de.gsi.math.filter.iir

Class Bessel

java.lang.Object

de.gsi.math.filter.iir.Cascade

de.gsi.math.filter.iir.Bessel

public class Bessel
extends Cascade

User facing class which contains all the methods the user uses to create Bessel filters. This done in this way: Bessel bessel = new Bessel(); Then call one of the methods below to create low-,high-,band-, or stopband filters. For example: bessel.bandPass(2,250,50,5);

Constructor Summary

Constructors

Constructor and Description
Bessel()

Method Summary

Modifier and Type	Method and Description
void	bandPass(int order, double sampleRate, double centerFrequency, double widthFrequency) Bandpass filter with default topology
void	bandPass(int order, double sampleRate, double centerFrequency, double widthFrequency, int directFormType) Bandpass filter with custom topology
void	bandStop(int order, double sampleRate, double centerFrequency, double widthFrequency) Bandstop filter with default topology
void	bandStop(int order, double sampleRate, double centerFrequency, double widthFrequency, int directFormType) Bandstop filter with custom topology
void	highPass(int order, double sampleRate, double cutoffFrequency) Highpass filter with default filter topology
void	highPass(int order, double sampleRate, double cutoffFrequency, int directFormType) Highpass filter with custom topology
void	lowPass(int order, double sampleRate, double cutoffFrequency) Bessel Lowpass filter with default topology
void	lowPass(int order, double sampleRate, double cutoffFrequency, int directFormType) Bessel Lowpass filter with custom topology

Methods inherited from class de.gsi.math.filter.iir.Cascade

applyScale, filter, getBiquad, getNumBiquads, reset, response, setLayout

Methods inherited from class java.lang.Object

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

Constructor Detail

Bessel

public Bessel()

Method Detail

bandPass

public void bandPass(int order,
                     double sampleRate,
                     double centerFrequency,
                     double widthFrequency)

Bandpass filter with default topology

Parameters:

order - Filter order

sampleRate - Sampling rate

centerFrequency - Center frequency

widthFrequency - Width of the notch

bandPass

public void bandPass(int order,
                     double sampleRate,
                     double centerFrequency,
                     double widthFrequency,
                     int directFormType)

Bandpass filter with custom topology

Parameters:

order - Filter order

sampleRate - Sampling rate

centerFrequency - Center frequency

widthFrequency - Width of the notch

directFormType - The filter topology (see DirectFormAbstract)

bandStop

public void bandStop(int order,
                     double sampleRate,
                     double centerFrequency,
                     double widthFrequency)

Bandstop filter with default topology

Parameters:

order - Filter order (actual order is twice)

sampleRate - Samping rate of the system

centerFrequency - Center frequency

widthFrequency - Width of the notch

bandStop

public void bandStop(int order,
                     double sampleRate,
                     double centerFrequency,
                     double widthFrequency,
                     int directFormType)

Bandstop filter with custom topology

Parameters:

order - Filter order (actual order is twice)

sampleRate - Samping rate of the system

centerFrequency - Center frequency

widthFrequency - Width of the notch

directFormType - The filter topology

highPass

public void highPass(int order,
                     double sampleRate,
                     double cutoffFrequency)

Highpass filter with default filter topology

Parameters:

order - Filter order (ideally only even orders)

sampleRate - Sampling rate of the system

cutoffFrequency - Cutoff of the system

highPass

public void highPass(int order,
                     double sampleRate,
                     double cutoffFrequency,
                     int directFormType)

Highpass filter with custom topology

Parameters:

order - Filter order (ideally only even orders)

sampleRate - Sampling rate of the system

cutoffFrequency - Cutoff of the system

directFormType - The filter topology. See DirectFormAbstract.

lowPass

public void lowPass(int order,
                    double sampleRate,
                    double cutoffFrequency)

Bessel Lowpass filter with default topology

Parameters:

order - The order of the filter

sampleRate - The sampling rate of the system

cutoffFrequency - the cutoff frequency

lowPass

public void lowPass(int order,
                    double sampleRate,
                    double cutoffFrequency,
                    int directFormType)

Bessel Lowpass filter with custom topology

Parameters:

order - The order of the filter

sampleRate - The sampling rate of the system

cutoffFrequency - The cutoff frequency

directFormType - The filter topology. This is either DirectFormAbstract.DIRECT_FORM_I or DIRECT_FORM_II