com.tagtraum.jipes.audio

Class Mel<T extends LinearFrequencySpectrum>

java.lang.Object

com.tagtraum.jipes.AbstractSignalProcessor<T,MelSpectrum>

com.tagtraum.jipes.audio.Mel<T>

All Implemented Interfaces:

SignalProcessor<T,MelSpectrum>, SignalPullProcessor<T,MelSpectrum>, SignalSource<MelSpectrum>

public class Mel<T extends LinearFrequencySpectrum>
extends AbstractSignalProcessor<T,MelSpectrum>

Assumes that the input is linear spectral data produced by some Transform and sums up the powers into bins, which are spaced according to the provided frequency boundaries.
You may choose between applying the internally created filterbank on the magnitudes or the powers of the linear spectrum.

Author:

Hendrik Schreiber

See Also:

MultiBandSpectrum.createLogarithmicBands(float, float, int), MelSpectrum

Field Summary

Fields inherited from class com.tagtraum.jipes.AbstractSignalProcessor

lastOut, signalProcessorSupport

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Mel()
protected	Mel(float[][] filterBank, float[] channelBoundariesInHz, boolean filterPowers)
	Mel(float lowerFrequency, float upperFrequency, int channels, boolean filterPowers) Creates a processor that converts a LinearFrequencySpectrum to a MelSpectrum.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
float[]	getBandBoundaries() Band boundaries.
float[][]	getFilterBank() Filterbank.
int	hashCode()
protected MelSpectrum	processNext(T audioSpectrum) Processes the given input and returns some output.
void	setBandBoundaries(float[] bandBoundaries)
void	setFilterBank(float[][] filterBank)
String	toString()

Methods inherited from class com.tagtraum.jipes.AbstractSignalProcessor

connectTo, connectTo, connectTo, disconnectFrom, flush, getConnectedProcessors, getConnectedSource, getId, getOutput, process, read, reset, setId

Methods inherited from class java.lang.Object

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

Constructor Detail

Mel

public Mel(float lowerFrequency,
           float upperFrequency,
           int channels,
           boolean filterPowers)

Creates a processor that converts a LinearFrequencySpectrum to a MelSpectrum.

Parameters:

lowerFrequency - lower frequency boundary

upperFrequency - upper frequency boundary

channels - mel channels

filterPowers - if true, the power spectrum is filtered, if false, the magnitude spectrum is filtered

Mel

protected Mel(float[][] filterBank,
              float[] channelBoundariesInHz,
              boolean filterPowers)

Mel

protected Mel()

Method Detail

getBandBoundaries

public float[] getBandBoundaries()

Band boundaries.

Returns:

band boundaries

setBandBoundaries

public void setBandBoundaries(float[] bandBoundaries)

getFilterBank

public float[][] getFilterBank()

Filterbank.

Returns:

filterbank

setFilterBank

public void setFilterBank(float[][] filterBank)

processNext

protected MelSpectrum processNext(T audioSpectrum)
                           throws IOException

Description copied from class: AbstractSignalProcessor

Processes the given input and returns some output.

Specified by:

processNext in class AbstractSignalProcessor<T extends LinearFrequencySpectrum,MelSpectrum>

Parameters:

audioSpectrum - input guaranteed not to be null.

Returns:

output produced by this processor

Throws:

IOException - if an IO error occurs

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