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Related Experiment Videos

Bessel filtering of brain stem auditory evoked potentials.

D J Doyle, M L Hyde

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1981
    PubMed
    Summary

    Bessel high-pass filters distort brain stem auditory evoked potential (BAEP) waveforms, unlike digital zero-phase filters. Analog Bessel filters are not a suitable alternative for BAEP analysis due to significant phase non-linearity.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Conventional high-pass filtering of brain stem auditory evoked potentials (BAEPs) causes significant waveform distortion.
    • Digital zero-phase filters can reduce this distortion but require a digital computer.

    Purpose of the Study:

    • To evaluate the Bessel filter as an analog alternative to digital zero-phase filtering for BAEP analysis.
    • To determine if Bessel filters can mitigate waveform distortion in BAEPs.

    Main Methods:

    • Investigated the phase characteristics of Bessel filters, particularly for high-pass applications.
    • Compared the waveform distortion introduced by Bessel high-pass filters to that of conventional and digital zero-phase filters in BAEPs.

    Main Results:

    • Bessel filters exhibit approximately linear phase in the low-pass case.
    • Significant phase non-linearity in the high-pass Bessel filter extends into the pass band, causing substantial BAEP waveform distortion.
    • Bessel high-pass filters are not an acceptable alternative to zero-phase digital filtering for BAEP analysis.

    Conclusions:

    • Analog Bessel high-pass filters are unsuitable for BAEP analysis due to unacceptable waveform distortion.
    • Digital zero-phase filtering remains the preferred method for accurate BAEP analysis, despite requiring digital computation.

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