content: ///**
  //* 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 lib.sound.sampled.AudioFormat;
  //import lib.sound.sampled.AudioInputStream;
  //import lib.sound.sampled.AudioSystem;
  //import marytts.util.data.audio.MaryAudioUtils;
  //import marytts.util.math.FFT;
  //import marytts.util.math.MathUtils;
  //
  //
  ///**
  //*
  //* @author Marc Schr&ouml;der
  //*
  //* Displays the DFT spectrum of input signal
  //*
  //*/
  //public class SignalSpectrum  extends FunctionGraph
  //{
  //    public SignalSpectrum(AudioInputStream ais) {
  //        this(ais, DEFAULT_WIDTH, DEFAULT_HEIGHT);
  //    }
  //
  //    public SignalSpectrum(AudioInputStream ais, int width, int height) {
  //        super();
  //        if (!ais.getFormat().getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)) {
  //            ais = AudioSystem.getAudioInputStream(AudioFormat.Encoding.PCM_SIGNED, ais);
  //        }
  //        if (ais.getFormat().getChannels() > 1) {
  //            throw new IllegalArgumentException("Can only deal with mono audio signals");
  //        }
  //        int samplingRate = (int) ais.getFormat().getSampleRate();
  //        double[] signal = MaryAudioUtils.getSamplesAsDoubleArray(ais);
  //        initialise(signal, samplingRate, width, height);
  //    }
  //
  //    public SignalSpectrum(final double[] signal, int samplingRate)
  //    {
  //        this(signal, samplingRate, DEFAULT_WIDTH, DEFAULT_HEIGHT);
  //    }
  //
  //    public SignalSpectrum(final double[] signal, int samplingRate, int width, int height)
  //    {
  //        initialise(signal, samplingRate, width, height);
  //    }
  //
  //    protected void initialise(final double[] signal, int samplingRate, int width, int height)
  //    {
  //        int N = signal.length;
  //        if (!MathUtils.isPowerOfTwo(N)) {
  //            N = MathUtils.closestPowerOfTwoAbove(N);
  //        }
  //        double[] ar = new double[N];
  //        System.arraycopy(signal, 0, ar, 0, signal.length);
  //        // Transform:
  //        FFT.realTransform(ar, false);
  //        double[] freqs = FFT.computeAmplitudeSpectrum_FD(ar);
  //        process(freqs);
  //        double deltaF = (double) samplingRate / N;
  //        super.initialise(width, height, 0, deltaF, freqs);
  //    }
  //
  //    /**
  //     * Subclass can use this to compute power or log spectrum
  //     * @param freqs the frequencies that come out of the FFT.
  //     */
  //    protected void process(double[] freqs)
  //    {
  //    }
  //
  ////    public static void main(String[] args) throws Exception
  ////    {
  ////        for (int i=0; i<args.length; i++) {
  ////            AudioInputStream ais = AudioSystem.getAudioInputStream(new File(args[i]));
  ////            SignalSpectrum signalSpectrum = new SignalSpectrum(ais);
  ////            signalSpectrum.showInJFrame(args[i], true, false);
  ////        }
  ////    }
  //
  //}
  //
  