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
|
/*
***************************************************************************
*
* Author: Teunis van Beelen
*
* Copyright (C) 2012 Teunis van Beelen
*
* teuniz@gmail.com
*
***************************************************************************
*
* 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 version 2 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 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
***************************************************************************
*
* This version of GPL is at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
*
***************************************************************************
*/
#ifndef zratio_filter_INCLUDED
#define zratio_filter_INCLUDED
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "third_party/kiss_fft/kiss_fftr.h"
struct zratio_filter_settings{
double crossoverfreq;
int dftblocksize;
double samplefreq;
int fft_outputbufsize;
double freqstep;
double f1;
double f2;
double f3;
double f4;
double *fft_inputbuf;
double *fft_outputbuf;
kiss_fftr_cfg cfg;
kiss_fft_cpx *kiss_fftbuf;
int smpls_in_inputbuf;
double zratio_value;
double *fft_inputbuf_bu;
int smpls_in_inputbuf_bu;
double zratio_value_bu;
double bitvalue;
};
struct zratio_filter_settings * create_zratio_filter(int, long long, double, double);
double run_zratio_filter(double, struct zratio_filter_settings *);
void free_zratio_filter(struct zratio_filter_settings *);
void reset_zratio_filter(struct zratio_filter_settings *);
void zratio_filter_save_buf(struct zratio_filter_settings *);
void zratio_filter_restore_buf(struct zratio_filter_settings *);
#endif
|
