sdrangel/wdsp/fmsq.hpp

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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
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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 wdsp_fmsq_h
#define wdsp_fmsq_h
#include "export.h"
namespace WDSP {
class FIRCORE;
class RXA;
class WDSP_API FMSQ
{
public:
int run; // 0 if squelch system is OFF; 1 if it's ON
int size; // size of input/output buffers
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float* insig; // squelch input signal buffer
float* outsig; // squelch output signal buffer
float* trigger; // buffer used to trigger mute/unmute (may be same as input; matches timing of input buffer)
double rate; // sample rate
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float* noise;
double fc; // corner frequency for sig / noise detection
double* pllpole; // pointer to pole frequency of the fm demodulator pll
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float F[4];
float 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;
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int state; // state machine control
int count;
double tup;
double tdown;
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int ntup;
int ntdown;
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float* cup;
float* cdown;
double tail_thresh;
double unmute_thresh;
double min_tail;
double max_tail;
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int ready;
double ramp;
double rstep;
double tdelay;
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int nc;
int mp;
FIRCORE *p;
static FMSQ* create_fmsq (
int run,
int size,
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float* insig,
float* outsig,
float* trigger,
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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,
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int nc,
int mp
);
static void destroy_fmsq (FMSQ *a);
static void flush_fmsq (FMSQ *a);
static void xfmsq (FMSQ *a);
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static void setBuffers_fmsq (FMSQ *a, float* in, float* out, float* trig);
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static void setSamplerate_fmsq (FMSQ *a, int rate);
static void setSize_fmsq (FMSQ *a, int size);
// RXA Properties
static void SetFMSQRun (RXA& rxa, int run);
static void SetFMSQThreshold (RXA& rxa, double threshold);
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static void SetFMSQNC (RXA& rxa, int nc);
static void SetFMSQMP (RXA& rxa, int mp);
private:
static void calc_fmsq (FMSQ *a);
static void decalc_fmsq (FMSQ *a);
};
} // namespace WDSP
#endif