Spectrogram
Class WindowFunction

java.lang.Object
  Spectrogram.WindowFunction

public class WindowFunction
extends java.lang.Object

Window function for use with FFT.

Author:

Douglas Gillespie

Field Summary

static int	BARTLETT
static int	BLACKMAN
static int	BLACKMANHARRIS
static int	HAMMING
static int	HANNING
private static java.lang.String[]	names
static int	NWINDOWS
static int	RECTANGULAR

Constructor Summary

WindowFunction()

Method Summary

static double[]	bartlett(int length)
static double[]	blackman(int length)
static double[]	blackmanharris(int length)
static java.lang.String[]	getNames()
static double[]	getWindowFunc(int windowType, int length)
static double	getWindowGain(double[] windowFunction) Calculate the gain of the window function
static double[]	hamming(int length)
static double[]	hanning(int length)
static double[]	rectangular(int length)

Methods inherited from class java.lang.Object

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

Field Detail

RECTANGULAR

public static final int RECTANGULAR

See Also:

Constant Field Values

HAMMING

public static final int HAMMING

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Constant Field Values

HANNING

public static final int HANNING

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Constant Field Values

BARTLETT

public static final int BARTLETT

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Constant Field Values

BLACKMAN

public static final int BLACKMAN

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Constant Field Values

BLACKMANHARRIS

public static final int BLACKMANHARRIS

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Constant Field Values

NWINDOWS

public static final int NWINDOWS

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Constant Field Values

names

private static java.lang.String[] names

Constructor Detail

WindowFunction

public WindowFunction()

Method Detail

getNames

public static java.lang.String[] getNames()

getWindowFunc

public static double[] getWindowFunc(int windowType,
                                     int length)

hamming

public static double[] hamming(int length)

hanning

public static double[] hanning(int length)

rectangular

public static double[] rectangular(int length)

bartlett

public static double[] bartlett(int length)

blackman

public static double[] blackman(int length)

blackmanharris

public static double[] blackmanharris(int length)

getWindowGain

public static double getWindowGain(double[] windowFunction)

Calculate the gain of the window function

Parameters:

windowFunction - window function array

Returns:

window rms gain as a factor (NOT dB);