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FFT Filter Series Function

The FFT Filter series function takes only one source series. In this series function, a FFT is performed on the data in the source series to produce a frequency signal. The frequency signal is then filtered with a specific filter function. Finally, an inverse FFT series function is applied to the filtered frequency signal to produce the destination series.

The filter function can be customized on the FFT Filter tab-page of the Series Function dialog box. Normally, the filter function is a mathematical expression that makes use of the built-in variable Freq - which represents the FFT frequency expressed in terms of the Nyquist frequency. For example, the filter function IF[Freq >= 0 & Freq <= 0.02, 1, 0] is a band filter: if the FFT frequency is in the range [0, 0.02 3DPoint.htm 3DPoint.htm-e 3DPoint.htm.tmp-e 3Dline.htm 3Dline.htm-e 3Dline.htm.tmp-e 3Dline.htme AboutDatascene.htm AboutDatascene.htm-e AboutDatascene.htm.tmp-e AddSeriesFunction.htm AddSeriesFunction.htm-e AddSeriesFunction.htm.tmp-e AnalyzingData.htm AnalyzingData.htm-e AnalyzingData.htm.tmp-e AnimationViaSequence.htm AnimationViaSequence.htm-e AnimationViaSequence.htm.tmp-e AnimationViaTimeTravel.htm AnimationViaTimeTravel.htm-e AnimationViaTimeTravel.htm.tmp-e AnimatonGeneratorDialog.htm AnimatonGeneratorDialog.htm-e AnimatonGeneratorDialog.htm.tmp-e AnimeterDialog.htm AnimeterDialog.htm-e AnimeterDialog.htm.tmp-e Appmenu.htm Appmenu.htm-e Appmenu.htm.tmp-e Apptoolbar.htm Apptoolbar.htm-e Apptoolbar.htm.tmp-e Area.htm Area.htm-e Area.htm.tmp-e Arrow.htm Arrow.htm-e Arrow.htm.tmp-e AspectEditor.htm AspectEditor.htm-e AspectEditor.htm.tmp-e 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