kopia lustrzana https://github.com/f4exb/sdrangel
433 wiersze
11 KiB
C++
433 wiersze
11 KiB
C++
/* fmd.c
|
|
|
|
This file is part of a program that implements a Software-Defined Radio.
|
|
|
|
Copyright (C) 2013, 2023 Warren Pratt, NR0V
|
|
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
|
|
|
|
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
|
|
The author can be reached by email at
|
|
|
|
warren@wpratt.com
|
|
|
|
*/
|
|
|
|
#include <array>
|
|
|
|
#include "comm.hpp"
|
|
#include "fircore.hpp"
|
|
#include "fcurve.hpp"
|
|
#include "fir.hpp"
|
|
#include "wcpAGC.hpp"
|
|
#include "snotch.hpp"
|
|
#include "fmd.hpp"
|
|
|
|
namespace WDSP {
|
|
|
|
void FMD::calc()
|
|
{
|
|
// pll
|
|
omega_min = TWOPI * fmin / rate;
|
|
omega_max = TWOPI * fmax / rate;
|
|
g1 = 1.0 - exp(-2.0 * omegaN * zeta / rate);
|
|
g2 = -g1 + 2.0 * (1 - exp(-omegaN * zeta / rate) * cos(omegaN / rate * sqrt(1.0 - zeta * zeta)));
|
|
phs = 0.0;
|
|
fil_out = 0.0;
|
|
omega = 0.0;
|
|
pllpole = omegaN * sqrt(2.0 * zeta * zeta + 1.0 + sqrt((2.0 * zeta * zeta + 1.0) * (2.0 * zeta * zeta + 1.0) + 1)) / TWOPI;
|
|
// dc removal
|
|
mtau = exp(-1.0 / (rate * tau));
|
|
onem_mtau = 1.0 - mtau;
|
|
fmdc = 0.0;
|
|
// pll audio gain
|
|
again = rate / (deviation * TWOPI);
|
|
// CTCSS Removal
|
|
sntch = new SNOTCH(
|
|
1,
|
|
size,
|
|
out,
|
|
out,
|
|
(int) rate,
|
|
ctcss_freq,
|
|
0.0002)
|
|
;
|
|
// detector limiter
|
|
plim = new WCPAGC(
|
|
1, // run - always ON
|
|
5, // mode
|
|
1, // 0 for max(I,Q), 1 for envelope
|
|
out, // input buff pointer
|
|
out, // output buff pointer
|
|
size, // io_buffsize
|
|
(int)rate, // sample rate
|
|
0.001, // tau_attack
|
|
0.008, // tau_decay
|
|
4, // n_tau
|
|
lim_gain, // max_gain (sets threshold, initial value)
|
|
1.0, // var_gain / slope
|
|
1.0, // fixed_gain
|
|
1.0, // max_input
|
|
0.9, // out_targ
|
|
0.250, // tau_fast_backaverage
|
|
0.004, // tau_fast_decay
|
|
4.0, // pop_ratio
|
|
0, // hang_enable
|
|
0.500, // tau_hang_backmult
|
|
0.500, // hangtime
|
|
2.000, // hang_thresh
|
|
0.100); // tau_hang_decay
|
|
}
|
|
|
|
void FMD::decalc()
|
|
{
|
|
delete plim;
|
|
delete sntch;
|
|
}
|
|
|
|
FMD::FMD(
|
|
int _run,
|
|
int _size,
|
|
float* _in,
|
|
float* _out,
|
|
int _rate,
|
|
double _deviation,
|
|
double _f_low,
|
|
double _f_high,
|
|
double _fmin,
|
|
double _fmax,
|
|
double _zeta,
|
|
double _omegaN,
|
|
double _tau,
|
|
double _afgain,
|
|
int _sntch_run,
|
|
double _ctcss_freq,
|
|
int _nc_de,
|
|
int _mp_de,
|
|
int _nc_aud,
|
|
int _mp_aud
|
|
) :
|
|
run(_run),
|
|
size(_size),
|
|
in(_in),
|
|
out(_out),
|
|
rate((double) _rate),
|
|
f_low(_f_low),
|
|
f_high(_f_high),
|
|
fmin(_fmin),
|
|
fmax(_fmax),
|
|
zeta(_zeta),
|
|
omegaN(_omegaN),
|
|
tau(_tau),
|
|
deviation(_deviation),
|
|
nc_de(_nc_de),
|
|
mp_de(_mp_de),
|
|
nc_aud(_nc_aud),
|
|
mp_aud(_mp_aud),
|
|
afgain(_afgain),
|
|
sntch_run(_sntch_run),
|
|
ctcss_freq(_ctcss_freq),
|
|
lim_run(0),
|
|
lim_gain(0.0001), // 2.5
|
|
lim_pre_gain(0.01) // 0.4
|
|
{
|
|
calc();
|
|
// de-emphasis filter
|
|
audio.resize(size * 2);
|
|
