111 lines
2.7 KiB
C
111 lines
2.7 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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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 "comm.h"
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AMMOD create_ammod (int run, int mode, int size, double* in, double* out, double c_level)
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{
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AMMOD a = (AMMOD) malloc0 (sizeof (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 destroy_ammod (AMMOD a)
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{
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_aligned_free (a);
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}
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void flush_ammod (AMMOD a)
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{
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}
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void 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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memcpy (a->out, a->in, a->size * sizeof (complex));
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}
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void setBuffers_ammod (AMMOD a, double* in, double* 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 setSamplerate_ammod (AMMOD a, int rate)
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{
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}
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void 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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PORT void
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SetTXAAMCarrierLevel (int channel, double c_level)
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{
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EnterCriticalSection (&ch[channel].csDSP);
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txa[channel].ammod.p->c_level = c_level;
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txa[channel].ammod.p->a_level = 1.0 - c_level;
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LeaveCriticalSection (&ch[channel].csDSP);
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}
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