de.quippy.javamod.mixer.dsp.iir.filter

Class IIRFilterBase

java.lang.Object

de.quippy.javamod.mixer.dsp.iir.filter.IIRFilterBase

Direct Known Subclasses:

IIRBandpassFilter, IIRHighpassFilter, IIRLowpassFilter

public abstract class IIRFilterBase
extends Object

Author:

Daniel Becker

Field Summary

Fields

Modifier and Type	Field and Description
protected float	alpha
protected float	amplitudeAdj
protected float	beta
protected int	frequency
protected float	gamma
protected static int	HISTORYSIZE
protected float[][]	inArray
protected float[][]	outArray
protected int	sampleRate

Constructor Summary

Constructors

Constructor and Description
IIRFilterBase() Default Constructor - to already set the GAIN

Method Summary

Methods

Modifier and Type	Method and Description
protected float	calcRadiansPerSample(float freq) Given a frequency of interest, calculate radians/sample
void	clearHistory() Clean the history
float	getAmplitudeAdj()
float	getGain() Get the amplitude adjustment in db value
static float	getIIRDBValueFrom(float decimalValue) convert from DeciBel to decimalValue
static float	getIIRDecimalValueFrom(float dbValue) Convert from decimalValue to DeciBel
protected float	getThetaZero() Return the radiant per sample at the frequency of interest
void	initialize(int sampleRate, int channels, int frequency, float parameter) Call this to initialize.
protected abstract float	performFilterCalculation(float sample, int channel, int iIndex, int jIndex, int kIndex)
void	setAmplitudeAdj(float newAmplitudeAdj) Set the amplitude adjustment to be applied to filtered data Values typically range from -.25 to +4.0.
void	setGain(float dbValue) Set the amplitude adjustment to be applied to filtered data Values typically range from -12 to +12 db.

Methods inherited from class java.lang.Object

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

Field Detail

frequency

protected int frequency

sampleRate

protected int sampleRate

HISTORYSIZE

protected static final int HISTORYSIZE

See Also:

Constant Field Values

inArray

protected float[][] inArray

outArray

protected float[][] outArray

alpha

protected float alpha

beta

protected float beta

gamma

protected float gamma

amplitudeAdj

protected float amplitudeAdj

Constructor Detail

IIRFilterBase

public IIRFilterBase()

Default Constructor - to already set the GAIN

Since:

09.01.2012

Method Detail

initialize

public void initialize(int sampleRate,
              int channels,
              int frequency,
              float parameter)

Call this to initialize. Will set the memory to 0

Since:

09.01.2012

clearHistory

public void clearHistory()

Clean the history

Since:

14.01.2012

getIIRDecimalValueFrom

public static float getIIRDecimalValueFrom(float dbValue)

Convert from decimalValue to DeciBel

Parameters:

dbValue -

Returns:

Since:

14.01.2012

getIIRDBValueFrom

public static float getIIRDBValueFrom(float decimalValue)

convert from DeciBel to decimalValue

Parameters:

decimalValue -

Returns:

Since:

14.01.2012

calcRadiansPerSample

protected float calcRadiansPerSample(float freq)

Given a frequency of interest, calculate radians/sample

Parameters:

freq -

Returns:

Since:

07.01.2012

getThetaZero

protected float getThetaZero()

Return the radiant per sample at the frequency of interest

Returns:

Since:

07.01.2012

setAmplitudeAdj

public void setAmplitudeAdj(float newAmplitudeAdj)

Set the amplitude adjustment to be applied to filtered data Values typically range from -.25 to +4.0.

Parameters:

amplitudeAdj -

Since:

09.01.2012

getAmplitudeAdj

public float getAmplitudeAdj()

setGain

public void setGain(float dbValue)

Set the amplitude adjustment to be applied to filtered data Values typically range from -12 to +12 db.

Parameters:

dbValue -

Since:

13.01.2012

getGain

public float getGain()

Get the amplitude adjustment in db value

Returns:

Since:

14.01.2012

performFilterCalculation

protected abstract float performFilterCalculation(float sample,
                             int channel,
                             int iIndex,
                             int jIndex,
                             int kIndex)

Parameters:

sample -

channel -

iIndex -

jIndex -

kIndex -

Returns:

Since:

12.01.2012