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sdrangel/wdsp/wcpAGC.cpp
f4exb 40f7ecdaa0 WDSP: more double precision calculation
2024-07-18 02:08:05 +02:00

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/* wcpAGC.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2011 - 2017 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
or by paper mail at
Warren Pratt
11303 Empire Grade
Santa Cruz, CA 95060
*/
#include "comm.hpp"
#include "nbp.hpp"
#include "wcpAGC.hpp"
#include "RXA.hpp"
#include "TXA.hpp"
namespace WDSP {
void WCPAGC::calc_wcpagc (WCPAGC *a)
{
//assign constants
a->ring_buffsize = RB_SIZE;
//do one-time initialization
a->out_index = -1;
a->ring_max = 0.0;
a->volts = 0.0;
a->save_volts = 0.0;
a->fast_backaverage = 0.0;
a->hang_backaverage = 0.0;
a->hang_counter = 0;
a->decay_type = 0;
a->state = 0;
a->ring = new double[RB_SIZE * 2]; // (float *)malloc0(RB_SIZE * sizeof(complex));
a->abs_ring = new double[RB_SIZE]; //(float *)malloc0(RB_SIZE * sizeof(float));
loadWcpAGC(a);
}
void WCPAGC::decalc_wcpagc (WCPAGC *a)
{
delete[] (a->abs_ring);
delete[] (a->ring);
}
WCPAGC* WCPAGC::create_wcpagc (
int run,
int mode,
int pmode,
float* in,
float* out,
int io_buffsize,
int sample_rate,
double tau_attack,
double tau_decay,
int n_tau,
double max_gain,
double var_gain,
double fixed_gain,
double max_input,
double out_targ,
double tau_fast_backaverage,
double tau_fast_decay,
double pop_ratio,
int hang_enable,
double tau_hang_backmult,
double hangtime,
double hang_thresh,
double tau_hang_decay
)
{
WCPAGC *a = new WCPAGC;
//initialize per call parameters
a->run = run;
a->mode = mode;
a->pmode = pmode;
a->in = in;
a->out = out;
a->io_buffsize = io_buffsize;
a->sample_rate = (double) sample_rate;
a->tau_attack = tau_attack;
a->tau_decay = tau_decay;
a->n_tau = n_tau;
a->max_gain = max_gain;
a->var_gain = var_gain;
a->fixed_gain = fixed_gain;
a->max_input = max_input;
a->out_targ = out_targ;
a->tau_fast_backaverage = tau_fast_backaverage;
a->tau_fast_decay = tau_fast_decay;
a->pop_ratio = pop_ratio;
a->hang_enable = hang_enable;
a->tau_hang_backmult = tau_hang_backmult;
a->hangtime = hangtime;
a->hang_thresh = hang_thresh;
a->tau_hang_decay = tau_hang_decay;
calc_wcpagc (a);
return a;
}
void WCPAGC::loadWcpAGC (WCPAGC *a)
{
double tmp;
//calculate internal parameters
a->attack_buffsize = (int)ceil(a->sample_rate * a->n_tau * a->tau_attack);
a->in_index = a->attack_buffsize + a->out_index;
a->attack_mult = 1.0 - exp(-1.0 / (a->sample_rate * a->tau_attack));
a->decay_mult = 1.0 - exp(-1.0 / (a->sample_rate * a->tau_decay));
a->fast_decay_mult = 1.0 - exp(-1.0 / (a->sample_rate * a->tau_fast_decay));
a->fast_backmult = 1.0 - exp(-1.0 / (a->sample_rate * a->tau_fast_backaverage));
a->onemfast_backmult = 1.0 - a->fast_backmult;
a->out_target = a->out_targ * (1.0 - exp(-(double)a->n_tau)) * 0.9999;
a->min_volts = a->out_target / (a->var_gain * a->max_gain);
a->inv_out_target = 1.0 / a->out_target;
tmp = log10(a->out_target / (a->max_input * a->var_gain * a->max_gain));
if (tmp == 0.0)
tmp = 1e-16;
a->slope_constant = (a->out_target * (1.0 - 1.0 / a->var_gain)) / tmp;
a->inv_max_input = 1.0 / a->max_input;
tmp = pow (10.0, (a->hang_thresh - 1.0) / 0.125);
a->hang_level = (a->max_input * tmp + (a->out_target /
(a->var_gain * a->max_gain)) * (1.0 - tmp)) * 0.637;
