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fmsq.h

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+/*	fmsq.h
+
+This file is part of a program that implements a Software-Defined Radio.
+
+Copyright (C) 2013, 2016 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
+
+*/
+
+#ifndef _fmsq_h
+#define _fmsq_h
+#include "firmin.h"
+typedef struct _fmsq
+{
+	int run;							// 0 if squelch system is OFF; 1 if it's ON
+	int size;							// size of input/output buffers
+	double* insig;						// squelch input signal buffer
+	double* outsig;						// squelch output signal buffer
+	double* trigger;					// buffer used to trigger mute/unmute (may be same as input; matches timing of input buffer)
+	double rate;						// sample rate
+	double* noise;
+	double fc;							// corner frequency for sig / noise detection
+	double* pllpole;					// pointer to pole frequency of the fm demodulator pll
+	double F[4];
+	double G[4];
+	double avtau;						// time constant for averaging noise
+	double avm;						
+	double onem_avm;
+	double avnoise;
+	double longtau;						// time constant for long averaging
+	double longavm;
+	double onem_longavm;
+	double longnoise;
+	int state;							// state machine control
+	int count;
+	double tup;
+	double tdown;
+	int ntup;
+	int ntdown;
+	double* cup;
+	double* cdown;
+	double tail_thresh;
+	double unmute_thresh;
+	double min_tail;
+	double max_tail;
+	int ready;
+	double ramp;
+	double rstep;
+	double tdelay;
+	int nc;
+	int mp;
+	FIRCORE p;
+} fmsq, *FMSQ;
+
+extern FMSQ create_fmsq (int run, int size, double* insig, double* outsig, double* trigger, int rate, double fc,
+	double* pllpole, double tdelay, double avtau, double longtau, double tup, double tdown, double tail_thresh,
+	double unmute_thresh, double min_tail, double max_tail, int nc, int mp);
+
+extern void destroy_fmsq (FMSQ a);
+
+extern void flush_fmsq (FMSQ a);
+
+extern void xfmsq (FMSQ a);
+
+extern void setBuffers_fmsq (FMSQ a, double* in, double* out, double* trig);
+
+extern void setSamplerate_fmsq (FMSQ a, int rate);
+
+extern void setSize_fmsq (FMSQ a, int size);
+
+// RXA Properties
+
+extern __declspec (dllexport) void SetRXAFMSQThreshold (int channel, double threshold);
+
+extern __declspec (dllexport) void SetRXAFMSQNC (int channel, int nc);
+
+extern __declspec (dllexport) void SetRXAFMSQMP (int channel, int mp);
+
+#endif