net.beadsproject.beads.analysis.featureextractors

Class SpectralDifference

java.lang.Object

net.beadsproject.beads.core.Bead

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

net.beadsproject.beads.analysis.featureextractors.SpectralDifference

public class SpectralDifference
extends FeatureExtractor<java.lang.Float,float[]>

SpectralDifference calculates the spectral difference between one frame and the next.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SpectralDifference.DifferenceType

Field Summary

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

featureDescriptions, features, name, numFeatures

Constructor Summary

Constructors

Constructor and Description
SpectralDifference(float samplerate) Create a spectral difference feature extractor of the entire spectrum.
SpectralDifference(float samplerate, float minf, float maxf) Create a spectral difference feature extractor with a specific frequency window.

Method Summary

Modifier and Type	Method and Description
void	process(TimeStamp startTime, TimeStamp endTime, float[] spectrum) Process some data of type P (specified by the class def).
void	setDifferenceType(SpectralDifference.DifferenceType dt)
void	setFreqWindow(float minf, float maxf) Specify a window of the spectrum to analyse.

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

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

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

Constructor Detail

SpectralDifference

public SpectralDifference(float samplerate)

Create a spectral difference feature extractor of the entire spectrum.

Parameters:

samplerate - The sample rate of the AudioContext

SpectralDifference

public SpectralDifference(float samplerate,
                          float minf,
                          float maxf)

Create a spectral difference feature extractor with a specific frequency window.

Parameters:

samplerate - The sample rate of the AudioContext

minf - The lower frequency of the window

maxf - The upper frequency of the window

Method Detail

setFreqWindow

public void setFreqWindow(float minf,
                          float maxf)

Specify a window of the spectrum to analyse. By default the entire spectrum is analysed.

Parameters:

minf - The lower frequency

maxf - The upper frequency

setDifferenceType

public void setDifferenceType(SpectralDifference.DifferenceType dt)

process

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

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<java.lang.Float,float[]>

spectrum - the data.