org.openimaj.audio.features

Class MFCC

java.lang.Object

org.openimaj.audio.Audio

org.openimaj.audio.AudioStream

org.openimaj.audio.processor.AudioProcessor

org.openimaj.audio.features.JAudioFeatureExtractor

org.openimaj.audio.features.MFCC

All Implemented Interfaces:

Iterable<SampleChunk>, FeatureExtractor<DoubleFV,SampleChunk>

public class MFCC
extends JAudioFeatureExtractor

A wrapper around the MFCC implementation of jAudio (which itself is a wrapper around the OrangeCow Volume implementation of FFT).

Version:

$Author$, $Revision$, $Date$

Author:

David Dupplaw (dpd@ecs.soton.ac.uk)

Created:

5 Mar 2013

Field Summary

Fields inherited from class org.openimaj.audio.features.JAudioFeatureExtractor

featureExtractor

Fields inherited from class org.openimaj.audio.Audio

format

Constructor Summary

Constructors

Constructor and Description
MFCC() Default constructor
MFCC(AudioStream as) Constructor for chaining to a stream

Method Summary

Modifier and Type	Method and Description
double[][]	calculateMFCC(SampleBuffer sb) Calculate the MFCCs for the given sample buffer.
double[][]	getExtraInputs(double[] samples, double sampleRate) Returns the extra inputs required by a specific feature extractor
double[][]	getLastCalculatedFeatureWithoutFirst() Returns the MFCCs with the first coefficient set to zero.

Methods inherited from class org.openimaj.audio.features.JAudioFeatureExtractor

extractFeature, getLastCalculatedFeature, process, process, process, process, setLastCalculatedFeature

Methods inherited from class org.openimaj.audio.processor.AudioProcessor

getLength, getUnderlyingStream, nextSampleChunk, process, processingComplete, reset, setUnderlyingStream

Methods inherited from class org.openimaj.audio.AudioStream

iterator, seek

Methods inherited from class org.openimaj.audio.Audio

getFormat, setFormat

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

MFCC

public MFCC()

Default constructor

MFCC

public MFCC(AudioStream as)

Constructor for chaining to a stream

Parameters:

as - The audio stream

Method Detail

calculateMFCC

public double[][] calculateMFCC(SampleBuffer sb)

Calculate the MFCCs for the given sample buffer.

Parameters:

sb - The sample buffer

Returns:

The MFCCs

getExtraInputs

public double[][] getExtraInputs(double[] samples,
                                 double sampleRate)

Returns the extra inputs required by a specific feature extractor

Specified by:

getExtraInputs in class JAudioFeatureExtractor

Parameters:

samples - The samples for a single channel

sampleRate - The sample rate of the data

Returns:

The extra input

See Also:

JAudioFeatureExtractor.getExtraInputs(double[], double)

getLastCalculatedFeatureWithoutFirst

public double[][] getLastCalculatedFeatureWithoutFirst()

Returns the MFCCs with the first coefficient set to zero.

Returns:

The MFCCs with the first set to zero.