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sdrangel/wdsp/fmsq.hpp
2024-08-03 11:05:12 +02:00

135 lines
3.5 KiB
C++

/* 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 <array>
#include <vector>
#include "export.h"
namespace WDSP {
class FIRCORE;
class WDSP_API FMSQ
{
public:
enum class FMSQState
{
MUTED,
INCREASE,
UNMUTED,
TAIL,
DECREASE
};
int run; // 0 if squelch system is OFF; 1 if it's ON
int size; // size of input/output buffers
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
std::vector<float> noise;
double fc; // corner frequency for sig / noise detection
double* pllpole; // pointer to pole frequency of the fm demodulator pll
std::array<float, 4> F;
std::array<float, 4> G;
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;
FMSQState state; // state machine control
int count;
double tup;
double tdown;
int ntup;
int ntdown;
std::vector<double> cup;
std::vector<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(
int _run,
int _size,
float* _insig,
float* _outsig,
float* _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
);
FMSQ(const FMSQ&) = delete;
FMSQ& operator=(const FMSQ& other) = delete;
~FMSQ();
void flush();
void execute();
void setBuffers(float* in, float* out, float* trig);
void setSamplerate(int rate);
void setSize(int size);
// Public Properties
void setRun(int run);
void setThreshold(double threshold);
void setNC(int nc);
void setMP(int mp);
private:
void calc();
void decalc();
};
} // namespace WDSP
#endif