Filters

Class IIRFilterMethod

java.lang.Object

Filters.FilterMethod

Filters.IIRFilterMethod

Direct Known Subclasses:

ButterworthMethod, ChebyshevMethod

public abstract class IIRFilterMethod
extends FilterMethod

Constructor Summary

Constructors

Constructor and Description
IIRFilterMethod(double sampleRate, FilterParams filterParams)

Method Summary

Methods

Modifier and Type	Method and Description
void	calculateOmegaValues()
Filter	createFilter(int channel)
double[]	getFastFilterCoefficients() Get coefficients from poles and zeros for fast filter computations.
double	getFilterGain(double omega) Get the filter gain at an angular frequency (o < omega < pi).
double	getFilterGainConstant()
double	getFilterPhase(double omega) Get the filter phase at an angular frequency (o < omega < pi).
Complex[]	getPoles(FilterParams filterParams)
Complex[]	getZeros(FilterParams filterParams)
int	poleZeroCount()

Methods inherited from class Filters.FilterMethod

createFilterMethod, getFilterParams, getSampleRate, setFilterParams, setSampleRate

Methods inherited from class java.lang.Object

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

Constructor Detail

IIRFilterMethod

public IIRFilterMethod(double sampleRate,
               FilterParams filterParams)

Method Detail

getPoles

public Complex[] getPoles(FilterParams filterParams)

getZeros

public Complex[] getZeros(FilterParams filterParams)

poleZeroCount

public int poleZeroCount()

calculateOmegaValues

public void calculateOmegaValues()

getFastFilterCoefficients

public double[] getFastFilterCoefficients()

Get coefficients from poles and zeros for fast filter computations.

Overrides:

getFastFilterCoefficients in class FilterMethod

Returns:

getFilterGain

public double getFilterGain(double omega)

Description copied from class: FilterMethod

Get the filter gain at an angular frequency (o < omega < pi).

Specified by:

getFilterGain in class FilterMethod

Parameters:

omega - angular frequency

Returns:

gain

getFilterPhase

public double getFilterPhase(double omega)

Description copied from class: FilterMethod

Get the filter phase at an angular frequency (o < omega < pi).

Specified by:

getFilterPhase in class FilterMethod

Parameters:

omega - angular frequency

Returns:

phase

getFilterGainConstant

public double getFilterGainConstant()

Specified by:

getFilterGainConstant in class FilterMethod

Returns:

any additional gain constant (needed for IIRF's)

createFilter

public Filter createFilter(int channel)

Specified by:

createFilter in class FilterMethod

Parameters:

channel - channel number (used in filter book keeping)

Returns:

Create a filter object - which can actually do some filtering for us. Note that a filterMethod object may be asked to create multiple filters for multi-channel systems.