Package com.musicg.wave.extension

Class Spectrogram

java.lang.Object

com.musicg.wave.extension.Spectrogram

public class Spectrogram
extends java.lang.Object

Handles the wave data in frequency-time domain.

Author:

Jacquet Wong

Field Summary

Fields

Modifier and Type	Field	Description
static int	SPECTROGRAM_DEFAULT_FFT_SAMPLE_SIZE
static int	SPECTROGRAM_DEFAULT_OVERLAP_FACTOR

Constructor Summary

Constructors

Constructor	Description
Spectrogram(Wave wave)	Constructor
Spectrogram(Wave wave, int fftSampleSize, int overlapFactor)	Constructor

Method Summary

Modifier and Type	Method	Description
double[][]	getAbsoluteSpectrogramData()	Get spectrogram: spectrogram[time][frequency]=intensity
int	getFftSampleSize()
int	getFramesPerSecond()
double[][]	getNormalizedSpectrogramData()	Get spectrogram: spectrogram[time][frequency]=intensity
int	getNumFrames()
int	getNumFrequencyUnit()
int	getOverlapFactor()
double	getUnitFrequency()

Methods inherited from class java.lang.Object

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

Field Detail

SPECTROGRAM_DEFAULT_FFT_SAMPLE_SIZE

public static final int SPECTROGRAM_DEFAULT_FFT_SAMPLE_SIZE

See Also:

Constant Field Values

SPECTROGRAM_DEFAULT_OVERLAP_FACTOR

public static final int SPECTROGRAM_DEFAULT_OVERLAP_FACTOR

See Also:

Constant Field Values

Constructor Detail

Spectrogram

public Spectrogram(Wave wave)

Constructor

Parameters:

wave -

Spectrogram

public Spectrogram(Wave wave,
                   int fftSampleSize,
                   int overlapFactor)

Constructor

Parameters:

wave -

fftSampleSize - number of sample in fft, the value needed to be a number to power of 2

overlapFactor - 1/overlapFactor overlapping, e.g. 1/4=25% overlapping, 0 for no overlapping

Method Detail

getNormalizedSpectrogramData

public double[][] getNormalizedSpectrogramData()

Get spectrogram: spectrogram[time][frequency]=intensity

Returns:

logarithm normalized spectrogram

getAbsoluteSpectrogramData

public double[][] getAbsoluteSpectrogramData()

Get spectrogram: spectrogram[time][frequency]=intensity

Returns:

absolute spectrogram

getNumFrames

public int getNumFrames()

getFramesPerSecond

public int getFramesPerSecond()

getNumFrequencyUnit

public int getNumFrequencyUnit()

getUnitFrequency

public double getUnitFrequency()

getFftSampleSize

public int getFftSampleSize()

getOverlapFactor

public int getOverlapFactor()