content: /**
   * Copyright 2004-2006 DFKI GmbH.
   * All Rights Reserved.  Use is subject to license terms.
   * <p/>
   * This file is part of MARY TTS.
   * <p/>
   * MARY TTS 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, version 3 of the License.
   * <p/>
   * 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.
   * <p/>
   * 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/>.
   */
  package marytts.signalproc.filter;
  
  import marytts.util.math.MathUtils;
  
  /**
   * @author Marc Schr&ouml;der
   */
  public class AveragingFilter extends FIRFilter {
      public AveragingFilter(double lengthInSeconds, int samplingRate) {
          this((int) (lengthInSeconds * samplingRate));
      }
  
  
      public AveragingFilter(int lengthInSamples) {
          int fftLength = MathUtils.closestPowerOfTwoAbove(lengthInSamples);
          if (fftLength == lengthInSamples) fftLength *= 2;
          double[] impulseResponse = new double[lengthInSamples];
          // Straight impulse response:
          for (int i = 0; i < lengthInSamples; i++) {
              impulseResponse[i] = 1. / lengthInSamples;
          }
          initialise(impulseResponse, fftLength - lengthInSamples);
      }
  
  }
  
  