## org.das2.math.filter.Butterworth

A Butterworth low/high pass and band pass/reject filter. The implementation is based on a C version from http://www.exstrom.com/journal/sigproc

## Butterworth( QDataSet source, int order, Datum freq, boolean lowp )

Generate a Butterworth low/high pass filter at the given cutoff frequency

## Butterworth( QDataSet source, int order, Datum freq1, Datum freq2, boolean pass )

Generate a Butterworth band pass/reject filter at the given cutoff frequencies.

## SYNOPSIS

## toString

toString( ) → String

### Returns:

java.lang.String
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