kopia lustrzana https://github.com/f4exb/sdrangel
117 wiersze
3.2 KiB
C++
117 wiersze
3.2 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::create_ammod (int run, int mode, int size, float* in, float* out, float c_level)
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{
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AMMOD *a = new AMMOD;
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a->run = run;
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a->mode = mode;
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a->size = size;
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a->in = in;
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a->out = out;
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a->c_level = c_level;
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a->a_level = 1.0 - a->c_level;
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a->mult = 1.0 / sqrt (2.0);
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return a;
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}
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void AMMOD::destroy_ammod(AMMOD *a)
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{
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delete a;
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}
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void AMMOD::flush_ammod(AMMOD *)
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{
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}
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void AMMOD::xammod(AMMOD *a)
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{
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if (a->run)
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{
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int i;
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switch (a->mode)
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{
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case 0: // AM
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for (i = 0; i < a->size; i++)
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a->out[2 * i + 0] = a->out[2 * i + 1] = a->mult * (a->c_level + a->a_level * a->in[2 * i + 0]);
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break;
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case 1: // DSB
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for (i = 0; i < a->size; i++)
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a->out[2 * i + 0] = a->out[2 * i + 1] = a->mult * a->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 < a->size; i++)
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{
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a->out[2 * i + 0] = a->mult * a->c_level + a->a_level * a->in[2 * i + 0];
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a->out[2 * i + 1] = a->mult * a->c_level + a->a_level * a->in[2 * i + 1];
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}
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break;
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}
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}
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else if (a->in != a->out)
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std::copy( a->in, a->in + a->size * 2, a->out);
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}
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void AMMOD::setBuffers_ammod(AMMOD *a, float* in, float* out)
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{
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a->in = in;
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a->out = out;
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}
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void AMMOD::setSamplerate_ammod(AMMOD *, int)
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{
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}
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void AMMOD::setSize_ammod(AMMOD *a, int size)
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{
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a->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 (TXA& txa, float c_level)
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{
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txa.ammod->c_level = c_level;
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txa.ammod->a_level = 1.0 - c_level;
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}
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} // namespace WDSP
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