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mirror of https://github.com/f4exb/sdrangel.git synced 2024-11-26 01:39:05 -05:00
sdrangel/wdsp/osctrl.cpp
2024-07-13 23:59:46 +02:00

157 lines
4.8 KiB
C++

/* osctrl.c
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2014, 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
*/
// This file is part of the implementation of the Overshoot Controller from
// "Controlled Envelope Single Sideband" by David L. Hershberger, W9GR, in
// the November/December 2014 issue of QEX.
#include "comm.hpp"
#include "osctrl.hpp"
#include "TXA.hpp"
namespace WDSP {
void OSCTRL::calc_osctrl (OSCTRL *a)
{
a->pn = (int)((0.3 / a->bw) * a->rate + 0.5);
if ((a->pn & 1) == 0) a->pn += 1;
if (a->pn < 3) a->pn = 3;
a->dl_len = a->pn >> 1;
a->dl = new float[a->pn * 2]; // (float *) malloc0 (a->pn * sizeof (complex));
a->dlenv = new float[a->pn]; // (float *) malloc0 (a->pn * sizeof (float));
a->in_idx = 0;
a->out_idx = a->in_idx + a->dl_len;
a->max_env = 0.0;
}
void OSCTRL::decalc_osctrl (OSCTRL *a)
{
delete[] (a->dlenv);
delete[] (a->dl);
}
OSCTRL* OSCTRL::create_osctrl (
int run,
int size,
float* inbuff,
float* outbuff,
int rate,
float osgain
)
{
OSCTRL *a = new OSCTRL;
a->run = run;
a->size = size;
a->inbuff = inbuff;
a->outbuff = outbuff;
a->rate = rate;
a->osgain = osgain;
a->bw = 3000.0;
calc_osctrl (a);
return a;
}
void OSCTRL::destroy_osctrl (OSCTRL *a)
{
decalc_osctrl (a);
delete (a);
}
void OSCTRL::flush_osctrl (OSCTRL *a)
{
memset (a->dl, 0, a->dl_len * sizeof (wcomplex));
memset (a->dlenv, 0, a->pn * sizeof (float));
}
void OSCTRL::xosctrl (OSCTRL *a)
{
if (a->run)
{
int i, j;
float divisor;
for (i = 0; i < a->size; i++)
{
a->dl[2 * a->in_idx + 0] = a->inbuff[2 * i + 0]; // put sample in delay line
a->dl[2 * a->in_idx + 1] = a->inbuff[2 * i + 1];
a->env_out = a->dlenv[a->in_idx]; // take env out of delay line
a->dlenv[a->in_idx] = sqrt (a->inbuff[2 * i + 0] * a->inbuff[2 * i + 0] // put env in delay line
+ a->inbuff[2 * i + 1] * a->inbuff[2 * i + 1]);
if (a->dlenv[a->in_idx] > a->max_env) a->max_env = a->dlenv[a->in_idx];
if (a->env_out >= a->max_env && a->env_out > 0.0) // run the buffer
{
a->max_env = 0.0;
for (j = 0; j < a->pn; j++)
if (a->dlenv[j] > a->max_env) a->max_env = a->dlenv[j];
}
if (a->max_env > 1.0) divisor = 1.0 + a->osgain * (a->max_env - 1.0);
else divisor = 1.0;
a->outbuff[2 * i + 0] = a->dl[2 * a->out_idx + 0] / divisor; // output sample
a->outbuff[2 * i + 1] = a->dl[2 * a->out_idx + 1] / divisor;
if (--a->in_idx < 0) a->in_idx += a->pn;
if (--a->out_idx < 0) a->out_idx += a->pn;
}
}
else if (a->inbuff != a->outbuff)
memcpy (a->outbuff, a->inbuff, a->size * sizeof (wcomplex));
}
void OSCTRL::setBuffers_osctrl (OSCTRL *a, float* in, float* out)
{
a->inbuff = in;
a->outbuff = out;
}
void OSCTRL::setSamplerate_osctrl (OSCTRL *a, int rate)
{
decalc_osctrl (a);
a->rate = rate;
calc_osctrl (a);
}
void OSCTRL::setSize_osctrl (OSCTRL *a, int size)
{
a->size = size;
flush_osctrl (a);
}
/********************************************************************************************************
* *
* TXA Properties *
* *
********************************************************************************************************/
void OSCTRL::SetosctrlRun (TXA& txa, int run)
{
if (txa.osctrl.p->run != run)
{
txa.osctrl.p->run = run;
TXA::SetupBPFilters (txa);
}
}
} // namespace WDSP