std::vector<float> impulse(2 * nc_de);
|
|
FCurve::fc_impulse (
|
|
impulse,
|
|
nc_de,
|
|
(float) f_low,
|
|
(float) f_high,
|
|
(float) (+20.0 * log10(f_high / f_low)),
|
|
0.0, 1,
|
|
(float) rate,
|
|
(float) (1.0 / (2.0 * size)),
|
|
0,
|
|
0
|
|
);
|
|
pde = new FIRCORE(size, audio.data(), out, mp_de, impulse);
|
|
// audio filter
|
|
std::vector<float> impulseb;
|
|
FIR::fir_bandpass(impulseb, nc_aud, 0.8 * f_low, 1.1 * f_high, rate, 0, 1, afgain / (2.0 * size));
|
|
paud = new FIRCORE(size, out, out, mp_aud, impulseb);
|
|
}
|
|
|
|
FMD::~FMD()
|
|
{
|
|
delete paud;
|
|
delete pde;
|
|
decalc();
|
|
}
|
|
|
|
void FMD::flush()
|
|
{
|
|
std::fill(audio.begin(), audio.end(), 0);
|
|
pde->flush();
|
|
paud->flush();
|
|
phs = 0.0;
|
|
fil_out = 0.0;
|
|
omega = 0.0;
|
|
fmdc = 0.0;
|
|
sntch->flush();
|
|
plim->flush();
|
|
}
|
|
|
|
void FMD::execute()
|
|
{
|
|
if (run)
|
|
{
|
|
int i;
|
|
double det;
|
|
double del_out;
|
|
std::array<double, 2> vco;
|
|
std::array<double, 2> corr;
|
|
|
|
for (i = 0; i < size; i++)
|
|
{
|
|
// pll
|
|
vco[0] = cos (phs);
|
|
vco[1] = sin (phs);
|
|
corr[0] = + in[2 * i + 0] * vco[0] + in[2 * i + 1] * vco[1];
|
|
corr[1] = - in[2 * i + 0] * vco[1] + in[2 * i + 1] * vco[0];
|
|
if ((corr[0] == 0.0) && (corr[1] == 0.0)) corr[0] = 1.0;
|
|
det = atan2 (corr[1], corr[0]);
|
|
del_out = fil_out;
|
|
omega += g2 * det;
|
|
if (omega < omega_min) omega = omega_min;
|
|
if (omega > omega_max) omega = omega_max;
|
|
fil_out = g1 * det + omega;
|
|
phs += del_out;
|
|
while (phs >= TWOPI) phs -= TWOPI;
|
|
while (phs < 0.0) phs += TWOPI;
|
|
// dc removal, gain, & demod output
|
|
fmdc = mtau * fmdc + onem_mtau * fil_out;
|
|
audio[2 * i + 0] = (float) (again * (fil_out - fmdc));
|
|
audio[2 * i + 1] = audio[2 * i + 0];
|
|
}
|
|
// de-emphasis
|
|
pde->execute();
|
|
// audio filter
|
|
paud->execute();
|
|
// CTCSS Removal
|
|
sntch->execute();
|
|
if (lim_run)
|
|
{
|
|
for (i = 0; i < 2 * size; i++)
|
|
out[i] *= (float) lim_pre_gain;
|
|
plim->execute();
|
|
}
|
|
}
|
|
else if (in != out)
|
|
std::copy( in, in + size * 2, out);
|
|
}
|
|
|
|
void FMD::setBuffers(float* _in, float* _out)
|
|
{
|
|
decalc();
|
|
in = _in;
|
|
out = _out;
|
|
calc();
|
|
pde->setBuffers(audio.data(), out);
|
|
paud->setBuffers(out, out);
|
|
plim->setBuffers(out, out);
|
|
}
|
|
|
|
void FMD::setSamplerate(int _rate)
|
|
{
|
|
decalc();
|
|
rate = _rate;
|
|
calc();
|
|
// de-emphasis filter
|
|
std::vector<float> impulse(2 * nc_de);
|
|
FCurve::fc_impulse (
|
|
impulse,
|
|
nc_de,
|
|
(float) f_low,
|
|
(float) f_high,
|
|
(float) (+20.0 * log10(f_high / f_low)),
|
|
0.0,
|
|
1,
|
|
(float) rate,
|
|
(float) (1.0 / (2.0 * size)),
|
|
0,
|
|
0
|
|
);
|
|
pde->setImpulse(impulse, 1);
|
|
// audio filter
|
|
std::vector<float> impulseb;
|
|
FIR::fir_bandpass(impulseb, nc_aud, 0.8 * f_low, 1.1 * f_high, rate, 0, 1, afgain / (2.0 * size));
|
|
paud->setImpulse(impulseb, 1);
|
|
plim->setSamplerate((int) rate);
|
|
}
|
|
|
|
void FMD::setSize(int _size)
|
|
{
|
|
decalc();
|
|
size = _size;
|
|
calc();
|
|
audio.resize(size * 2);
|
|
