/**
* Portions Copyright 2006 DFKI GmbH.
* Portions Copyright 2001 Sun Microsystems, Inc.
* Portions Copyright 1999-2001 Language Technologies Institute,
* Carnegie Mellon University.
* All Rights Reserved. Use is subject to license terms.
*
* 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:
*
* 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.
*
* 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.analysis;
import java.io.IOException;
import marytts.util.data.ESTTrackReader;
import marytts.util.data.ESTTrackWriter;
/**
*
* Internally does the conversion between LPCs and LPCCs.
*
*/
public class Lpc2Lpcc {
private static float[][] convertData(float[][] lpc, int cepstrumOrder) {
int nLPC = lpc[0].length;
double gain = 0;
double[] a = new double[nLPC];
a[0] = 1.0; // Set a[0] to 1.0 once and for all
double[] c = new double[cepstrumOrder + 1];
float[][] lpcc = new float[lpc.length][cepstrumOrder + 1];
// For each LPC vector:
for (int i = 0; i < lpc.length; i++) {
// Dereference the gain, stored as a[0] in the EST format
gain = (double) (lpc[i][0]);
// Cast the LPC coeffs from float to double
// Note: a[0] has been permanently set to one in the above.
for (int k = 1; k < nLPC; k++) {
a[k] = (double) (lpc[i][k]);
}
// Do the conversion
c = CepstrumLPCAnalyser.lpc2lpcc(a, gain, cepstrumOrder);
// Cast the cesptrum back to floats
for (int k = 0; k <= cepstrumOrder; k++) {
lpcc[i][k] = (float) (c[k]);
}
// Note: lpcc[i][0] is now set to log(gain).
}
return (lpcc);
}
/**
* A method to convert between two files, from LPCs to LPCCs in EST format.
*
* @param cepstrumOrder
* The requested cepstrum order.
* @param inFileName
* The name of the input file.
* @param outFileName
* The name of the output file.
*
* @throws IOException
* IOException
*/
public static void convert(String inFileName, String outFileName, int cepstrumOrder) throws IOException {
// Load the input file
ESTTrackReader etr = new ESTTrackReader(inFileName);
// Convert
float[][] lpcc = convertData(etr.getFrames(), cepstrumOrder);
// Output the lpcc
ESTTrackWriter etw = new ESTTrackWriter(etr.getTimes(), lpcc, "lpcc");
etw.doWriteAndClose(outFileName, etr.isBinary(), etr.isBigEndian());
}
/**
* @param args
* args
* @throws IOException
* IOException
*/
public static void main(String[] args) throws IOException {
// Usage: ESTlpcToESTlpcc cepstrumOrder inFileName outFileName
convert(args[1], args[2], new Integer(args[0]).intValue());
}
}