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126 lines
3.4 KiB
C++
126 lines
3.4 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()
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{
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pn = (int)((0.3 / bw) * rate + 0.5);
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if ((pn & 1) == 0) pn += 1;
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if (pn < 3) pn = 3;
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dl_len = pn >> 1;
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dl.resize(pn * 2);
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dlenv.resize(pn);
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in_idx = 0;
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out_idx = in_idx + dl_len;
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max_env = 0.0;
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}
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OSCTRL::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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double _osgain
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) :
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run(_run),
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size(_size),
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inbuff(_inbuff),
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outbuff(_outbuff),
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rate(_rate),
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osgain(_osgain)
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{
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bw = 3000.0;
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calc();
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}
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void OSCTRL::flush()
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{
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std::fill(dl.begin(), dl.end(), 0);
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std::fill(dlenv.begin(), dlenv.end(), 0);
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}
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void OSCTRL::execute()
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{
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if (run)
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{
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double divisor;
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for (int i = 0; i < size; i++)
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{
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dl[2 * in_idx + 0] = inbuff[2 * i + 0]; // put sample in delay line
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dl[2 * in_idx + 1] = inbuff[2 * i + 1];
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env_out = dlenv[in_idx]; // take env out of delay line
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dlenv[in_idx] = sqrt (inbuff[2 * i + 0] * inbuff[2 * i + 0] // put env in delay line
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+ inbuff[2 * i + 1] * inbuff[2 * i + 1]);
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if (dlenv[in_idx] > max_env) max_env = dlenv[in_idx];
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if (env_out >= max_env && env_out > 0.0) // run the buffer
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{
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max_env = 0.0;
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for (int j = 0; j < pn; j++)
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if (dlenv[j] > max_env) max_env = dlenv[j];
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}
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if (max_env > 1.0) divisor = 1.0 + osgain * (max_env - 1.0);
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else divisor = 1.0;
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outbuff[2 * i + 0] = (float) (dl[2 * out_idx + 0] / divisor); // output sample
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outbuff[2 * i + 1] = (float) (dl[2 * out_idx + 1] / divisor);
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if (--in_idx < 0) in_idx += pn;
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if (--out_idx < 0) out_idx += pn;
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}
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}
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else if (inbuff != outbuff)
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std::copy(inbuff, inbuff + size * 2, outbuff);
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}
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void OSCTRL::setBuffers(float* _in, float* _out)
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{
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inbuff = _in;
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outbuff = _out;
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}
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void OSCTRL::setSamplerate(int _rate)
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{
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rate = _rate;
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calc();
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}
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void OSCTRL::setSize(int _size)
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{
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size = _size;
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flush();
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}
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} // namespace WDSP
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