content: /**
   * Copyright 2007 DFKI GmbH.
   * All Rights Reserved.  Use is subject to license terms.
   * <p/>
   * Permission is hereby granted, free of charge, to use and distribute
   * this software and its documentation without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of this work, and to
   * permit persons to whom this work is furnished to do so, subject to
   * the following conditions:
   * <p/>
   * 1. The code must retain the above copyright notice, this list of
   * conditions and the following disclaimer.
   * 2. Any modifications must be clearly marked as such.
   * 3. Original authors' names are not deleted.
   * 4. The authors' names are not used to endorse or promote products
   * derived from this software without specific prior written
   * permission.
   * <p/>
   * DFKI GMBH AND THE CONTRIBUTORS TO THIS WORK DISCLAIM ALL WARRANTIES WITH
   * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DFKI GMBH NOR THE
   * CONTRIBUTORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
   * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
   * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
   * THIS SOFTWARE.
   */
  
  package marytts.signalproc.window;
  
  /**
   * @author Oytun T&uumlrk
   */
  public class FlattopWindow extends Window {
  
      public FlattopWindow(int length) {
          super(length);
      }
  
      public FlattopWindow(int length, double prescalingFactor) {
          super(length, prescalingFactor);
      }
  
      @Override
      protected void initialise() {
          boolean prescale = (prescalingFactor != 1.);
  
          for (int i = 0; i < window.length; i++) {
              window[i] = 1.0 - 1.93 * Math.cos((2 * Math.PI * i) / (window.length - 1)) + 1.29 * Math.cos((4 * Math.PI * i) / (window.length - 1)) - 0.388 * Math.cos((6 * Math.PI * i) / (window.length - 1)) + 0.032 * Math.cos((8 * Math.PI * i) / (window.length - 1));
              if (prescale)
                  window[i] *= prescalingFactor;
          }
      }
  
      @Override
      public String toString() {
          return "Bartlett window";
      }
  
  }
  