Frequency Response of Filter

[Jonathan Smith]

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

[Patrik Stilgenbauer]

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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