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implementation of a critically damped filter in matlab

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  • implementation of a critically damped filter in matlab

    Dear list members,



    I was wondering how those of you who are using matlab to process their
    emg data implement a critically damped zero-lag digital filter as
    described by Robertson and Dowling (2003)? So far, I have been working
    with a digital zero-lag lowpass Butterworth filter using the "butter"
    and "filtfilt" function in matlab to create the linear envelope of an
    emg signal but the signal over- and undershoots. Is there an already
    implemented filter function one can use for a critically damped filter
    as well (e.g. IIR or FIR) or do you determine the lowpass coefficients
    manually?

    Thank you in advance for you advice.



    Florian



    PhD Student (Biomechanics)

    Centre for Sports Medicine and Human Performance

    Brunel University, West London

    United Kingdom


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