marytts.signalproc.analysis
Class ShortTermLogSpectrumAnalyser

java.lang.Object
  marytts.signalproc.process.FrameProvider
      marytts.signalproc.analysis.FrameBasedAnalyser
          marytts.signalproc.analysis.ShortTermSpectrumAnalyser
              marytts.signalproc.analysis.ShortTermLogSpectrumAnalyser

public class ShortTermLogSpectrumAnalyser
extends ShortTermSpectrumAnalyser

Author:

Marc Schröder Implements a frame based log 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.ShortTermSpectrumAnalyser

real

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

ShortTermLogSpectrumAnalyser(DoubleDataSource signal, int fftSize, Window window, int frameShift, int samplingRate)
Initialise a FrameBasedAnalyser.

Method Summary

java.lang.Object

analyse(double[] frame) Apply this FrameBasedAnalyser to the given data.

Methods inherited from class marytts.signalproc.analysis.ShortTermSpectrumAnalyser

getFFTWindowLength, getFrequencyResolution

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

ShortTermLogSpectrumAnalyser

public ShortTermLogSpectrumAnalyser(DoubleDataSource signal,
                                    int fftSize,
                                    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

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:

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

Method Detail

analyse

public java.lang.Object analyse(double[] frame)

Apply this FrameBasedAnalyser to the given data.

Overrides:

analyse in class ShortTermSpectrumAnalyser

Parameters:

frame - the data to analyse, which must be of the length prescribed by this FrameBasedAnalyser, i.e. by @see{#getFrameLengthSamples()}.

Returns:

a double array of half the frame length

Throws:

java.lang.IllegalArgumentException - if frame does not have the prescribed length