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gen.cpp
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/* gen.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2013 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
*/
#include <chrono>
#include "comm.hpp"
#include "gen.hpp"
#include "TXA.hpp"
namespace WDSP {
void GEN::calc_tone()
{
tone.phs = 0.0;
tone.delta = TWOPI * tone.freq / rate;
tone.cosdelta = cos (tone.delta);
tone.sindelta = sin (tone.delta);
}
void GEN::calc_tt()
{
tt.phs1 = 0.0;
tt.phs2 = 0.0;
tt.delta1 = TWOPI * tt.f1 / rate;
tt.delta2 = TWOPI * tt.f2 / rate;
tt.cosdelta1 = cos (tt.delta1);
tt.cosdelta2 = cos (tt.delta2);
tt.sindelta1 = sin (tt.delta1);
tt.sindelta2 = sin (tt.delta2);
}
void GEN::calc_sweep()
{
sweep.phs = 0.0;
sweep.dphs = TWOPI * sweep.f1 / rate;
sweep.d2phs = TWOPI * sweep.sweeprate / (rate * rate);
sweep.dphsmax = TWOPI * sweep.f2 / rate;
}
void GEN::calc_sawtooth()
{
saw.period = 1.0 / saw.f;
saw.delta = 1.0 / rate;
saw.t = 0.0;
}
void GEN::calc_triangle()
{
tri.period = 1.0 / tri.f;
tri.half = 0.5 * tri.period;
tri.delta = 1.0 / rate;
tri.t = 0.0;
tri.t1 = 0.0;
}
void GEN::calc_pulse ()
{
double delta;
double theta;
pulse.pperiod = 1.0 / pulse.pf;
pulse.tphs = 0.0;
pulse.tdelta = TWOPI * pulse.tf / rate;
pulse.tcosdelta = cos (pulse.tdelta);
pulse.tsindelta = sin (pulse.tdelta);
pulse.pntrans = (int)(pulse.ptranstime * rate);
pulse.pnon = (int)(pulse.pdutycycle * pulse.pperiod * rate);
pulse.pnoff = (int)(pulse.pperiod * rate) - pulse.pnon - 2 * pulse.pntrans;
if (pulse.pnoff < 0)
pulse.pnoff = 0;
pulse.pcount = pulse.pnoff;
pulse.state = PState::OFF;
pulse.ctrans.resize(pulse.pntrans + 1);
delta = PI / (float)pulse.pntrans;
theta = 0.0;
for (int i = 0; i <= pulse.pntrans; i++)
{
pulse.ctrans[i] = 0.5 * (1.0 - cos (theta));
theta += delta;
}
}
void GEN::calc()
{
calc_tone();
calc_tt();
calc_sweep();
calc_sawtooth();
calc_triangle();
calc_pulse();
}
GEN::GEN(
int _run,
int _size,
float* _in,
float* _out,
int _rate,
int _mode
) :
run(_run),
size(_size),
in(_in),
out(_out),
rate((double) _rate),
mode(_mode)
{
// tone
tone.mag = 1.0;
tone.freq = 1000.0;
// two-tone
tt.mag1 = 0.5;
tt.mag2 = 0.5;
tt.f1 = + 900.0;
tt.f2 = + 1700.0;
// noise
srand ((unsigned int) time (nullptr));
noise.mag = 1.0;
// sweep
sweep.mag = 1.0;
sweep.f1 = -20000.0;
sweep.f2 = +20000.0;
sweep.sweeprate = +4000.0;
// sawtooth
saw.mag = 1.0;
saw.f = 500.0;
// triangle
tri.mag = 1.0;
tri.f = 500.0;
// pulse
pulse.mag = 1.0;
pulse.pf = 0.25;
pulse.pdutycycle = 0.25;
pulse.ptranstime = 0.002;
pulse.tf = 1000.0;
calc();
}
void GEN::flush()
{
pulse.state = PState::OFF;
}
