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Related Experiment Videos

Measurement of attack-release times in compression hearing aids

J L Punch, W F Lawrence, G D Causey

    Journal of Speech and Hearing Research
    |June 1, 1978
    PubMed
    Summary

    This study presents a system for measuring hearing aid attack and release times, crucial for automatic gain control (AGC) function testing. The developed method aligns with the American National Standards Institute (ANSI) S3.22-1976 standard for hearing aid measurements.

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    Area of Science:

    • Audiology
    • Acoustics
    • Signal Processing

    Background:

    • Accurate measurement of hearing aid performance is essential for effective audiological rehabilitation.
    • Automatic gain control (AGC) circuitry significantly impacts hearing aid output and speech intelligibility.
    • Existing standards provide a framework for hearing aid testing, but require specific implementation for dynamic parameters.

    Purpose of the Study:

    • To describe a system for measuring attack and release times in hearing aids with AGC.
    • To facilitate the implementation of the American National Standards Institute (ANSI) S3.22-1976 standard for hearing aid measurements.
    • To propose a method for calculating attack and release times that accommodates various output waveform shapes.

    Main Methods:

    • Utilized a phased-array loudspeaker system to generate transient-free pulsed acoustic sinusoids.
    • Employed a commercial transient recorder for capturing output waveforms.
    • Displayed captured waveforms in oscilloscopic or graphic modes for analysis.

    Main Results:

    • Successfully developed and described a system for measuring hearing aid attack and release times.
    • Demonstrated a method for calculating these times compatible with the ANSI S3.22-1976 standard.
    • The system is capable of handling diverse output waveform characteristics.

    Conclusions:

    • The described system provides a reliable method for assessing critical dynamic parameters of hearing aids.
    • This implementation supports adherence to established audiological testing standards.
    • The proposed calculation method enhances the adaptability of the ANSI standard for real-world hearing aid performance analysis.

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