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Flexibility in Frequency Response Shaping and Signal Processing With Analog Hearing Aids.

D A Preves

    American Journal of Audiology
    |December 15, 2015
    PubMed
    Summary

    Miniaturized analog semiconductor technology enables sophisticated amplifiers in small hearing aids, improving sound quality and speech clarity. These advancements offer flexibility in hearing aid fittings, highlighting the continued relevance of analog circuitry.

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    Area of Science:

    • Audiology
    • Electrical Engineering
    • Signal Processing

    Background:

    • Historically, packaging constraints limited hearing aid amplifiers to linear processing and Class A output stages.
    • Miniaturization of analog semiconductor technology now allows for more complex circuitry in in-the-ear (ITE) and in-the-canal (ITC) hearing aids.

    Purpose of the Study:

    • To explore the impact of recent advancements in analog semiconductor technology on hearing aid design and performance.
    • To evaluate the benefits of sophisticated analog circuitry in ITE and ITC hearing aids.

    Main Methods:

    • Utilizing advances in low-voltage CMOS circuitry for analog hearing aid development.
    • Implementing multiband amplifiers with steep filter slopes in small, nonprogrammable hearing instruments.

    Main Results:

    • Sophisticated analog circuitry and push-pull/Class D output stages are now feasible in ITE and ITC hearing aids.
    • These advancements improve sound quality, enhance speech signals (emphasizing consonants), offer flexible frequency response shaping, and reduce noise amplification.
    • Small, nonprogrammable analog hearing aids with multiband amplifiers provide effective frequency response shaping via simple adjustments.

    Conclusions:

    • Analog circuitry continues to offer significant advantages in hearing aid technology, particularly for ITE and ITC devices.
    • Despite the promise of digital signal processing, the capabilities of advanced analog electronics are still being exploited and should not be abandoned.
    • Current analog advancements provide practical solutions for hearing aid fittings, emphasizing the ongoing value of analog approaches.