when data were obtained directly from the meter compared to chart recordings.
    • The ratio of variability (meter:chart) varied depending on the specific test performed.
    • All tested hearing aids met the standard's performance limits when system tolerances were considered, with one exception.

    Conclusions:

    • Direct meter readings offer superior precision for hearing aid electroacoustic measurements in clinical environments.
    • The Bruel and Kjaer instrumentation, when used with direct meter readings, facilitates accurate assessment against the ANSI S3.22-1976 standard.
    • Minor deviations were observed in one instance, but overall compliance was high.