net.beadsproject.beads.analysis.featureextractors

Class MelSpectrum

java.lang.Object

net.beadsproject.beads.core.Bead

net.beadsproject.beads.analysis.FeatureExtractor<float[],float[]>

net.beadsproject.beads.analysis.featureextractors.MelSpectrum

public class MelSpectrum
extends FeatureExtractor<float[],float[]>

MelSpectrum receives spectral data from a PowerSpectrum object and converts it to the mel frequency spectrum. To use MelSpectrum, make sure it is set as a listener to a PowerSpectrum object, not directly from an audio stream.

Field Summary

Fields

Modifier and Type	Field and Description
static float	LOG10

Fields inherited from class net.beadsproject.beads.analysis.FeatureExtractor

featureDescriptions, features, name, numFeatures

Constructor Summary

Constructors

Constructor and Description
MelSpectrum(float sampleRate, int numCoeffs) Instantiates a new MelSpectrum.

Method Summary

Modifier and Type	Method and Description
int	getBinForFreq(double freq)
double	getFreqForBin(int bin)
void	process(TimeStamp startTime, TimeStamp endTime, float[] powerSpectrum) Process some data of type P (specified by the class def).
void	setNumberOfFeatures(int numFeatures) Sets the number of features.

Methods inherited from class net.beadsproject.beads.analysis.FeatureExtractor

addListener, forward, getFeatureDescriptions, getFeatures, getName, getNumberOfFeatures, removeListener, setName

Methods inherited from class net.beadsproject.beads.core.Bead

getKillListener, isDeleted, isPaused, kill, message, messageReceived, pause, setKillListener, start, toString

Methods inherited from class java.lang.Object

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

Field Detail

LOG10

public static final float LOG10

Constructor Detail

MelSpectrum

public MelSpectrum(float sampleRate,
                   int numCoeffs)

Instantiates a new MelSpectrum.

Parameters:

sampleRate - the sample rate in samples per second.

numCoeffs - the number of filters to use (number of features).

Method Detail

process

public void process(TimeStamp startTime,
                    TimeStamp endTime,
                    float[] powerSpectrum)

Description copied from class: FeatureExtractor

Process some data of type P (specified by the class def). This method must be overidden by implementing classes.

Specified by:

process in class FeatureExtractor<float[],float[]>

powerSpectrum - the data.

setNumberOfFeatures

public void setNumberOfFeatures(int numFeatures)

Description copied from class: FeatureExtractor

Sets the number of features.

Overrides:

setNumberOfFeatures in class FeatureExtractor<float[],float[]>

Parameters:

numFeatures - the new number of features.

getFreqForBin

public double getFreqForBin(int bin)

getBinForFreq

public int getBinForFreq(double freq)