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Frequency Response of Filter

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  • September 28, 2017 at 9:15 am #16342
    Jonathan SmithJonathan Smith
    Participant

    Hi,

    how can I calculate the frequency response (e.g. magnitude) of specific filter coefficients in FPScript? For example: Simpson Integral Filter with coefficients b = (1/3, 4/3, 1/3) and a = (1, 0, -1).

    Thanks in advance.

    Jon

    September 28, 2017 at 9:31 am #16343
    Patrik StilgenbauerPatrik Stilgenbauer
    Member

    Dear Jon,

    you can use the AmplitudeResponse() and the PhaseResponse() functions to calculate the frequency response corresponding to a set of filter coefficients. E.g. magnitude of Simpson Integral filter:

    Dim filterCoef = List("b", {1/3, 4/3, 1/3}, "a", {1, 0, -1})
AmplitudeResponse(filterCoef)

    See attachment for the visualisation in a diagram.

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