jAudioFeatureExtractor.AudioFeatures
Class AreaPolynomialApproximationConstantQMFCC

java.lang.Object
  extended by jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
      extended by jAudioFeatureExtractor.AudioFeatures.AreaPolynomialApproximationConstantQMFCC

public class AreaPolynomialApproximationConstantQMFCC
extends FeatureExtractor

2D Polynomial Approximation Feature Creates a set of polynomial factors for a 2D polynomial of order k*l where k is the number of terms in the x direction and l is the number of terms in the y direction. The source is a square matrix of DSP data of some sort. (This version is over FFT data.) The output is a vector of the coeffecients of the polynomial that best fits this data.

Author:
Daniel McEnnis

Field Summary
 
Fields inherited from class jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
definition, dependencies, offsets, parent
 
Constructor Summary
AreaPolynomialApproximationConstantQMFCC()
          Constructor that sets description, dependencies, and offsets from FeatureExtractor
 
Method Summary
 java.lang.Object clone()
          Create an identical copy of this feature.
 double[] extractFeature(double[] samples, double sampling_rate, double[][] other_feature_values)
          Calculates based on windows of magnitude spectrum.
 java.lang.String getElement(int index)
          Function permitting an unintelligent outside function (ie.
 void setElement(int index, java.lang.String value)
          Function permitting an unintelligent outside function (i.e.
 void setWindow(int n)
          Function that must be overridden to allow this feature to be set globally by GlobalChange frame.
 
Methods inherited from class jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
getDepenedencies, getDepenedencyOffsets, getFeatureDefinition, setParent
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

AreaPolynomialApproximationConstantQMFCC

public AreaPolynomialApproximationConstantQMFCC()
Constructor that sets description, dependencies, and offsets from FeatureExtractor

Method Detail

extractFeature

public double[] extractFeature(double[] samples,
                               double sampling_rate,
                               double[][] other_feature_values)
                        throws java.lang.Exception
Calculates based on windows of magnitude spectrum. Encompasses portion of Moments class, but has a delay of lengthOfWindow windows before any results are calculated.

Specified by:
extractFeature in class FeatureExtractor
Parameters:
samples - The samples to extract the feature from.
sampling_rate - The sampling rate that the samples are encoded with.
other_feature_values - The values of other features that are needed to calculate this value. The order and offsets of these features must be the same as those returned by this class's getDependencies and getDependencyOffsets methods respectively. The first indice indicates the feature/window and the second indicates the value.
Returns:
The extracted feature value(s).
Throws:
java.lang.Exception - Throws an informative exception if the feature cannot be calculated.

setWindow

public void setWindow(int n)
               throws java.lang.Exception
Function that must be overridden to allow this feature to be set globally by GlobalChange frame.

Overrides:
setWindow in class FeatureExtractor
Parameters:
n - the number of windows of offset to be used in calculating this feature
Throws:
java.lang.Exception

getElement

public java.lang.String getElement(int index)
                            throws java.lang.Exception
Function permitting an unintelligent outside function (ie. EditFeatures frame) to get the default values used to populate the table's entries. The correct index values are inferred from definition.attribute value.

Overrides:
getElement in class FeatureExtractor
Parameters:
index - which of AreaMoment's attributes should be edited.
Throws:
java.lang.Exception

setElement

public void setElement(int index,
                       java.lang.String value)
                throws java.lang.Exception
Function permitting an unintelligent outside function (i.e. EditFeatures frame) to set the default values used to populate the table's entries. Like getElement, the correct index values are inferred from the definition.attributes value.

Overrides:
setElement in class FeatureExtractor
Parameters:
index - attribute to be set
value - new value of the attribute
Throws:
java.lang.Exception

clone

public java.lang.Object clone()
Create an identical copy of this feature. This permits FeatureExtractor to use the prototype pattern to create new composite features using metafeatures.

Specified by:
clone in class FeatureExtractor