at.tuwien.ifs.feature.extraction.audio
Class FeatureExtractor

java.lang.Object
  at.tuwien.ifs.feature.extraction.audio.FeatureExtractor

public class FeatureExtractor
extends java.lang.Object

Copyright Vienna University of Technology

Version:

$Id: FeatureExtractor.java 167 2010-06-17 10:12:01Z frank $

Author:

Thomas Lidy

Field Summary

private boolean	DEBUG
private static int	N_STATISTICAL_DESCRIPTORS
private int	sampleRate
private int	sampleSizeInBits

Constructor Summary

FeatureExtractor(int sampleRate, int sampleSizeInBits)

Method Summary

private RealMatrixExt	computeRhythmHistogram(RealMatrixExt rhythmPattern)
private RealMatrixExt	computeStatisticalSpectrumDescriptor(org.apache.commons.math.linear.RealMatrix sonogram, int bandLimit)
RealMatrixExt[]	extractFeatureSets(short[] wavesegment, FeatureExtractionOptions opt)
RealMatrixExt[]	extractFeatureSets(short[] waveSegment, FeatureExtractionOptions opt, int fftWindowSize)
private double[]	getStatisticalSpectrumDescriptor(double[] dataRow)

Methods inherited from class java.lang.Object

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

Field Detail

DEBUG

private boolean DEBUG

sampleRate

private int sampleRate

sampleSizeInBits

private int sampleSizeInBits

N_STATISTICAL_DESCRIPTORS

private static int N_STATISTICAL_DESCRIPTORS

Constructor Detail

FeatureExtractor

public FeatureExtractor(int sampleRate,
                        int sampleSizeInBits)

Parameters:

sampleRate - the sample rate

sampleSizeInBits - the sample size in bits

Method Detail

extractFeatureSets

public RealMatrixExt[] extractFeatureSets(short[] wavesegment,
                                          FeatureExtractionOptions opt)

Parameters:

wavesegment - audio data

opt - Feature Extraction Options fftWindowSize size of window for FFT calculation will be determined from sampleRate

Returns:

RealMatrixExt array containing one RealMatrixExt for each feature set extracted

extractFeatureSets

public RealMatrixExt[] extractFeatureSets(short[] waveSegment,
                                          FeatureExtractionOptions opt,
                                          int fftWindowSize)

Parameters:

waveSegment - audio data

opt - Feature Extraction Options

fftWindowSize - size of window for FFT calculation

Returns:

RealMatrixExt array containing one RealMatrixExt for each feature set extracted

computeRhythmHistogram

private RealMatrixExt computeRhythmHistogram(RealMatrixExt rhythmPattern)

computeStatisticalSpectrumDescriptor

private RealMatrixExt computeStatisticalSpectrumDescriptor(org.apache.commons.math.linear.RealMatrix sonogram,
                                                           int bandLimit)

getStatisticalSpectrumDescriptor

private double[] getStatisticalSpectrumDescriptor(double[] dataRow)