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2026-08-25 17:27:33 +00:00 · 2026-06-01 15:58:45 +03:00
commit 89c8a0e2b5
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+/*	osctrl.c
+
+This file is part of a program that implements a Software-Defined Radio.
+
+Copyright (C) 2014, 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
+
+*/
+
+// This file is part of the implementation of the Overshoot Controller from
+// "Controlled Envelope Single Sideband" by David L. Hershberger, W9GR, in
+// the November/December 2014 issue of QEX.
+
+#include "comm.h"
+
+void calc_osctrl (OSCTRL a)
+{
+	a->pn = (int)((0.3 / a->bw) * a->rate + 0.5);
+	if ((a->pn & 1) == 0) a->pn += 1;
+	if (a->pn < 3) a->pn = 3;
+	a->dl_len = a->pn >> 1;
+	a->dl	 = (double *) malloc0 (a->pn * sizeof (complex));
+	a->dlenv = (double *) malloc0 (a->pn * sizeof (double));
+	a->in_idx = 0;
+	a->out_idx = a->in_idx + a->dl_len;
+	a->max_env = 0.0;
+}
+
+void decalc_osctrl (OSCTRL a)
+{
+	_aligned_free (a->dlenv);
+	_aligned_free (a->dl);
+}
+
+OSCTRL create_osctrl (
+				int run,
+				int size,
+				double* inbuff,
+				double* outbuff,
+				int rate,
+				double osgain )
+{
+	OSCTRL a = (OSCTRL) malloc0 (sizeof (osctrl));
+	a->run = run;
+	a->size = size;
+	a->inbuff = inbuff;
+	a->outbuff = outbuff;
+	a->rate = rate;
+	a->osgain = osgain;
+	a->bw = 3000.0;
+	calc_osctrl (a);
+	return a;
+}
+
+void destroy_osctrl (OSCTRL a)
+{
+	decalc_osctrl (a);
+	_aligned_free (a);
+}
+
+void flush_osctrl (OSCTRL a)
+{
+	memset (a->dl,	  0, a->dl_len * sizeof (complex));
+	memset (a->dlenv, 0, a->pn	   * sizeof (double));
+}
+
+void xosctrl (OSCTRL a)
+{
+	if (a->run)
+	{
+		int i, j;
+		double divisor;
+		for (i = 0; i < a->size; i++)
+		{
+			a->dl[2 * a->in_idx + 0] = a->inbuff[2 * i + 0];							// put sample in delay line
+			a->dl[2 * a->in_idx + 1] = a->inbuff[2 * i + 1];
+			a->env_out = a->dlenv[a->in_idx];											// take env out of delay line
+			a->dlenv[a->in_idx] = sqrt (a->inbuff[2 * i + 0] * a->inbuff[2 * i + 0]		// put env in delay line
+									  + a->inbuff[2 * i + 1] * a->inbuff[2 * i + 1]);
+			if (a->dlenv[a->in_idx]	 >	a->max_env) a->max_env = a->dlenv[a->in_idx];
+			if (a->env_out >= a->max_env && a->env_out > 0.0)							// run the buffer
+			{
+				a->max_env = 0.0;
+				for (j = 0; j < a->pn; j++)
+					if (a->dlenv[j] > a->max_env) a->max_env = a->dlenv[j];
+			}
+			if (a->max_env > 1.0) divisor = 1.0 + a->osgain * (a->max_env - 1.0);
+			else				  divisor = 1.0;
+			a->outbuff[2 * i + 0] = a->dl[2 * a->out_idx + 0] / divisor;				// output sample
+			a->outbuff[2 * i + 1] = a->dl[2 * a->out_idx + 1] / divisor;
+			if (--a->in_idx	 < 0) a->in_idx	 += a->pn;
+			if (--a->out_idx < 0) a->out_idx += a->pn;
+		}
+	}
+	else if (a->inbuff != a->outbuff)
+		memcpy (a->outbuff, a->inbuff, a->size * sizeof (complex));
+}
+
+void setBuffers_osctrl (OSCTRL a, double* in, double* out)
+{
+	a->inbuff = in;
+	a->outbuff = out;
+}
+
+void setSamplerate_osctrl (OSCTRL a, int rate)
+{
+	decalc_osctrl (a);
+	a->rate = rate;
+	calc_osctrl (a);
+}
+
+void setSize_osctrl (OSCTRL a, int size)
+{
+	a->size = size;
+	flush_osctrl (a);
+}
+
+/********************************************************************************************************
+*																										*
+*											TXA Properties												*
+*																										*
+********************************************************************************************************/
+
+PORT
+void SetTXAosctrlRun (int channel, int run)
+{
+	if (txa[channel].osctrl.p->run != run)
+	{
+		EnterCriticalSection (&ch[channel].csDSP);
+		txa[channel].osctrl.p->run = run;
+		TXASetupBPFilters (channel);
+		LeaveCriticalSection (&ch[channel].csDSP);
+	}
+}