marytts.signalproc.analysis

Class ShortTermCepstrumAnalyser

java.lang.Object

marytts.signalproc.process.FrameProvider

marytts.signalproc.analysis.FrameBasedAnalyser<double[]>

marytts.signalproc.analysis.ShortTermCepstrumAnalyser

public class ShortTermCepstrumAnalyser
extends FrameBasedAnalyser<double[]>

Author:

Marc Schröder Implements a frame based spectrum analyser

Nested Class Summary

Nested classes/interfaces inherited from class marytts.signalproc.analysis.FrameBasedAnalyser

FrameBasedAnalyser.FrameAnalysisResult<T>

Field Summary

Fields inherited from class marytts.signalproc.analysis.FrameBasedAnalyser

analysisResults

Fields inherited from class marytts.signalproc.process.FrameProvider

frame, frameLength, frameShift, frameStart, nextFrameStart, processor, samplingRate, signal, totalRead, validSamplesInFrame

Constructor Summary

Constructors

Constructor and Description
ShortTermCepstrumAnalyser(DoubleDataSource signal, int fftSize, int invFftSize, Window window, int frameShift, int samplingRate) Initialise a FrameBasedAnalyser.

Method Summary

Methods

Modifier and Type	Method and Description
double[]	analyse(double[] aFrame) Apply this FrameBasedAnalyser to the given data.
int	getFFTWindowLength()
int	getInverseFFTWindowLength()
double	getQuefrencyResolution() The distance of two adjacent points on the quefrency axis, in ms

Methods inherited from class marytts.signalproc.analysis.FrameBasedAnalyser

analyseAllFrames, analyseAvailableFrames, analyseNextFrame, constructAnalysisResult

Methods inherited from class marytts.signalproc.process.FrameProvider

getCurrentFrame, getData, getFrameLengthSamples, getFrameLengthTime, getFrameShiftSamples, getFrameShiftTime, getFrameStartSamples, getFrameStartTime, getNextFrame, getSamplingRate, hasMoreData, main, resetInternalTimer, stopWhenTouchingEnd, validSamplesInFrame

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ShortTermCepstrumAnalyser

public ShortTermCepstrumAnalyser(DoubleDataSource signal,
                         int fftSize,
                         int invFftSize,
                         Window window,
                         int frameShift,
                         int samplingRate)

Initialise a FrameBasedAnalyser.

Parameters:

signal - the signal source to read from

fftSize - the size of the FFT to use

invFftSize - inverted FftSize

window - the window function to apply to each frame

frameShift - the number of samples by which to shift the window from one frame analysis to the next; if this is smaller than window.getLength(), frames will overlap.

samplingRate - the number of samples in one second.

Throws:

IllegalArgumentException - if the window is longer than fftSize, or fftSize is not a power of two.

Method Detail

analyse

public double[] analyse(double[] aFrame)

Apply this FrameBasedAnalyser to the given data.

Specified by:

analyse in class FrameBasedAnalyser<double[]>

Parameters:

aFrame - the data to analyse, which must be of the length prescribed by this FrameBasedAnalyser, i.e. by similar to FrameProvider.getFrameLengthSamples() .

Returns:

a double array of half the frame length

Throws:

IllegalArgumentException - if frame does not have the prescribed length

getQuefrencyResolution

public double getQuefrencyResolution()

The distance of two adjacent points on the quefrency axis, in ms

Returns:

quefrencyResolution

getFFTWindowLength

public int getFFTWindowLength()

getInverseFFTWindowLength

public int getInverseFFTWindowLength()