a->hang_backmult = 1.0 - exp(-1.0 / (a->sample_rate * a->tau_hang_backmult));
a->onemhang_backmult = 1.0 - a->hang_backmult;
a->hang_decay_mult = 1.0 - exp(-1.0 / (a->sample_rate * a->tau_hang_decay));
}
void WCPAGC::destroy_wcpagc (WCPAGC *a)
{
decalc_wcpagc (a);
delete (a);
}
void WCPAGC::flush_wcpagc (WCPAGC *a)
{
memset ((void *)a->ring, 0, sizeof(double) * RB_SIZE * 2);
a->ring_max = 0.0;
memset ((void *)a->abs_ring, 0, sizeof(double)* RB_SIZE);
}
void WCPAGC::xwcpagc (WCPAGC *a)
{
int i, j, k;
double mult;
if (a->run)
{
if (a->mode == 0)
{
for (i = 0; i < a->io_buffsize; i++)
{
a->out[2 * i + 0] = a->fixed_gain * a->in[2 * i + 0];
a->out[2 * i + 1] = a->fixed_gain * a->in[2 * i + 1];
}
return;
}
for (i = 0; i < a->io_buffsize; i++)
{
if (++a->out_index >= a->ring_buffsize)
a->out_index -= a->ring_buffsize;
if (++a->in_index >= a->ring_buffsize)
a->in_index -= a->ring_buffsize;
a->out_sample[0] = a->ring[2 * a->out_index + 0];
a->out_sample[1] = a->ring[2 * a->out_index + 1];
a->abs_out_sample = a->abs_ring[a->out_index];
double xr = a->ring[2 * a->in_index + 0] = a->in[2 * i + 0];
double xi = a->ring[2 * a->in_index + 1] = a->in[2 * i + 1];
if (a->pmode == 0)
a->abs_ring[a->in_index] = std::max(fabs(xr), fabs(xi));
else
a->abs_ring[a->in_index] = sqrt(xr*xr + xi*xi);
a->fast_backaverage = a->fast_backmult * a->abs_out_sample + a->onemfast_backmult * a->fast_backaverage;
a->hang_backaverage = a->hang_backmult * a->abs_out_sample + a->onemhang_backmult * a->hang_backaverage;
if ((a->abs_out_sample >= a->ring_max) && (a->abs_out_sample > 0.0))
{
a->ring_max = 0.0;
k = a->out_index;
for (j = 0; j < a->attack_buffsize; j++)
{
if (++k == a->ring_buffsize)
k = 0;
if (a->abs_ring[k] > a->ring_max)
a->ring_max = a->abs_ring[k];
}
}
if (a->abs_ring[a->in_index] > a->ring_max)
a->ring_max = a->abs_ring[a->in_index];
if (a->hang_counter > 0)
--a->hang_counter;
switch (a->state)
{
case 0:
{
if (a->ring_max >= a->volts)
{
a->volts += (a->ring_max - a->volts) * a->attack_mult;
}
else
{
if (a->volts > a->pop_ratio * a->fast_backaverage)
{
a->state = 1;
a->volts += (a->ring_max - a->volts) * a->fast_decay_mult;
}
else
{
if (a->hang_enable && (a->hang_backaverage > a->hang_level))
{
a->state = 2;
a->hang_counter = (int)(a->hangtime * a->sample_rate);
a->decay_type = 1;
}
else
{
a->state = 3;
a->volts += (a->ring_max - a->volts) * a->decay_mult;
a->decay_type = 0;
}
}
}
break;
}
case 1:
{
if (a->ring_max >= a->volts)
{
a->state = 0;
a->volts += (a->ring_max - a->volts) * a->attack_mult;
}
else
{
if (a->volts > a->save_volts)
{
a->volts += (a->ring_max - a->volts) * a->fast_decay_mult;
}
else
{
if (a->hang_counter > 0)
{
a->state = 2;
}
else
{
if (a->decay_type == 0)
{
a->state = 3;
a->volts += (a->ring_max - a->volts) * a->decay_mult;
}
else
{
a->state = 4;
a->volts += (a->ring_max - a->volts) * a->hang_decay_mult;
}
}
}
}
break;
}
case 2:
{
if (a->ring_max >= a->volts)
{
a->state = 0;
a->save_volts = a->volts;
a->volts += (a->ring_max - a->volts) * a->attack_mult;
}
else
{
if (a->hang_counter == 0)
{
a->state = 4;
a->volts += (a->ring_max - a->volts) * a->hang_decay_mult;
}
}
break;
}
case 3:
{
if (a->ring_max >= a->volts)
{
a->state = 0;
a->save_volts = a->volts;
a->volts += (a->ring_max - a->volts) * a->attack_mult;
}
else
{
a->volts += (a->ring_max - a->volts) * a->decay_mult;
}
break;
}
case 4:
{
