jAudioFeatureExtractor.AudioFeatures
クラス RelativeDifferenceFunction

java.lang.Object
  上位を拡張 jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
      上位を拡張 jAudioFeatureExtractor.AudioFeatures.RelativeDifferenceFunction

public class RelativeDifferenceFunction
extends FeatureExtractor

This feature calculates the log of the derivative of the RMS. This is useful for onset detection.

作成者:
Daniel McEnnis

フィールドの概要
 
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
RelativeDifferenceFunction()
          Basic constructor that sets the definition and dependencies (and their offsets) of this feature.
 
メソッドの概要
 java.lang.Object clone()
          Create an identical copy of this feature.
 double[] extractFeature(double[] samples, double sampling_rate, double[][] other_feature_values)
          Calculates the log ofthe derivative of the RMS from the last 2 versions of RMS
 
クラス jAudioFeatureExtractor.AudioFeatures.FeatureExtractor から継承されたメソッド
getDepenedencies, getDepenedencyOffsets, getElement, getFeatureDefinition, setElement, setParent, setWindow
 
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

RelativeDifferenceFunction

public RelativeDifferenceFunction()
Basic constructor that sets the definition and dependencies (and their offsets) of this feature.

メソッドの詳細

extractFeature

public double[] extractFeature(double[] samples,
                               double sampling_rate,
                               double[][] other_feature_values)
                        throws java.lang.Exception
Calculates the log ofthe derivative of the RMS from the last 2 versions of RMS

定義:
クラス FeatureExtractor 内の extractFeature
パラメータ:
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.
戻り値:
The extracted feature value(s).
例外:
java.lang.Exception - Throws an informative exception if the feature cannot be calculated.

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