void GEN::execute()
{
if (run)
{
switch (mode)
{
case 0: // tone
{
double t1;
double t2;
double cosphase = cos (tone.phs);
double sinphase = sin (tone.phs);
for (int i = 0; i < size; i++)
{
out[2 * i + 0] = (float) (+ tone.mag * cosphase);
out[2 * i + 1] = (float) (- tone.mag * sinphase);
t1 = cosphase;
t2 = sinphase;
cosphase = t1 * tone.cosdelta - t2 * tone.sindelta;
sinphase = t1 * tone.sindelta + t2 * tone.cosdelta;
tone.phs += tone.delta;
if (tone.phs >= TWOPI) tone.phs -= TWOPI;
if (tone.phs < 0.0 ) tone.phs += TWOPI;
}
break;
}
case 1: // two-tone
{
double tcos;
double tsin;
double cosphs1 = cos (tt.phs1);
double sinphs1 = sin (tt.phs1);
double cosphs2 = cos (tt.phs2);
double sinphs2 = sin (tt.phs2);
for (int i = 0; i < size; i++)
{
out[2 * i + 0] = (float) (+ tt.mag1 * cosphs1 + tt.mag2 * cosphs2);
out[2 * i + 1] = (float) (- tt.mag1 * sinphs1 - tt.mag2 * sinphs2);
tcos = cosphs1;
tsin = sinphs1;
cosphs1 = tcos * tt.cosdelta1 - tsin * tt.sindelta1;
sinphs1 = tcos * tt.sindelta1 + tsin * tt.cosdelta1;
tt.phs1 += tt.delta1;
if (tt.phs1 >= TWOPI) tt.phs1 -= TWOPI;
if (tt.phs1 < 0.0 ) tt.phs1 += TWOPI;
tcos = cosphs2;
tsin = sinphs2;
cosphs2 = tcos * tt.cosdelta2 - tsin * tt.sindelta2;
sinphs2 = tcos * tt.sindelta2 + tsin * tt.cosdelta2;
tt.phs2 += tt.delta2;
if (tt.phs2 >= TWOPI) tt.phs2 -= TWOPI;
if (tt.phs2 < 0.0 ) tt.phs2 += TWOPI;
}
break;
}
case 2: // noise
{
double r1;
double r2;
double c;
double rad;
for (int i = 0; i < size; i++)
{
do
{
r1 = 2.0 * (double)rand() / (double)RAND_MAX - 1.0;
r2 = 2.0 * (double)rand() / (double)RAND_MAX - 1.0;
c = r1 * r1 + r2 * r2;
} while (c >= 1.0);
rad = sqrt (-2.0 * log (c) / c);
out[2 * i + 0] = (float) (noise.mag * rad * r1);
out[2 * i + 1] = (float) (noise.mag * rad * r2);
}
break;
}
case 3: // sweep
{
for (int i = 0; i < size; i++)
{
out[2 * i + 0] = (float) (+ sweep.mag * cos(sweep.phs));
out[2 * i + 1] = (float) (- sweep.mag * sin(sweep.phs));
sweep.phs += sweep.dphs;
sweep.dphs += sweep.d2phs;
if (sweep.phs >= TWOPI) sweep.phs -= TWOPI;
if (sweep.phs < 0.0 ) sweep.phs += TWOPI;
if (sweep.dphs > sweep.dphsmax)
sweep.dphs = TWOPI * sweep.f1 / rate;
}
break;
}
case 4: // sawtooth (audio only)
{
for (int i = 0; i < size; i++)
{
if (saw.t > saw.period) saw.t -= saw.period;
out[2 * i + 0] = (float) (saw.mag * (saw.t * saw.f - 1.0));
out[2 * i + 1] = 0.0;
saw.t += saw.delta;
}
}
break;
case 5: // triangle (audio only)
{
for (int i = 0; i < size; i++)
{
if (tri.t > tri.period) tri.t1 = tri.t -= tri.period;
if (tri.t > tri.half) tri.t1 -= tri.delta;
else tri.t1 += tri.delta;
out[2 * i + 0] = (float) (tri.mag * (4.0 * tri.t1 * tri.f - 1.0));
