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Fourier filter

This function can be used to apply a Fourier filter to any data consisting of x- and y-columns. Supported filter types are:

  • Low pass

  • High pass

  • Band pass

  • Band reject (band block)

where any of them can have the form

  • Ideal

  • Butterworth (order 1 to 10)

  • Chebyshev type I or II (order 1 to 10)

  • Optimal "L"egendre (order 1 to 10)

  • Bessel-Thomson (any order)

The cutoff value(s) can be specified in the units frequency (Hertz), fraction (0.0 to 1.0) or index of the data points.