be.tarsos.dsp.onsets

Class ComplexOnsetDetector

java.lang.Object

be.tarsos.dsp.onsets.ComplexOnsetDetector

All Implemented Interfaces:

AudioProcessor, OnsetDetector

public class ComplexOnsetDetector
extends java.lang.Object
implements AudioProcessor, OnsetDetector

A complex Domain Method onset detection function Christopher Duxbury, Mike E. Davies, and Mark B. Sandler. Complex domain onset detection for musical signals. In Proceedings of the Digital Audio Effects Conference, DAFx-03, pages 90-93, London, UK, 2003 The implementation is a translation of onset.c from Aubio, Copyright (C) 2003-2009 Paul Brossier

Author:

Joren Six, Paul Brossiers

Constructor Summary

Constructors

Constructor and Description
ComplexOnsetDetector(int fftSize)
ComplexOnsetDetector(int fftSize, double peakThreshold)
ComplexOnsetDetector(int fftSize, double peakThreshold, double minimumInterOnsetInterval)
ComplexOnsetDetector(int fftSize, double peakThreshold, double minimumInterOnsetInterval, double silenceThreshold)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	process(AudioEvent audioEvent) Process the audio event.
void	processingFinished() Notify the AudioProcessor that no more data is available and processing has finished.
void	setHandler(OnsetHandler handler)
void	setThreshold(double threshold)

Methods inherited from class java.lang.Object

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

Constructor Detail

ComplexOnsetDetector

public ComplexOnsetDetector(int fftSize,
                    double peakThreshold,
                    double minimumInterOnsetInterval,
                    double silenceThreshold)

Parameters:

fftSize - The size of the fft to take (e.g. 512)

peakThreshold - A threshold used for peak picking. Values between 0.1 and 0.8. Default is 0.3, if too many onsets are detected adjust to 0.4 or 0.5.

silenceThreshold - The threshold that defines when a buffer is silent. Default is -70dBSPL. -90 is also used.

minimumInterOnsetInterval - The minimum inter-onset-interval in seconds. When two onsets are detected within this interval the last one does not count. Default is 0.004 seconds.

ComplexOnsetDetector

public ComplexOnsetDetector(int fftSize)

ComplexOnsetDetector

public ComplexOnsetDetector(int fftSize,
                    double peakThreshold)

ComplexOnsetDetector

public ComplexOnsetDetector(int fftSize,
                    double peakThreshold,
                    double minimumInterOnsetInterval)

Method Detail

process

public boolean process(AudioEvent audioEvent)

Description copied from interface: AudioProcessor

Process the audio event. Do the actual signal processing on an (optionally) overlapping buffer.

Specified by:

process in interface AudioProcessor

Parameters:

audioEvent - The audio event that contains audio data.

Returns:

False if the chain needs to stop here, true otherwise. This can be used to implement e.g. a silence detector.

setHandler

public void setHandler(OnsetHandler handler)

Specified by:

setHandler in interface OnsetDetector

setThreshold

public void setThreshold(double threshold)

processingFinished

public void processingFinished()

Description copied from interface: AudioProcessor

Notify the AudioProcessor that no more data is available and processing has finished. Can be used to deallocate resources or cleanup.

Specified by:

processingFinished in interface AudioProcessor