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Re: Linear enveloping of EMG

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  • Re: Linear enveloping of EMG

    Dear At, Matthew, Jason, Drew, and others,

    As usual, a simple question turns out to be quite complex!

    I still say that the main operation in the linear envelope is the
    (strangely-enough) non-linear rectification stage. Without this one
    could not have an envelope at all.

    The envelope (low frequency shape superimposed on the high frequency
    spikes) is then smoothed to a greater or lesser extent by the filter. As
    At points out, the nature of the appropriate filter ad precise cut-off
    frequency used will depend on the behavior of the muscle at the time.

    Incidentally, I have always wondered why the LINEAR envelope is so named
    - what is linear about it?

    Dr. Chris Kirtley MD PhD
    Associate Professor
    HomeCare Technologies for the 21st Century (Whitaker Foundation)
    NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
    Dept. of Biomedical Engineering, Pangborn 105B
    Catholic University of America
    620 Michigan Ave NE
    Washington, DC 20064
    Tel. 202-319-6247, fax 202-319-4287

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