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/* -*- c++ -*- */
/*
* Copyright 2004,2006,2010,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ctcss_squelch_ff_impl.h"
#include <boost/make_unique.hpp>
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),
d_mute(true)
{
// 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 = boost::make_unique<fft::goertzel>(d_rate, d_len, f_l);
d_goertzel_c = boost::make_unique<fft::goertzel>(d_rate, d_len, freq);
d_goertzel_r = boost::make_unique<fft::goertzel>(d_rate, d_len, f_r);
}
ctcss_squelch_ff_impl::~ctcss_squelch_ff_impl() {}
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 */
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