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