out[2 * i + 1] = 0.0;
tri.t += tri.delta;
}
}
break;
case 6: // pulse (audio only)
{
double t1;
double t2;
double cosphase = cos (pulse.tphs);
double sinphase = sin (pulse.tphs);
for (int i = 0; i < size; i++)
{
if (pulse.pnoff != 0)
switch (pulse.state)
{
case PState::OFF:
out[2 * i + 0] = 0.0;
if (--pulse.pcount == 0)
{
pulse.state = PState::UP;
pulse.pcount = pulse.pntrans;
}
break;
case PState::UP:
out[2 * i + 0] = (float) (pulse.mag * cosphase * pulse.ctrans[pulse.pntrans - pulse.pcount]);
if (--pulse.pcount == 0)
{
pulse.state = PState::ON;
pulse.pcount = pulse.pnon;
}
break;
case PState::ON:
out[2 * i + 0] = (float) (pulse.mag * cosphase);
if (--pulse.pcount == 0)
{
pulse.state = PState::DOWN;
pulse.pcount = pulse.pntrans;
}
break;
case PState::DOWN:
out[2 * i + 0] = (float) (pulse.mag * cosphase * pulse.ctrans[pulse.pcount]);
if (--pulse.pcount == 0)
{
pulse.state = PState::OFF;
pulse.pcount = pulse.pnoff;
}
break;
}
else
out[2 * i + 0] = 0.0;
out[2 * i + 1] = 0.0;
t1 = cosphase;
t2 = sinphase;
cosphase = t1 * pulse.tcosdelta - t2 * pulse.tsindelta;
sinphase = t1 * pulse.tsindelta + t2 * pulse.tcosdelta;
pulse.tphs += pulse.tdelta;
if (pulse.tphs >= TWOPI) pulse.tphs -= TWOPI;
if (pulse.tphs < 0.0 ) pulse.tphs += TWOPI;
}
}
break;
default: // silence
{
std::fill(out, out + size * 2, 0);
break;
}
}
}
else if (in != out)
std::copy( in, in + size * 2, out);
}
void GEN::setBuffers(float* _in, float* _out)
{
in = _in;
out = _out;
}
void GEN::setSamplerate(int _rate)
{
rate = _rate;
calc();
}
void GEN::setSize(int _size)
{
size = _size;
flush();
}
/********************************************************************************************************
* *
* Public Properties *
* *
********************************************************************************************************/
// 'PreGen', gen0
void GEN::SetPreRun(int _run)
{
run = _run;
}
void GEN::SetPreMode(int _mode)
{
mode = _mode;
}
void GEN::SetPreToneMag(float mag)
{
tone.mag = mag;
}
void GEN::SetPreToneFreq(float freq)
{
tone.freq = freq;
calc_tone();
}
void GEN::SetPreNoiseMag (float mag)
{
noise.mag = mag;
}
void GEN::SetPreSweepMag(float mag)
{
sweep.mag = mag;
}
void GEN::SetPreSweepFreq(float freq1, float freq2)
{
sweep.f1 = freq1;
sweep.f2 = freq2;
calc_sweep();
}
void GEN::SetPreSweepRate(float _rate)
{
sweep.sweeprate = _rate;
calc_sweep();
}
/********************************************************************************************************
* *
* TXA Properties *
* *
********************************************************************************************************/
// 'PreGen', gen0
