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## jAudioFeatureExtractor.AudioFeatures
クラス PeakFinder

    java.lang.Object
      jAudioFeatureExtractor.AudioFeatures.FeatureExtractor
          jAudioFeatureExtractor.AudioFeatures.PeakFinder

    public class PeakFinder

extends FeatureExtractor

Implements a very basic peak detection algorithm. Peaks are calculated by finding local maximum in the values of the frequency bins. All maxima within a threshold of the largest value is considered a peak. The thresholds of all peaks are provided in order without its bin location in the original signal.

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
`PeakFinder()` 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 a set of peaks from this window.
`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 (ie.
`void` | `setPeakThreshold(int peak)` Sets the minumum fraction of the max point that will register as a peak.

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`

コンストラクタの詳細

### PeakFinder

    public PeakFinder()

  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 a set of peaks from this window.

  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.

### 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`

### setPeakThreshold

    public void setPeakThreshold(int peak)
                          throws java.lang.Exception

  Sets the minumum fraction of the max point that will register as a peak. The value is interpreted as 1/N of the maximum.

  パラメータ:
    `peak` - sets 1/N as threshold for peak detection.
  例外:
    `java.lang.Exception` - thrown if a non-positive threshold is set.

### 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`

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