/**
* Copyright 2004-2006 DFKI GmbH.
* All Rights Reserved. Use is subject to license terms.
*
* This file is part of MARY TTS.
*
* 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.
*
* 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/>.
*
*/
package marytts.signalproc.filter;
import marytts.util.math.MathUtils;
/**
* @author Marc Schröder
*
*/
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);
}
}