// de-emphasis filter
|
|
delete pde;
|
|
std::vector<float> impulse(2 * nc_de);
|
|
FCurve::fc_impulse (
|
|
impulse,
|
|
nc_de,
|
|
(float) f_low,
|
|
(float) f_high,
|
|
(float) (+20.0 * log10(f_high / f_low)),
|
|
0.0,
|
|
1,
|
|
(float) rate,
|
|
(float) (1.0 / (2.0 * size)),
|
|
0,
|
|
0
|
|
);
|
|
pde = new FIRCORE(size, audio.data(), out, mp_de, impulse);
|
|
// audio filter
|
|
delete paud;
|
|
std::vector<float> impulseb;
|
|
FIR::fir_bandpass(impulseb, nc_aud, 0.8 * f_low, 1.1 * f_high, rate, 0, 1, afgain / (2.0 * size));
|
|
paud = new FIRCORE(size, out, out, mp_aud, impulseb);
|
|
plim->setSize(size);
|
|
}
|
|
|
|
/********************************************************************************************************
|
|
* *
|
|
* RXA Properties *
|
|
* *
|
|
********************************************************************************************************/
|
|
|
|
void FMD::setDeviation(double _deviation)
|
|
{
|
|
deviation = _deviation;
|
|
again = rate / (deviation * TWOPI);
|
|
}
|
|
|
|
void FMD::setCTCSSFreq(double freq)
|
|
{
|
|
ctcss_freq = freq;
|
|
sntch->setFreq(ctcss_freq);
|
|
}
|
|
|
|
void FMD::setCTCSSRun(int _run)
|
|
{
|
|
sntch_run = _run;
|
|
sntch->setRun(sntch_run);
|
|
}
|
|
|
|
void FMD::setNCde(int nc)
|
|
{
|
|
if (nc_de != nc)
|
|
{
|
|
nc_de = nc;
|
|
std::vector<float> impulse(2 * nc_de);
|
|
FCurve::fc_impulse (
|
|
impulse,
|
|
nc_de,
|
|
(float) f_low,
|
|
(float) f_high,
|
|
(float) (+20.0 * log10(f_high / f_low)),
|
|
0.0,
|
|
1,
|
|
(float) rate,
|
|
(float) (1.0 / (2.0 * size)),
|
|
0,
|
|
0
|
|
);
|
|
pde->setNc(impulse);
|
|
}
|
|
}
|
|
|
|
void FMD::setMPde(int mp)
|
|
{
|
|
if (mp_de != mp)
|
|
{
|
|
mp_de = mp;
|
|
pde->setMp(mp_de);
|
|
}
|
|
}
|
|
|
|
void FMD::setNCaud(int nc)
|
|
{
|
|
if (nc_aud != nc)
|
|
{
|
|
nc_aud = nc;
|
|
std::vector<float> impulse;
|
|
FIR::fir_bandpass(impulse, nc_aud, 0.8 * f_low, 1.1 * f_high, rate, 0, 1, afgain / (2.0 * size));
|
|
paud->setNc(impulse);
|
|
}
|
|
}
|
|
|
|
void FMD::setMPaud(int mp)
|
|
{
|
|
if (mp_aud != mp)
|
|
{
|
|
mp_aud = mp;
|
|
paud->setMp(mp_aud);
|
|
}
|
|
}
|
|
|
|
void FMD::setLimRun(int _run)
|
|
{
|
|
if (lim_run != _run) {
|
|
lim_run = _run;
|
|
}
|
|
}
|
|
|
|
void FMD::setLimGain(double gaindB)
|
|
{
|
|
double gain = pow(10.0, gaindB / 20.0);
|
|
|
|
if (lim_gain != gain)
|
|
{
|
|
decalc();
|
|
lim_gain = gain;
|
|
calc();
|
|
}
|
|
}
|
|
|
|
void FMD::setAFFilter(double low, double high)
|
|
{
|
|
if (f_low != low || f_high != high)
|
|
{
|
|
f_low = low;
|
|
f_high = high;
|
|
// de-emphasis filter
|
|
std::vector<float> impulse(2 * nc_de);
|
|
FCurve::fc_impulse (
|
|
impulse,
|
|
nc_de,
|
|
(float) f_low,
|
|
(float) f_high,
|
|
(float) (+20.0 * log10(f_high / f_low)),
|
|
0.0,
|
|
1,
|
|
(float) rate,
|
|
(float) (1.0 / (2.0 * size)),
|
|
0,
|
|
0
|
|
);
|
|
pde->setImpulse(impulse, 1);
|
|
// audio filter
|
|
std::vector<float> impulseb;
|
|
FIR::fir_bandpass (impulseb, nc_aud, 0.8 * f_low, 1.1 * f_high, rate, 0, 1, afgain / (2.0 * size));
|
|
paud->setImpulse(impulseb, 1);
|
|
}
|
|
}
|
|
|
|
} // namespace WDSP
|