|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.ObjectjAudioFeatureExtractor.AudioFeatures.FeatureExtractor
jAudioFeatureExtractor.AudioFeatures.SpectralRolloffPoint
public class SpectralRolloffPoint
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.
Field Summary | |
---|---|
protected double |
cutoff
|
Fields inherited from class jAudioFeatureExtractor.AudioFeatures.FeatureExtractor |
---|
definition, dependencies, offsets, parent |
Constructor Summary | |
---|---|
SpectralRolloffPoint()
Basic constructor that sets the definition and dependencies (and their offsets) of this feature. |
Method Summary | |
---|---|
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. |
Methods inherited from class jAudioFeatureExtractor.AudioFeatures.FeatureExtractor |
---|
getDepenedencies, getDepenedencyOffsets, getFeatureDefinition, setParent, setWindow |
Methods inherited from class java.lang.Object |
---|
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
protected double cutoff
Constructor Detail |
---|
public SpectralRolloffPoint()
Method Detail |
---|
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 parameter is ignored.
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.Object clone()
clone
in class FeatureExtractor
public java.lang.String getElement(int index) throws java.lang.Exception
getElement
in class FeatureExtractor
index
- which of AreaMoment's attributes should be edited.
java.lang.Exception
public void setElement(int index, java.lang.String value) throws java.lang.Exception
setElement
in class FeatureExtractor
index
- attribute to be setvalue
- new value of the attribute
java.lang.Exception
public void setCutoff(double c) throws java.lang.Exception
c
- new cutoff point
java.lang.Exception
- thrown if c is not a real number strictly between 0 and 1.
|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |