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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/*
* Copyright (C) 2004 by Jonathan Naylor G4KLX
*
* 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.
*/
#include "FFTPhase.h"
#include "common/Exception.h"
#include "common/Hamming.h"
#include "common/Inline.h"
#include "common/SFFT.h"
#include "common/NCO.h"
#include "fsk441/FSK441Defs.h"
int main(int argc, char *argv[])
{
if (argc < 2) {
::fprintf(stderr, "Usage: FFTPhase <freq offset>\n");
return 1;
}
double offset = ::atof(argv[1]);
try {
CFFTPhase phase(offset);
phase.run();
}
catch (CException& ex) {
::fprintf(stderr, "FFTPhase: error: %s\n", ex.getMessage().c_str());
return 1;
}
catch (...) {
::fprintf(stderr, "FFTPhase: an error has occured\n");
return 1;
}
return 0;
}
CFFTPhase::CFFTPhase(double offset) :
m_offset(offset)
{
}
CFFTPhase::~CFFTPhase()
{
}
void CFFTPhase::run()
{
double f = double(FSK441_SAMPLE_RATE) / double(FSK441_FFT_LENGTH);
CNCO nco(FSK441_SAMPLE_RATE, FSK441_SEND_VOLUME);
CSFFT sfft(FSK441_FFT_LENGTH, FSK441_BIN0, FSK441_BIN3 + 1);
complex<double> bins[FSK441_FFT_LENGTH];
nco.setPhase(1.67546);
double storePhase[FSK441_BIN3 + 1];
storePhase[FSK441_BIN0] = 0.0;
storePhase[FSK441_BIN1] = 0.0;
storePhase[FSK441_BIN2] = 0.0;
storePhase[FSK441_BIN3] = 0.0;
for (int n = 0; n < 125; n++) {
int l = FSK441_BIN2;
double sample = 0.0;
/*
if (n < 25) {
l = 0;
} else if (n < 50) {
l = FSK441_BIN2;
} else if (n < 75) {
l = FSK441_BIN1;
} else if (n < 100) {
l = FSK441_BIN3;
} else {
l = FSK441_BIN0;
}
*/
double frequency = m_offset + double(l) * f;
nco.generate(frequency, &sample, 1);
sfft.process(sample, bins);
if (l != 0 && n >= 25) {
::fprintf(stderr, "%03d %d: ", n, l - FSK441_BIN0);
for (int i = FSK441_BIN0; i <= FSK441_BIN3; i++) {
double ampl = ::CABS(bins[i]);
double phase = ::CPHASE(bins[i]);
double diff = phase - storePhase[i];
if (diff < 0.0)
diff += 2.0 * M_PI;
::fprintf(stderr, "%.1f %.1f %.1f\t",
ampl, phase, diff);
storePhase[i] = phase;
}
::fprintf(stderr, "\n");
}
}
}
|
