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## jAudioFeatureExtractor.AudioFeatures
クラス SpectralRolloffPoint

    java.lang.Object
      jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
          jAudioFeatureExtractor.AudioFeatures.SpectralRolloffPoint

    public class SpectralRolloffPoint

extends FeatureExtractor

A feature extractor that extracts the Spectral Rolloff Point. This is a measure measure of the amount of the right-skewedness of the power spectrum.

The spectral rolloff point is the fraction of bins in the power spectrum at which 85% of the power is at lower frequencies.

No extracted feature values are stored in objects of this class.

作成者:
  Cory McKay

フィールドの概要
`protected double` | `cutoff`

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
`SpectralRolloffPoint()` 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)` Extracts this feature from the given samples at the given sampling rate and given the other feature values.
`java.lang.String` | `getElement(int index)` Function permitting an unintelligent outside function (ie.
`void` | `setCutoff(double c)` Permits users to set the rpecise cutoff point.
`void` | `setElement(int index, java.lang.String value)` Function permitting an unintelligent outside function (ie.

クラス jAudioFeatureExtractor.AudioFeatures.FeatureExtractor から継承されたメソッド
`getDepenedencies, getDepenedencyOffsets, getFeatureDefinition, 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`

フィールドの詳細

### cutoff

    protected double cutoff

コンストラクタの詳細

### SpectralRolloffPoint

    public SpectralRolloffPoint()

  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

  Extracts this feature from the given samples at the given sampling rate and given the other feature values.

  In the case of this feature, the sampling_rate parameter is ignored.

  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`

### 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.

  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.

  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`

### setCutoff

    public void setCutoff(double c)
                   throws java.lang.Exception

  Permits users to set the rpecise cutoff point. THis value should be strictly between 0 and 1.

  パラメータ:
    `c` - new cutoff point
  例外:
    `java.lang.Exception` - thrown if c is not a real number strictly between 0 and 1.

概要 | パッケージ | クラス | 階層ツリー | 非推奨 API | 索引 | ヘルプ
前のクラス 次のクラス | フレームあり フレームなし
概要: 入れ子 | フィールド | コンストラクタ | メソッド | 詳細: フィールド | コンストラクタ | メソッド