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/* ----------------------------------------------------------------- */
/* The Speech Signal Processing Toolkit (SPTK) */
/* developed by SPTK Working Group */
/* http://sp-tk.sourceforge.net/ */
/* ----------------------------------------------------------------- */
/* */
/* Copyright (c) 1984-2007 Tokyo Institute of Technology */
/* Interdisciplinary Graduate School of */
/* Science and Engineering */
/* */
/* 1996-2015 Nagoya Institute of Technology */
/* Department of Computer Science */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the following */
/* conditions are met: */
/* */
/* - Redistributions of source code must retain the above copyright */
/* notice, this list of conditions and the following disclaimer. */
/* - Redistributions in binary form must reproduce the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer in the documentation and/or other materials provided */
/* with the distribution. */
/* - Neither the name of the SPTK working group nor the names of its */
/* contributors may be used to endorse or promote products derived */
/* from this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS */
/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, */
/* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, */
/* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY */
/* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE */
/* POSSIBILITY OF SUCH DAMAGE. */
/* ----------------------------------------------------------------- */
/*******************************************************************
$Id: _phase.c,v 1.17 2015/12/14 01:14:21 uratec Exp $
comupte phase of digital filter or real seaquence
phase(p, mp, z, mz, ph, flng)
double *p : numerator cofficients
int mp : order of numerator polynomial
double *z : denominator cofficients
int mz : order of denominator polynomilal
doble *ph : phase
int flng : FFT size
int unlap : unlapping
Naohiro Isshiki Feb.1995
********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#if defined(WIN32)
#include "SPTK.h"
#else
#include <SPTK.h>
#endif
void phase(double *p, const int mp, double *z, const int mz, double *ph,
const int flng, const int unlap)
{
static double *x;
static int fsize = 0;
double *y, *xx, *yy, *py;
int no, i, offset;
double pi;
pi = atan(1.) * 4.;
no = flng / 2 + 1;
if (flng > fsize) {
if (x != NULL)
free(x);
fsize = flng;
x = dgetmem(4 * flng + no);
}
y = &x[flng];
xx = &y[flng];
yy = &xx[flng];
py = &yy[flng];
fillz(x, sizeof(*x), flng);
fillz(xx, sizeof(*xx), flng);
movem(z, x, mz + 1, sizeof(*z));
movem(p, xx, mp + 1, sizeof(*p));
fftr(x, y, flng);
xx[0] = 1;
fftr(xx, yy, flng);
for (i = 0; i < no; i++) {
ph[i] = x[i] * xx[i] + y[i] * yy[i];
py[i] = y[i] * xx[i] - x[i] * yy[i];
}
offset = 0;
i = 0;
ph[i] = atan2(py[i], ph[i]) / pi;
i++;
for (; i < no; i++) {
ph[i] = atan2(py[i], ph[i]) / pi;
if (unlap) {
if (ph[i - 1] - ph[i] - offset > 1)
offset += 2;
else if (ph[i] + offset - ph[i - 1] > 1)
offset -= 2;
ph[i] += offset;
}
}
return;
}
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