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java.lang.ObjectjAudioFeatureExtractor.AudioFeatures.FeatureExtractor
jAudioFeatureExtractor.AudioFeatures.PeakFinder
public class PeakFinder
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.
Field Summary |
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Fields inherited from class jAudioFeatureExtractor.AudioFeatures.FeatureExtractor |
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definition, dependencies, offsets, parent |
Constructor Summary | |
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PeakFinder()
Basic constructor that sets the definition and dependencies (and their offsets) of this feature. |
Method Summary | |
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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 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. |
Methods inherited from class jAudioFeatureExtractor.AudioFeatures.FeatureExtractor |
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getDepenedencies, getDepenedencyOffsets, getFeatureDefinition, setParent, setWindow |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public PeakFinder()
Method Detail |
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public double[] extractFeature(double[] samples, double sampling_rate, double[][] other_feature_values) throws java.lang.Exception
extractFeature
in class FeatureExtractor
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.
java.lang.Exception
- Throws an informative exception if
the feature cannot be calculated.public java.lang.String getElement(int index) throws java.lang.Exception
As a metafeature, recursively calls children for the feature requested.
getElement
in class FeatureExtractor
index
- which of AreaMoment's attributes should be edited.
java.lang.Exception
public void setPeakThreshold(int peak) throws java.lang.Exception
peak
- sets 1/N as threshold for peak detection.
java.lang.Exception
- thrown if a non-positive threshold is set.public void setElement(int index, java.lang.String value) throws java.lang.Exception
As a metafeature, recursively calls children to set the feature requested.
setElement
in class FeatureExtractor
index
- attribute to be setvalue
- new value of the attribute
java.lang.Exception
public java.lang.Object clone()
clone
in class FeatureExtractor
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