mirror of
https://github.com/f4exb/sdrangel.git
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157 lines
4.8 KiB
C++
157 lines
4.8 KiB
C++
/* osctrl.c
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2014, 2017 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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// This file is part of the implementation of the Overshoot Controller from
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// "Controlled Envelope Single Sideband" by David L. Hershberger, W9GR, in
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// the November/December 2014 issue of QEX.
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#include "comm.hpp"
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#include "osctrl.hpp"
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#include "TXA.hpp"
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namespace WDSP {
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void OSCTRL::calc_osctrl (OSCTRL *a)
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{
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a->pn = (int)((0.3 / a->bw) * a->rate + 0.5);
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if ((a->pn & 1) == 0) a->pn += 1;
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if (a->pn < 3) a->pn = 3;
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a->dl_len = a->pn >> 1;
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a->dl = new float[a->pn * 2]; // (float *) malloc0 (a->pn * sizeof (complex));
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a->dlenv = new float[a->pn]; // (float *) malloc0 (a->pn * sizeof (float));
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a->in_idx = 0;
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a->out_idx = a->in_idx + a->dl_len;
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a->max_env = 0.0;
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}
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void OSCTRL::decalc_osctrl (OSCTRL *a)
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{
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delete[] (a->dlenv);
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delete[] (a->dl);
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}
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OSCTRL* OSCTRL::create_osctrl (
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int run,
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int size,
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float* inbuff,
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float* outbuff,
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int rate,
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float osgain
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)
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{
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OSCTRL *a = new OSCTRL;
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a->run = run;
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a->size = size;
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a->inbuff = inbuff;
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a->outbuff = outbuff;
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a->rate = rate;
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a->osgain = osgain;
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a->bw = 3000.0;
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calc_osctrl (a);
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return a;
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}
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void OSCTRL::destroy_osctrl (OSCTRL *a)
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{
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decalc_osctrl (a);
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delete (a);
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}
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void OSCTRL::flush_osctrl (OSCTRL *a)
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{
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memset (a->dl, 0, a->dl_len * sizeof (wcomplex));
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memset (a->dlenv, 0, a->pn * sizeof (float));
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}
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void OSCTRL::xosctrl (OSCTRL *a)
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{
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if (a->run)
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{
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int i, j;
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float divisor;
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for (i = 0; i < a->size; i++)
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{
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a->dl[2 * a->in_idx + 0] = a->inbuff[2 * i + 0]; // put sample in delay line
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a->dl[2 * a->in_idx + 1] = a->inbuff[2 * i + 1];
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a->env_out = a->dlenv[a->in_idx]; // take env out of delay line
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a->dlenv[a->in_idx] = sqrt (a->inbuff[2 * i + 0] * a->inbuff[2 * i + 0] // put env in delay line
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+ a->inbuff[2 * i + 1] * a->inbuff[2 * i + 1]);
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if (a->dlenv[a->in_idx] > a->max_env) a->max_env = a->dlenv[a->in_idx];
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if (a->env_out >= a->max_env && a->env_out > 0.0) // run the buffer
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{
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a->max_env = 0.0;
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for (j = 0; j < a->pn; j++)
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if (a->dlenv[j] > a->max_env) a->max_env = a->dlenv[j];
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}
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if (a->max_env > 1.0) divisor = 1.0 + a->osgain * (a->max_env - 1.0);
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else divisor = 1.0;
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a->outbuff[2 * i + 0] = a->dl[2 * a->out_idx + 0] / divisor; // output sample
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a->outbuff[2 * i + 1] = a->dl[2 * a->out_idx + 1] / divisor;
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if (--a->in_idx < 0) a->in_idx += a->pn;
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if (--a->out_idx < 0) a->out_idx += a->pn;
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}
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}
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else if (a->inbuff != a->outbuff)
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memcpy (a->outbuff, a->inbuff, a->size * sizeof (wcomplex));
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}
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void OSCTRL::setBuffers_osctrl (OSCTRL *a, float* in, float* out)
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{
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a->inbuff = in;
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a->outbuff = out;
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}
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void OSCTRL::setSamplerate_osctrl (OSCTRL *a, int rate)
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{
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decalc_osctrl (a);
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a->rate = rate;
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calc_osctrl (a);
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}
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void OSCTRL::setSize_osctrl (OSCTRL *a, int size)
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{
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a->size = size;
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flush_osctrl (a);
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}
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/********************************************************************************************************
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* *
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* TXA Properties *
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* *
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********************************************************************************************************/
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void OSCTRL::SetosctrlRun (TXA& txa, int run)
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{
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if (txa.osctrl.p->run != run)
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{
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txa.osctrl.p->run = run;
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TXA::SetupBPFilters (txa);
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}
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}
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} // namespace WDSP
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