net.beadsproject.beads.analysis.featureextractors

Class PeakDetector

java.lang.Object

net.beadsproject.beads.core.Bead

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

net.beadsproject.beads.analysis.featureextractors.PeakDetector

All Implemented Interfaces:

SegmentMaker

public class PeakDetector
extends FeatureExtractor<java.lang.Float,java.lang.Float>
implements SegmentMaker

Detects peaks in a continuous stream of one element inputs. Attach to an OnsetDetectionFunction (like SpectralDifference) to get Onsets. Use addMessageListener to receive a message when an onset is detected. The algorithm follows the one described in: Dixon, S (2006) "Onset Detection Revisited" Proc. of the 9th Int. Conference on Digital Audio Effects (DAFx-06), Montreal, Canada, September 18-20, 2006

Author:

ben

Field Summary

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

featureDescriptions, features, name, numFeatures

Constructor Summary

Constructors

Constructor and Description
PeakDetector()

Method Summary

Modifier and Type	Method and Description
void	addMessageListener(Bead b)
void	addSegmentListener(SegmentListener sl) Adds the SegmentListener.
int	getBufferSize() Get the correct BufferSize for the OnsetDetector
int	getLagInFrames()
float	getLastOnsetValue()
void	process(TimeStamp startTime, TimeStamp endTime, java.lang.Float input) process: assumes input is a 1 element array
void	removeMessageListener(Bead b)
void	removeSegmentListener(SegmentListener sl) Removes the SegmentListener.
void	setAlpha(float alpha)
void	setFilter(Buffer b) Sets the window for the local averaging.
void	setResetDelay(float resetDelay)
void	setThreshold(float thresh)

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

PeakDetector

public PeakDetector()

Method Detail

setThreshold

public void setThreshold(float thresh)

setAlpha

public void setAlpha(float alpha)

setResetDelay

public void setResetDelay(float resetDelay)

getLastOnsetValue

public float getLastOnsetValue()

Returns:

the value at the last onset

getLagInFrames

public int getLagInFrames()

Returns:

The lag in frames between onsets occurring and actually being detected

getBufferSize

public int getBufferSize()

Get the correct BufferSize for the OnsetDetector

setFilter

public void setFilter(Buffer b)

Sets the window for the local averaging.

Parameters:

b - Buffer must be of size == getBufferSize(), and integrates to 1.

process

public void process(TimeStamp startTime,
                    TimeStamp endTime,
                    java.lang.Float input)

process: assumes input is a 1 element array

Specified by:

process in class FeatureExtractor<java.lang.Float,java.lang.Float>

input - the data.

addMessageListener

public void addMessageListener(Bead b)

removeMessageListener

public void removeMessageListener(Bead b)

addSegmentListener

public void addSegmentListener(SegmentListener sl)

Description copied from interface: SegmentMaker

Adds the SegmentListener.

Specified by:

addSegmentListener in interface SegmentMaker

Parameters:

sl - the segment listener.

removeSegmentListener

public void removeSegmentListener(SegmentListener sl)

Description copied from interface: SegmentMaker

Removes the SegmentListener.

Specified by:

removeSegmentListener in interface SegmentMaker

Parameters:

sl - the segment listener.