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121 lines
3.4 KiB
C++
121 lines
3.4 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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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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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 wdsp_fmsq_h
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#define wdsp_fmsq_h
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#include "export.h"
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namespace WDSP {
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class FIRCORE;
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class RXA;
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class WDSP_API FMSQ
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{
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public:
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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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float* insig; // squelch input signal buffer
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float* outsig; // squelch output signal buffer
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float* trigger; // buffer used to trigger mute/unmute (may be same as input; matches timing of input buffer)
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float rate; // sample rate
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float* noise;
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float fc; // corner frequency for sig / noise detection
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float* pllpole; // pointer to pole frequency of the fm demodulator pll
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float F[4];
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float G[4];
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float avtau; // time constant for averaging noise
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float avm;
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float onem_avm;
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float avnoise;
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float longtau; // time constant for long averaging
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float longavm;
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float onem_longavm;
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float longnoise;
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int state; // state machine control
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int count;
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float tup;
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float tdown;
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int ntup;
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int ntdown;
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float* cup;
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float* cdown;
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float tail_thresh;
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float unmute_thresh;
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float min_tail;
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float max_tail;
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int ready;
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float ramp;
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float rstep;
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float tdelay;
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int nc;
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int mp;
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FIRCORE *p;
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static FMSQ* create_fmsq (
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int run,
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int size,
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float* insig,
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float* outsig,
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float* trigger,
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int rate,
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float fc,
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float* pllpole,
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float tdelay,
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float avtau,
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float longtau,
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float tup,
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float tdown,
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float tail_thresh,
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float unmute_thresh,
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float min_tail,
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float max_tail,
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int nc,
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int mp
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);
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static void destroy_fmsq (FMSQ *a);
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static void flush_fmsq (FMSQ *a);
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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);
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static void setSize_fmsq (FMSQ *a, int size);
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// RXA Properties
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static void SetFMSQRun (RXA& rxa, int run);
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static void SetFMSQThreshold (RXA& rxa, float threshold);
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static void SetFMSQNC (RXA& rxa, int nc);
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static void SetFMSQMP (RXA& rxa, int mp);
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private:
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static void calc_fmsq (FMSQ *a);
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static void decalc_fmsq (FMSQ *a);
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};
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} // namespace WDSP
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#endif
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