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Related Experiment Videos

Digital inverse filtering of distorted auditory brainstem responses

D J Doyle, M L Hyde

    Scandinavian Audiology
    |January 1, 1981
    PubMed
    Summary

    Analogue filtering distorts auditory brainstem response (ABR) waveforms, causing lab incompatibility. Digital phase-correction successfully corrects these distortions, enabling ABR waveform standardization across different filter conditions.

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    Area of Science:

    • Auditory Neuroscience
    • Signal Processing
    • Biomedical Engineering

    Background:

    • Analogue filtering of source data introduces significant distortion in Auditory Brainstem Response (ABR) waveforms, primarily due to filter phase non-linearity.
    • This distortion leads to incompatibility issues in ABR data collection and analysis across different laboratories.
    • While digital zero-phase filtering reduces distortion, it can complicate data acquisition protocols.

    Purpose of the Study:

    • To investigate the feasibility and effectiveness of digital phase-correction for distorted ABR waveforms.
    • To assess the potential for digitally recovering ABRs recorded with different filter parameters or bandwidths.
    • To establish a method for standardizing ABR waveforms across laboratories with varying filter conditions.

    Main Methods:

    • Development and application of a digital phase-correction algorithm to average ABRs recorded with conventional analogue filters.
    • Evaluation of the algorithm's ability to correct waveform distortion.
    • Testing the digital recovery of ABRs simulating wider recording bandwidths and different filter orders.

    Main Results:

    • The digital phase-correction method proved successful and feasible in correcting distorted ABR waveforms.
    • It is possible to digitally recover ABR waveforms that would have been obtained with wider recording bandwidths.
    • The method allows for the digital recovery of ABRs as if recorded with different filter orders.

    Conclusions:

    • Digital phase-correction is a viable approach to mitigate distortion caused by conventional analogue filtering in ABR recordings.
    • This technique facilitates the conversion of ABR waveforms to a standard low-distortion filter condition.
    • The method enables harmonization of ABR data across laboratories by allowing conversion between different conventional filter conditions.

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