jAudioFeatureExtractor.AudioFeatures
クラス Derivative

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.Derivative

public class Derivative
extends MetaFeatureFactory

Class implementing the most basic discrete derivative of a dependant feature. Extends the MetaFeatureFactory abstract class.

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
Derivative()
          Basic constructor that initializes the metaFeature class variables appropiaretely for factory use
Derivative(MetaFeatureFactory mff)
          A convenience consrtuctor that extends the basic constructor to allow specifying a dependant MetaFeatureFactory object.
 
メソッドの概要
 java.lang.Object clone()
          Create an identical copy of this feature.
 MetaFeatureFactory defineFeature(FeatureExtractor fe)
          Factory class for creating a new FeatureExtraction object.
 double[] extractFeature(double[] samples, double sampling_rate, double[][] other_feature_values)
          Extracts the difference between adjacent points as a basic implementation of a discrete dirivative.
 java.lang.String getElement(int index)
          Function permitting an unintelligent outside function (ie.
 FeatureDefinition getFeatureDefinition()
          Overridden to regenerate the feature definition.
 void setElement(int index, java.lang.String value)
          Function permitting an unintelligent outside function (ie.
 
クラス jAudioFeatureExtractor.AudioFeatures.MetaFeatureFactory から継承されたメソッド
chainMetaFeatureFactory, setParent, setWindow
 
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

Derivative

public Derivative()
Basic constructor that initializes the metaFeature class variables appropiaretely for factory use


Derivative

public Derivative(MetaFeatureFactory mff)
A convenience consrtuctor that extends the basic constructor to allow specifying a dependant MetaFeatureFactory object.

パラメータ:
mff - dependant MetaFeatureFactory object
メソッドの詳細

defineFeature

public MetaFeatureFactory defineFeature(FeatureExtractor fe)
Factory class for creating a new FeatureExtraction object. Recursively constructs the new object if there exists a dependant MetaFeatureFactory object.

定義:
クラス MetaFeatureFactory 内の defineFeature
パラメータ:
fe - base feature that this feature is to be bvased upon.
戻り値:
fully constructed MetaFeatureFactory object ready for feature extraction.

extractFeature

public double[] extractFeature(double[] samples,
                               double sampling_rate,
                               double[][] other_feature_values)
                        throws java.lang.Exception
Extracts the difference between adjacent points as a basic implementation of a discrete dirivative.

定義:
クラス FeatureExtractor 内の extractFeature
パラメータ:
samples - signal to be analyzed. Not used by this feature
sampling_rate - sampling rate of the signal. Not used by this feature
other_feature_values - provides most recent and next most recent values to be compared
戻り値:
discrete derivative of the underlying feature
例外:
java.lang.Exception - Throws an informative exception if the feature cannot be calculated.

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.

As a metafeature, recursively calls children for the feature requested.

オーバーライド:
クラス FeatureExtractor 内の getElement
パラメータ:
index - which of AreaMoment's attributes should be edited.
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 set the default values used to popylate the table's entries. Like getElement, the correct index values are inferred from the definition.attributes value.

As a metafeature, recursively calls children to set the feature requested.

オーバーライド:
クラス FeatureExtractor 内の setElement
パラメータ:
index - attribute to be set
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