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2026-08-25 17:27:33 +00:00 · 2026-06-01 15:58:45 +03:00
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+/*	ammod.h
+
+This file is part of a program that implements a Software-Defined Radio.
+
+Copyright (C) 2013, 2017 Warren Pratt, NR0V
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+The author can be reached by email at
+
+warren@wpratt.com
+
+*/
+
+#include "comm.h"
+
+AMMOD create_ammod (int run, int mode, int size, double* in, double* out, double c_level)
+{
+	AMMOD a = (AMMOD) malloc0 (sizeof (ammod));
+	a->run = run;
+	a->mode = mode;
+	a->size = size;
+	a->in = in;
+	a->out = out;
+	a->c_level = c_level;
+	a->a_level = 1.0 - a->c_level;
+	a->mult = 1.0 / sqrt (2.0);
+	return a;
+}
+
+void destroy_ammod (AMMOD a)
+{
+	_aligned_free (a);
+}
+
+void flush_ammod (AMMOD a)
+{
+
+}
+
+void xammod (AMMOD a)
+{
+	if (a->run)
+	{
+		int i;
+		switch (a->mode)
+		{
+		case 0: // AM
+			for (i = 0; i < a->size; i++)
+				a->out[2 * i + 0] = a->out[2 * i + 1] = a->mult * (a->c_level + a->a_level * a->in[2 * i + 0]);
+			break;
+		case 1: // DSB
+			for (i = 0; i < a->size; i++)
+				a->out[2 * i + 0] = a->out[2 * i + 1] = a->mult * a->in[2 * i + 0];
+			break;
+		case 2: // SSB w/Carrier
+			for (i = 0; i < a->size; i++)
+			{
+				a->out[2 * i + 0] = a->mult * a->c_level + a->a_level * a->in[2 * i + 0];
+				a->out[2 * i + 1] = a->mult * a->c_level + a->a_level * a->in[2 * i + 1];
+			}
+			break;
+		}
+	}
+	else if (a->in != a->out)
+		memcpy (a->out, a->in, a->size * sizeof (complex));
+}
+
+void setBuffers_ammod (AMMOD a, double* in, double* out)
+{
+	a->in = in;
+	a->out = out;
+}
+
+void setSamplerate_ammod (AMMOD a, int rate)
+{
+
+}
+
+void setSize_ammod (AMMOD a, int size)
+{
+	a->size = size;
+}
+
+/********************************************************************************************************
+*																										*
+*											TXA Properties												*
+*																										*
+********************************************************************************************************/
+
+PORT void
+SetTXAAMCarrierLevel (int channel, double c_level)
+{
+	EnterCriticalSection (&ch[channel].csDSP);
+	txa[channel].ammod.p->c_level = c_level;
+	txa[channel].ammod.p->a_level = 1.0 - c_level;
+	LeaveCriticalSection (&ch[channel].csDSP);
+}