/* MFCC.c
*
* Mel Frequency Cepstral Coefficients class.
*
* Copyright (C) 1993-2002 David Weenink
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
djmw 20020813 GPL header
*/
#include "MFCC.h"
#include "NUM2.h"
class_methods (MFCC, CC)
class_methods_end
MFCC MFCC_create (double tmin, double tmax, long nt, double dt, double t1,
long maximumNumberOfCoefficients, double fmin_mel, double fmax_mel)
{
MFCC me = new (MFCC);
if (me == NULL || ! CC_init (me, tmin, tmax, nt, dt, t1,
maximumNumberOfCoefficients, fmin_mel, fmax_mel)) forget (me);
return me;
}
int MFCC_lifter (MFCC me, long lifter)
{
long i, frame;
double *c;
Melder_assert (lifter > 0);
if ((c = NUMdvector (1, my maximumNumberOfCoefficients)) == NULL) return 0;
for (i=1; i <= my maximumNumberOfCoefficients; i++)
{
c[i] = (1 + lifter / 2 * sin (NUMpi * i / lifter));
}
for (frame=1; frame <= my nx; frame++)
{
CC_Frame cf = & my frame[frame];
for (i=1; i <= cf -> numberOfCoefficients; i++)
{
cf -> c[i] *= c[i];
}
}
NUMdvector_free (c, 1);
return Melder_hasError ();
}
/* End of file MFCC.c */
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