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93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2015 Edouard Griffiths, F4EXB. //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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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 V3 for more details. //
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// //
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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, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_GPL_DSP_AFSQUELCH_H_
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#define INCLUDE_GPL_DSP_AFSQUELCH_H_
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#include "dsp/dsptypes.h"
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#include "dsp/movingaverage.h"
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#include "export.h"
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/** AFSquelch: AF squelch class based on the Modified Goertzel
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* algorithm.
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*/
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class SDRBASE_API AFSquelch {
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public:
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// constructor with default values
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AFSquelch();
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virtual ~AFSquelch();
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// setup the basic parameters and coefficients
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void setCoefficients(
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unsigned int N, //!< the algorithm "block" size
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unsigned int nbAvg, //!< averaging size
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unsigned int sampleRate, //!< input signal sample rate
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unsigned int samplesAttack, //!< number of results before squelch opens
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unsigned int samplesDecay, //!< number of results keeping squelch open
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const double *tones); //!< center frequency of tones tested
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// set the detection threshold
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void setThreshold(double _threshold);
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// analyze a sample set and optionally filter
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// the tone frequencies.
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bool analyze(double sample); // input signal sample
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bool evaluate(); // evaluate result
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// get the tone set
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const double *getToneSet() const
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{
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return m_toneSet;
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}
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bool open() const {
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return m_isOpen;
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}
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void reset(); // reset the analysis algorithm
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protected:
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void feedback(double sample);
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void feedForward();
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private:
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unsigned int m_nbAvg; //!< number of power samples taken for moving average
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unsigned int m_N;
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unsigned int m_sampleRate;
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unsigned int m_samplesProcessed;
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unsigned int m_samplesAvgProcessed;
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unsigned int m_maxPowerIndex;
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unsigned int m_nTones;
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unsigned int m_samplesAttack;
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unsigned int m_attackCount;
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unsigned int m_samplesDecay;
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unsigned int m_decayCount;
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unsigned int m_squelchCount;
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bool m_isOpen;
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double m_threshold;
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double *m_k;
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double *m_coef;
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double *m_toneSet;
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double *m_u0;
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double *m_u1;
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double *m_power;
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std::vector<MovingAverage<double> > m_movingAverages;
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};
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#endif /* INCLUDE_GPL_DSP_CTCSSDETECTOR_H_ */
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