1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* ----------------------------------------------------------------- */
/* 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: _lpc.c,v 1.19 2015/12/14 01:14:17 uratec Exp $
LPC Analysis Using Levinson-Durbin method
int lpc(x, flng, a, m);
double *x : input sequence
int flng : flame length
double *a : LP coefficients
int m : order of LPC
double f : minimum value of the determinant
of the normal matrix
return value : 0 -> normally completed
-1 -> abnormally completed
-2 -> unstable LPC
******************************************************************/
#include <stdio.h>
#include <stdlib.h>
#if defined(WIN32)
#include "SPTK.h"
#else
#include <SPTK.h>
#endif
int lpc(double *x, const int flng, double *a, const int m, const double f)
{
int flag;
static double *r = NULL;
static int size;
if (r == NULL) {
r = dgetmem(m + 1);
size = m;
}
if (m > size) {
free(r);
r = dgetmem(m + 1);
size = m;
}
acorr(x, flng, r, m);
flag = levdur(r, a, m, f);
return (flag);
}
|
