com.oregondsp.signalProcessing.filter.iir
Class Butterworth

java.lang.Object
  com.oregondsp.signalProcessing.filter.iir.IIRFilter
      com.oregondsp.signalProcessing.filter.iir.Butterworth

public class Butterworth
extends IIRFilter

Class to implement digital Butterworth filters.

Author:

David B. Harris, Deschutes Signal Processing LLC

Constructor Summary

Butterworth(int order, PassbandType type, double f1, double f2, double delta)
Instantiates a new Butterworth digital filter.

Method Summary

Methods inherited from class com.oregondsp.signalProcessing.filter.iir.IIRFilter

evaluate, filter, filter, filter, groupDelay, initialize, print

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Butterworth

public Butterworth(int order,
                   PassbandType type,
                   double f1,
                   double f2,
                   double delta)

Instantiates a new Butterworth digital filter.

Parameters:

order - int specifying the order (number of poles) of the filter.

type - PassbandType specifying whether the filter is a lowpass, bandpass or highpass filter.

f1 - double specifying the low cutoff frequency (must always be present, but used only for bandpass and highpass filters).

f2 - double specifying the high cutoff frequency (must always be present, but used only for bandpass and lowpass filters).

delta - double specifying the sampling interval of the data to which this filter will be applied.