Android Open Source - audiopulse-androidclient Spectral Windows

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License

The source code is released under:

GNU General Public License

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Java Source Code

/* ===========================================================
 * SanaAudioPulse : a free platform for teleaudiology.
 *              /*w w  w. java2s  .  c  o m*/
 * ===========================================================
 *
 * (C) Copyright 2012, by Sana AudioPulse
 *
 * Project Info:
 *    SanaAudioPulse: http://code.google.com/p/audiopulse/
 *    Sana: http://sana.mit.edu/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * [Android is a trademark of Google Inc.]
 *
 * -----------------
 * SpectralWindows.java
 * -----------------
 * (C) Copyright 2012, by SanaAudioPulse
 *
 * Original Author:  Ikaro Silva
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * Check: http://code.google.com/p/audiopulse/source/list
 */ 

package org.audiopulse.analysis;

//Noinstantiable utility class
public class SpectralWindows {

  private SpectralWindows(){
    //Suppress default constructor for noninstantiability
    throw new AssertionError();
  }
  
  public static double hamming(int n, int N){
    // assert that the absolute value is >= 0
    assert ( n <= N ) : "Window sample: " + n + " is beyond expected window range: "+ N;
    double out=0.54 - 0.46*Math.cos(2*Math.PI*(double)n/(N-1));
    return out;  
  }
}

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