if (a->ring_max >= a->volts)
{
a->state = 0;
a->save_volts = a->volts;
a->volts += (a->ring_max - a->volts) * a->attack_mult;
}
else
{
a->volts += (a->ring_max - a->volts) * a->hang_decay_mult;
}
break;
}
}
if (a->volts < a->min_volts)
a->volts = a->min_volts;
a->gain = a->volts * a->inv_out_target;
mult = (a->out_target - a->slope_constant * std::min (0.0, log10(a->inv_max_input * a->volts))) / a->volts;
a->out[2 * i + 0] = a->out_sample[0] * mult;
a->out[2 * i + 1] = a->out_sample[1] * mult;
}
}
else if (a->out != a->in)
{
std::copy(a->in, a->in + a->io_buffsize * 2, a->out);
}
}
void WCPAGC::setBuffers_wcpagc (WCPAGC *a, float* in, float* out)
{
a->in = in;
a->out = out;
}
void WCPAGC::setSamplerate_wcpagc (WCPAGC *a, int rate)
{
decalc_wcpagc (a);
a->sample_rate = rate;
calc_wcpagc (a);
}
void WCPAGC::setSize_wcpagc (WCPAGC *a, int size)
{
decalc_wcpagc (a);
a->io_buffsize = size;
calc_wcpagc (a);
}
/********************************************************************************************************
* *
* RXA Properties *
* *
********************************************************************************************************/
void WCPAGC::SetAGCMode (RXA& rxa, int mode)
{
switch (mode)
{
case 0: //agcOFF
rxa.agc.p->mode = 0;
loadWcpAGC ( rxa.agc.p );
break;
case 1: //agcLONG
rxa.agc.p->mode = 1;
rxa.agc.p->hangtime = 2.000;
rxa.agc.p->tau_decay = 2.000;
loadWcpAGC ( rxa.agc.p );
break;
case 2: //agcSLOW
rxa.agc.p->mode = 2;
rxa.agc.p->hangtime = 1.000;
rxa.agc.p->tau_decay = 0.500;
loadWcpAGC ( rxa.agc.p );
break;
case 3: //agcMED
rxa.agc.p->mode = 3;
rxa.agc.p->hang_thresh = 1.0;
rxa.agc.p->hangtime = 0.000;
rxa.agc.p->tau_decay = 0.250;
loadWcpAGC ( rxa.agc.p );
break;
case 4: //agcFAST
rxa.agc.p->mode = 4;
rxa.agc.p->hang_thresh = 1.0;
rxa.agc.p->hangtime = 0.000;
rxa.agc.p->tau_decay = 0.050;
loadWcpAGC ( rxa.agc.p );
break;
default:
rxa.agc.p->mode = 5;
break;
}
}
void WCPAGC::SetAGCAttack (RXA& rxa, int attack)
{
rxa.agc.p->tau_attack = (float)attack / 1000.0;
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::SetAGCDecay (RXA& rxa, int decay)
{
rxa.agc.p->tau_decay = (float)decay / 1000.0;
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::SetAGCHang (RXA& rxa, int hang)
{
rxa.agc.p->hangtime = (float)hang / 1000.0;
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::GetAGCHangLevel(RXA& rxa, double *hangLevel)
//for line on bandscope
{
*hangLevel = 20.0 * log10( rxa.agc.p->hang_level / 0.637 );
}
void WCPAGC::SetAGCHangLevel(RXA& rxa, double hangLevel)
//for line on bandscope
{
double convert, tmp;
if (rxa.agc.p->max_input > rxa.agc.p->min_volts)
{
convert = pow (10.0, hangLevel / 20.0);
tmp = std::max(1e-8, (convert - rxa.agc.p->min_volts) / (rxa.agc.p->max_input - rxa.agc.p->min_volts));
rxa.agc.p->hang_thresh = 1.0 + 0.125 * log10 (tmp);
}
else
rxa.agc.p->hang_thresh = 1.0;
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::GetAGCHangThreshold(RXA& rxa, int *hangthreshold)
//for slider in setup
{
*hangthreshold = (int) (100.0 * rxa.agc.p->hang_thresh);
}
void WCPAGC::SetAGCHangThreshold (RXA& rxa, int hangthreshold)
//For slider in setup
{
rxa.agc.p->hang_thresh = (double) hangthreshold / 100.0;
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::GetAGCThresh(RXA& rxa, double *thresh, double size, double rate)
//for line on bandscope.
