Generates a digital Butterworth filter by calling the Butterworth Coefficients VI. Wire data to the X input to determine the polymorphic instance to use or manually select the instance.


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After calling the Butterworth Coefficients VI, the Butterworth Filter VI calls the IIR Cascade Filter VI to obtain a Butterworth Filtered X sequence.

The values for high cutoff freq: fh and low cutoff freq: fl must observe the following relationship:

0 < f1 < f2 < 0.5fs

where f1 is low cutoff freq: fl, f2 is high cutoff freq: fh, and fs is sampling freq: fs.

Examples

Refer to the following example files included with LabVIEW.

  • labview\examples\Signal Processing\Filters\Extract the Sine Wave.vi