void GEN::SetPreGenRun (TXA& txa, int run)
{
txa.gen0->run = run;
}
void GEN::SetPreGenMode (TXA& txa, int mode)
{
txa.gen0->mode = mode;
}
void GEN::SetPreGenToneMag (TXA& txa, float mag)
{
txa.gen0->tone.mag = mag;
}
void GEN::SetPreGenToneFreq (TXA& txa, float freq)
{
txa.gen0->tone.freq = freq;
txa.gen0->calc_tone();
}
void GEN::SetPreGenNoiseMag (TXA& txa, float mag)
{
txa.gen0->noise.mag = mag;
}
void GEN::SetPreGenSweepMag (TXA& txa, float mag)
{
txa.gen0->sweep.mag = mag;
}
void GEN::SetPreGenSweepFreq (TXA& txa, float freq1, float freq2)
{
txa.gen0->sweep.f1 = freq1;
txa.gen0->sweep.f2 = freq2;
txa.gen0->calc_sweep();
}
void GEN::SetPreGenSweepRate (TXA& txa, float rate)
{
txa.gen0->sweep.sweeprate = rate;
txa.gen0->calc_sweep();
}
void GEN::SetPreGenSawtoothMag (TXA& txa, float mag)
{
txa.gen0->saw.mag = mag;
}
void GEN::SetPreGenSawtoothFreq (TXA& txa, float freq)
{
txa.gen0->saw.f = freq;
txa.gen0->calc_sawtooth();
}
void GEN::SetPreGenTriangleMag (TXA& txa, float mag)
{
txa.gen0->tri.mag = mag;
}
void GEN::SetPreGenTriangleFreq (TXA& txa, float freq)
{
txa.gen0->tri.f = freq;
txa.gen0->calc_triangle();
}
void GEN::SetPreGenPulseMag (TXA& txa, float mag)
{
txa.gen0->pulse.mag = mag;
}
void GEN::SetPreGenPulseFreq (TXA& txa, float freq)
{
txa.gen0->pulse.pf = freq;
txa.gen0->calc_pulse();
}
void GEN::SetPreGenPulseDutyCycle (TXA& txa, float dc)
{
txa.gen0->pulse.pdutycycle = dc;
txa.gen0->calc_pulse();
}
void GEN::SetPreGenPulseToneFreq (TXA& txa, float freq)
{
txa.gen0->pulse.tf = freq;
txa.gen0->calc_pulse();
}
void GEN::SetPreGenPulseTransition (TXA& txa, float transtime)
{
txa.gen0->pulse.ptranstime = transtime;
txa.gen0->calc_pulse();
}
// 'PostGen', gen1
void GEN::SetPostGenRun (TXA& txa, int run)
{
txa.gen1->run = run;
}
void GEN::SetPostGenMode (TXA& txa, int mode)
{
txa.gen1->mode = mode;
}
void GEN::SetPostGenToneMag (TXA& txa, float mag)
{
txa.gen1->tone.mag = mag;
}
void GEN::SetPostGenToneFreq (TXA& txa, float freq)
{
txa.gen1->tone.freq = freq;
txa.gen1->calc_tone();
}
void GEN::SetPostGenTTMag (TXA& txa, float mag1, float mag2)
{
txa.gen1->tt.mag1 = mag1;
txa.gen1->tt.mag2 = mag2;
}
void GEN::SetPostGenTTFreq (TXA& txa, float freq1, float freq2)
{
txa.gen1->tt.f1 = freq1;
txa.gen1->tt.f2 = freq2;
txa.gen1->calc_tt();
}
void GEN::SetPostGenSweepMag (TXA& txa, float mag)
{
txa.gen1->sweep.mag = mag;
}
void GEN::SetPostGenSweepFreq (TXA& txa, float freq1, float freq2)
{
txa.gen1->sweep.f1 = freq1;
txa.gen1->sweep.f2 = freq2;
txa.gen1->calc_sweep();
}
void GEN::SetPostGenSweepRate (TXA& txa, float rate)
{
txa.gen1->sweep.sweeprate = rate;
txa.gen1->calc_sweep();
}
} // namespace WDSP