{
double noise_offset;
noise_offset = 10.0 * log10((rxa.nbp0.p->fhigh - rxa.nbp0.p->flow) * size / rate);
*thresh = 20.0 * log10( rxa.agc.p->min_volts ) - noise_offset;
}
void WCPAGC::SetAGCThresh(RXA& rxa, double thresh, double size, double rate)
//for line on bandscope
{
double noise_offset;
noise_offset = 10.0 * log10((rxa.nbp0.p->fhigh - rxa.nbp0.p->flow) * size / rate);
rxa.agc.p->max_gain = rxa.agc.p->out_target / (rxa.agc.p->var_gain * pow (10.0, (thresh + noise_offset) / 20.0));
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::GetAGCTop(RXA& rxa, double *max_agc)
//for AGC Max Gain in setup
{
*max_agc = 20 * log10 (rxa.agc.p->max_gain);
}
void WCPAGC::SetAGCTop (RXA& rxa, double max_agc)
//for AGC Max Gain in setup
{
rxa.agc.p->max_gain = pow (10.0, (double) max_agc / 20.0);
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::SetAGCSlope (RXA& rxa, int slope)
{
rxa.agc.p->var_gain = pow (10.0, (double) slope / 20.0 / 10.0);
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::SetAGCFixed (RXA& rxa, double fixed_agc)
{
rxa.agc.p->fixed_gain = pow (10.0, (double) fixed_agc / 20.0);
loadWcpAGC ( rxa.agc.p );
}
void WCPAGC::SetAGCMaxInputLevel (RXA& rxa, double level)
{
rxa.agc.p->max_input = level;
loadWcpAGC ( rxa.agc.p );
}
/********************************************************************************************************
* *
* TXA Properties *
* *
********************************************************************************************************/
void WCPAGC::SetALCSt (TXA& txa, int state)
{
txa.alc.p->run = state;
}
void WCPAGC::SetALCAttack (TXA& txa, int attack)
{
txa.alc.p->tau_attack = (double) attack / 1000.0;
loadWcpAGC(txa.alc.p);
}
void WCPAGC::SetALCDecay (TXA& txa, int decay)
{
txa.alc.p->tau_decay = (double) decay / 1000.0;
loadWcpAGC(txa.alc.p);
}
void WCPAGC::SetALCHang (TXA& txa, int hang)
{
txa.alc.p->hangtime = (double) hang / 1000.0;
loadWcpAGC(txa.alc.p);
}
void WCPAGC::SetALCMaxGain (TXA& txa, double maxgain)
{
txa.alc.p->max_gain = pow (10.0,(double) maxgain / 20.0);
loadWcpAGC(txa.alc.p);
}
void WCPAGC::SetLevelerSt (TXA& txa, int state)
{
txa.leveler.p->run = state;
}
void WCPAGC::SetLevelerAttack (TXA& txa, int attack)
{
txa.leveler.p->tau_attack = (double) attack / 1000.0;
loadWcpAGC(txa.leveler.p);
}
void WCPAGC::SetLevelerDecay (TXA& txa, int decay)
{
txa.leveler.p->tau_decay = (double) decay / 1000.0;
loadWcpAGC(txa.leveler.p);
}
void WCPAGC::SetLevelerHang (TXA& txa, int hang)
{
txa.leveler.p->hangtime = (double) hang / 1000.0;
loadWcpAGC(txa.leveler.p);
}
void WCPAGC::SetLevelerTop (TXA& txa, double maxgain)
{
txa.leveler.p->max_gain = pow (10.0,(double) maxgain / 20.0);
loadWcpAGC(txa.leveler.p);
}
} // namespace WDSP
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