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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 |
java.lang.ObjectjAudioFeatureExtractor.AudioFeatures.FeatureExtractor
jAudioFeatureExtractor.AudioFeatures.BeatHistogram
public class BeatHistogram
A feature extractor that extracts the Beat Histogram from a signal. This is histogram showing the strength of different rhythmic periodicities in a signal.
This is calculated by taking the RMS of 256 windows and then taking the FFT of the result.
No extracted feature values are stored in objects of this class.
IMPORTANT:
The window size of 256 RMS windows used here is hard-coded into the class BeatHistogramLabels. Any changes to the window size in this class must be made there as well.Daniel McEnnis 05-07-05 Added setElement, getElement, setElement, and clone functions
フィールドの概要 |
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クラス jAudioFeatureExtractor.AudioFeatures.FeatureExtractor から継承されたフィールド |
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definition, dependencies, offsets, parent |
コンストラクタの概要 | |
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BeatHistogram()
Basic constructor that sets the definition and dependencies (and their offsets) of this feature. |
メソッドの概要 | |
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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 |
setElement(int index,
java.lang.String value)
Function permitting an unintelligent outside function (i.e. |
void |
setWindowLength(int n)
Helper function to set window length for this feature. |
クラス jAudioFeatureExtractor.AudioFeatures.FeatureExtractor から継承されたメソッド |
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getDepenedencies, getDepenedencyOffsets, getFeatureDefinition, setParent, setWindow |
クラス java.lang.Object から継承されたメソッド |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
コンストラクタの詳細 |
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public BeatHistogram()
メソッドの詳細 |
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public double[] extractFeature(double[] samples, double sampling_rate, double[][] other_feature_values) throws java.lang.Exception
In the case of this feature the sampling_rate is ignored.
FeatureExtractor
内の extractFeature
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 index
indicates the feature/window and the second indicates the
value.
java.lang.Exception
- Throws an informative exception if the feature cannot be
calculated.public void setWindowLength(int n) throws java.lang.Exception
n
- new number of beat bins
java.lang.Exception
- thrown if the new value is less than 2public java.lang.String getElement(int index) throws java.lang.Exception
FeatureExtractor
内の getElement
index
- which of Beat Histograms's attributes should be edited.
java.lang.Exception
public void setElement(int index, java.lang.String value) throws java.lang.Exception
FeatureExtractor
内の setElement
index
- attribute to be setvalue
- new value of the attribute
java.lang.Exception
public java.lang.Object clone()
FeatureExtractor
内の clone
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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 |