jAudioFeatureExtractor.AudioFeatures
クラス StandardDeviation

java.lang.Object
  上位を拡張 jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
      上位を拡張 jAudioFeatureExtractor.AudioFeatures.MetaFeatureFactory
          上位を拡張 jAudioFeatureExtractor.AudioFeatures.StandardDeviation

public class StandardDeviation
extends MetaFeatureFactory

Calculates the Standard Deviation of a feature over a large running window.

作成者:
Daniel McEnnis

フィールドの概要
 
クラス jAudioFeatureExtractor.AudioFeatures.MetaFeatureFactory から継承されたフィールド
fe_
 
クラス jAudioFeatureExtractor.AudioFeatures.FeatureExtractor から継承されたフィールド
definition, dependencies, offsets, parent
 
コンストラクタの概要
StandardDeviation()
          Basic constructor that initializes the metafeautres values properly for use as a factory.
StandardDeviation(MetaFeatureFactory mff)
          Convenience constructor to create a new factory object with the given dependant metafeature
 
メソッドの概要
 java.lang.Object clone()
          Create an identical copy of this feature.
 MetaFeatureFactory defineFeature(FeatureExtractor fe)
          Factory method for this class which generates a fully usable MetaFeature object.
 double[] extractFeature(double[] samples, double sampling_rate, double[][] other_feature_values)
          Calculates the standard deviation over last 100 windows
 java.lang.String getElement(int index)
          Function that must be overridden to allow this feature to be set globally by GlobalChange frame.
 FeatureDefinition getFeatureDefinition()
          Overridden to regenerate the feature definition.
 void setElement(int index, java.lang.String value)
          Function permitting an unintelligent outside function (ie.
 void setWindow(int n)
          Function permits this class to respond to a global window change request.
 
クラス jAudioFeatureExtractor.AudioFeatures.MetaFeatureFactory から継承されたメソッド
chainMetaFeatureFactory, setParent
 
クラス jAudioFeatureExtractor.AudioFeatures.FeatureExtractor から継承されたメソッド
getDepenedencies, getDepenedencyOffsets
 
クラス java.lang.Object から継承されたメソッド
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

コンストラクタの詳細

StandardDeviation

public StandardDeviation()
Basic constructor that initializes the metafeautres values properly for use as a factory.


StandardDeviation

public StandardDeviation(MetaFeatureFactory mff)
Convenience constructor to create a new factory object with the given dependant metafeature

パラメータ:
mff - metafeature factory that this newly created object should depend upon.
メソッドの詳細

defineFeature

public MetaFeatureFactory defineFeature(FeatureExtractor fe)
Factory method for this class which generates a fully usable MetaFeature object. Using the structure stored in this Mean object, create a new FeatureExtractor with the given specific FeatureExtraction as a base. If we are calulating the mean of another meta-feature, recursively create the underlying meta feature first.

定義:
クラス MetaFeatureFactory 内の defineFeature
パラメータ:
fe - Feature to be used as base for feature extraction
戻り値:
completed metafeature.

extractFeature

public double[] extractFeature(double[] samples,
                               double sampling_rate,
                               double[][] other_feature_values)
                        throws java.lang.Exception
Calculates the standard deviation over last 100 windows

定義:
クラス FeatureExtractor 内の extractFeature
パラメータ:
samples - signal being processed
sampling_rate - sample rate of the signal
other_feature_values - dependancies of the current signal
戻り値:
standard deviation over last 100 values of dependant feature.
例外:
java.lang.Exception - Throws an informative exception if the feature cannot be calculated.

setWindow

public void setWindow(int n)
               throws java.lang.Exception
Function permits this class to respond to a global window change request.

オーバーライド:
クラス MetaFeatureFactory 内の setWindow
パラメータ:
n - new window length
例外:
java.lang.Exception - thrown if the new window size is less than 2

getElement

public java.lang.String getElement(int index)
                            throws java.lang.Exception
Function that must be overridden to allow this feature to be set globally by GlobalChange frame.

オーバーライド:
クラス FeatureExtractor 内の getElement
パラメータ:
index - the number of windows of offset to be used in calculating this feature
例外:
java.lang.Exception

setElement

public void setElement(int index,
                       java.lang.String value)
                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.

オーバーライド:
クラス FeatureExtractor 内の setElement
パラメータ:
index - which of AreaMoment's attributes should be edited.
value - new value of the attribute
例外:
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.

定義:
クラス FeatureExtractor 内の clone

getFeatureDefinition

public FeatureDefinition getFeatureDefinition()
Overridden to regenerate the feature definition. Perhaps its should be kept purely virtual, but currently, attributes and dimensions are recalculated for each iteration. This is necessary so that changes in children's defintions get propogated back to the top level. As of 05-08-05 LPC is the only feature that requires this.

オーバーライド:
クラス FeatureExtractor 内の getFeatureDefinition