/**
* 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.display;
import java.io.File;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import marytts.util.math.MathUtils;
/**
*
* @author Marc Schröder
*
* Computes log of DFT spectrum
*
*/
public class LogSpectrum extends SignalSpectrum {
public LogSpectrum(AudioInputStream ais) {
this(ais, DEFAULT_WIDTH, DEFAULT_HEIGHT);
}
public LogSpectrum(AudioInputStream ais, int width, int height) {
super(ais, width, height);
}
public LogSpectrum(final double[] signal, int samplingRate) {
this(signal, samplingRate, DEFAULT_WIDTH, DEFAULT_HEIGHT);
}
public LogSpectrum(final double[] signal, int samplingRate, int width, int height) {
super(signal, samplingRate, width, height);
}
/**
* Compute log spectrum.
*
* @param freqs
* the frequencies that come out of the FFT.
*/
protected void process(double[] freqs) {
for (int i = 0; i < freqs.length; i++) {
// convert frequency amplitudes into energy, then into db.
freqs[i] = MathUtils.db(freqs[i] * freqs[i]);
}
}
public static void main(String[] args) throws Exception {
for (int i = 0; i < args.length; i++) {
AudioInputStream ais = AudioSystem.getAudioInputStream(new File(args[i]));
LogSpectrum signalSpectrum = new LogSpectrum(ais);
signalSpectrum.showInJFrame(args[i], true, false);
}
}
}