/*
* KaiserWindow.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 2002 by Matthias Pfisterer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
|<--- this code is formatted to fit into 80 columns --->|
*/
package org.tritonus.lowlevel.dsp;
/** An implementation of the Kaiser window.
*/
public class KaiserWindow
implements Window
{
/** The alpha parameter of the Kaiser window.
*/
private double m_dAlpha;
/** Constructor taking alpha.
@param dAlpha The alpha parameter of the Kaiser window.
*/
public KaiserWindow(double dAlpha)
{
m_dAlpha = dAlpha;
}
/** Returns alpha.
@return alpha.
*/
public double getAlpha()
{
return m_dAlpha;
}
/** Get an array containing the window coefficients.
@param nOrder The number of elements that the returned
array should have.
*/
public double[] getWindow(int nOrder)
{
double[] adWindow = new double[nOrder];
for (int n = 0; n < nOrder; n++)
{
adWindow[n] = Util.I0(getAlpha() * Math.sqrt(n * (2.0 * nOrder - n)) / nOrder) / Util.I0(getAlpha());
}
return adWindow;
}
}
/*** KaiserWindow.java ***/