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/* -*- 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;
}
ctcss_squelch_ff_impl::ctcss_squelch_ff_impl(int rate, float freq, float level,
int len, int ramp, bool gate)
: gr_block("ctcss_squelch_ff",
gr_make_io_signature(1, 1, sizeof(float)),
gr_make_io_signature(1, 1, sizeof(float))),
squelch_base_ff_impl("ctcss_squelch_ff", ramp, gate)
{
d_freq = freq;
d_level = level;
// Default is 100 ms detection time
if(len == 0)
d_len = (int)(rate/10.0);
else
d_len = len;
int i = find_tone(freq);
// Non-standard tones or edge tones get 2% guard band, otherwise
// guards are set at adjacent ctcss tone frequencies
float f_l, f_r;
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];
d_goertzel_l = fft::goertzel(rate, d_len, f_l);
d_goertzel_c = fft::goertzel(rate, d_len, freq);
d_goertzel_r = fft::goertzel(rate, d_len, f_r);
d_mute = true;
}
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);
}
}
} /* namespace analog */
} /* namespace gr */
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