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119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/* ammod.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2013, 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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#include <cmath>
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#include "ammod.hpp"
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#include "comm.hpp"
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#include "TXA.hpp"
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namespace WDSP {
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AMMOD::AMMOD(
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int _run,
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int _mode,
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int _size,
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float* _in,
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float* _out,
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double _c_level
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)
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{
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run = _run;
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mode = _mode;
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size = _size;
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in = _in;
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out = _out;
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c_level = _c_level;
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a_level = 1.0 - c_level;
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mult = 1.0 / sqrt (2.0);
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}
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void AMMOD::flush()
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{
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// Nothing to flush
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}
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void AMMOD::execute()
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{
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if (run)
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{
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int i;
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switch (mode)
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{
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case 0: // AM
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for (i = 0; i < size; i++)
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out[2 * i + 0] = out[2 * i + 1] = (float) (mult * (c_level + a_level * in[2 * i + 0]));
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break;
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case 1: // DSB
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for (i = 0; i < size; i++)
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out[2 * i + 0] = out[2 * i + 1] = (float) (mult * in[2 * i + 0]);
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break;
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case 2: // SSB w/Carrier
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for (i = 0; i < size; i++)
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{
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out[2 * i + 0] = (float) (mult * c_level + a_level * in[2 * i + 0]);
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out[2 * i + 1] = (float) (mult * c_level + a_level * in[2 * i + 1]);
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}
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break;
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default:
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break;
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}
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}
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else if (in != out)
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std::copy( in, in + size * 2, out);
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}
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void AMMOD::setBuffers(float* _in, float* _out)
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{
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in = _in;
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out = _out;
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}
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void AMMOD::setSamplerate(int)
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{
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// Nothing to do
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}
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void AMMOD::setSize(int _size)
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{
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size = _size;
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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 AMMOD::setAMCarrierLevel(double _c_level)
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{
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c_level = _c_level;
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a_level = 1.0 - _c_level;
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}
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} // namespace WDSP
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