com.tagtraum.jipes.math

Class Filters.FIRFilter

java.lang.Object

com.tagtraum.jipes.math.Filters.FIRFilter

All Implemented Interfaces:

MapFunction<float[]>, StatefulMapFunction<float[]>

Direct Known Subclasses:

MultirateFilters.Decimator

Enclosing class:

Filters

public static class Filters.FIRFilter
extends Object
implements StatefulMapFunction<float[]>

FIR (finite impulse response) filter.

To compute the coefficients you might want to use Matlab or the free package Octave (with additional Octave-Forge packages needed for signals). E.g. for a low pass filter you could execute:

b = fir1(16,0.125)

Author:

Hendrik Schreiber

See Also:

Wikipedia on FIR, Filters.IIRFilter

Field Summary

Fields

Modifier and Type	Field and Description
static Filters.FIRFilter	NOOP Efficient no-op FIR filter.

Constructor Summary

Constructors

Constructor and Description
FIRFilter()
FIRFilter(double[] coefficients)

Method Summary

Modifier and Type	Method and Description
protected void	addToDelayLine(double sample)
boolean	equals(Object o)
protected double	filter()
double[]	getCoefficients()
int	hashCode()
float[]	map(float[] data) Maps an object (usually an array, an RealAudioBuffer or a List) to another one of the same size.
void	reset() Resets the function's state.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

NOOP

public static Filters.FIRFilter NOOP

Efficient no-op FIR filter.

Constructor Detail

FIRFilter

public FIRFilter()

FIRFilter

public FIRFilter(double[] coefficients)

Method Detail

getCoefficients

public double[] getCoefficients()

reset

public void reset()

Description copied from interface: StatefulMapFunction

Resets the function's state.

Specified by:

reset in interface StatefulMapFunction<float[]>

map

public float[] map(float[] data)

Description copied from interface: MapFunction

Maps an object (usually an array, an RealAudioBuffer or a List) to another one of the same size.

Specified by:

map in interface MapFunction<float[]>

Parameters:

data - data

Returns:

mapped data

addToDelayLine

protected void addToDelayLine(double sample)

filter

protected double filter()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object