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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/* -*- c++ -*- */
/*
* Copyright 2004,2006,2010,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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 3, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ctcss_squelch_ff_impl.h"
namespace gr {
namespace analog {
static float ctcss_tones[] = { 67.0, 71.9, 74.4, 77.0, 79.7, 82.5, 85.4, 88.5,
91.5, 94.8, 97.4, 100.0, 103.5, 107.2, 110.9, 114.8,
118.8, 123.0, 127.3, 131.8, 136.5, 141.3, 146.2, 151.4,
156.7, 162.2, 167.9, 173.8, 179.9, 186.2, 192.8, 203.5,
210.7, 218.1, 225.7, 233.6, 241.8, 250.3 };
static int max_tone_index = 37;
ctcss_squelch_ff::sptr
ctcss_squelch_ff::make(int rate, float freq, float level, int len, int ramp, bool gate)
{
return gnuradio::get_initial_sptr(
new ctcss_squelch_ff_impl(rate, freq, level, len, ramp, gate));
}
int ctcss_squelch_ff_impl::find_tone(float freq)
{
for (int i = 0; i <= max_tone_index; i++)
if (ctcss_tones[i] == freq) // FIXME: make almost equal
return i;
return -1;
}
void ctcss_squelch_ff_impl::compute_freqs(const float& freq, float& f_l, float& f_r)
{
int i = find_tone(freq);
// Non-standard tones or edge tones get 2% guard band, otherwise
// guards are set at adjacent ctcss tone frequencies
if (i == -1 || i == 0)
f_l = freq * 0.98;
else
f_l = ctcss_tones[i - 1];
if (i == -1 || i == max_tone_index)
f_r = freq * 1.02;
else
f_r = ctcss_tones[i + 1];
}
void ctcss_squelch_ff_impl::update_fft_params()
{
float f_l, f_r;
compute_freqs(d_freq, f_l, f_r);
d_goertzel_l->set_params(d_rate, d_len, f_l);
d_goertzel_c->set_params(d_rate, d_len, d_freq);
d_goertzel_r->set_params(d_rate, d_len, f_r);
}
ctcss_squelch_ff_impl::ctcss_squelch_ff_impl(
int rate, float freq, float level, int len, int ramp, bool gate)
: block("ctcss_squelch_ff",
io_signature::make(1, 1, sizeof(float)),
io_signature::make(1, 1, sizeof(float))),
squelch_base_ff_impl("ctcss_squelch_ff", ramp, gate)
{
d_freq = freq;
d_level = level;
d_rate = rate;
// Default is 100 ms detection time
if (len == 0)
d_len = (int)(d_rate / 10.0);
else
d_len = len;
float f_l, f_r;
compute_freqs(d_freq, f_l, f_r);
d_goertzel_l = new fft::goertzel(d_rate, d_len, f_l);
d_goertzel_c = new fft::goertzel(d_rate, d_len, freq);
d_goertzel_r = new fft::goertzel(d_rate, d_len, f_r);
d_mute = true;
}
ctcss_squelch_ff_impl::~ctcss_squelch_ff_impl()
{
delete d_goertzel_l;
delete d_goertzel_c;
delete d_goertzel_r;
}
std::vector<float> ctcss_squelch_ff_impl::squelch_range() const
{
std::vector<float> r(3);
r[0] = 0.0;
r[1] = 1.0;
r[2] = (r[1] - r[0]) / 100; // step size
return r;
}
void ctcss_squelch_ff_impl::update_state(const float& in)
{
d_goertzel_l->input(in);
d_goertzel_c->input(in);
d_goertzel_r->input(in);
float rounder = 100000;
float d_out_l, d_out_c, d_out_r;
if (d_goertzel_c->ready()) {
d_out_l = floor(rounder * abs(d_goertzel_l->output())) / rounder;
d_out_c = floor(rounder * abs(d_goertzel_c->output())) / rounder;
d_out_r = floor(rounder * abs(d_goertzel_r->output())) / rounder;
// printf("d_out_l=%f d_out_c=%f d_out_r=%f\n", d_out_l, d_out_c, d_out_r);
d_mute = (d_out_c < d_level || d_out_c < d_out_l || d_out_c < d_out_r);
}
}
void ctcss_squelch_ff_impl::set_level(float level)
{
gr::thread::scoped_lock l(d_setlock);
d_level = level;
}
void ctcss_squelch_ff_impl::set_frequency(float frequency)
{
gr::thread::scoped_lock l(d_setlock);
d_freq = frequency;
update_fft_params();
}
} /* namespace analog */
} /* namespace gr */
|
