mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-18 06:11:46 -05:00
93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2015 Edouard Griffiths, F4EXB. //
|
|
// //
|
|
// 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 as version 3 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 V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef INCLUDE_GPL_DSP_AFSQUELCH_H_
|
|
#define INCLUDE_GPL_DSP_AFSQUELCH_H_
|
|
|
|
#include "dsp/dsptypes.h"
|
|
#include "dsp/movingaverage.h"
|
|
#include "export.h"
|
|
|
|
/** AFSquelch: AF squelch class based on the Modified Goertzel
|
|
* algorithm.
|
|
*/
|
|
class SDRBASE_API AFSquelch {
|
|
public:
|
|
// constructor with default values
|
|
AFSquelch();
|
|
virtual ~AFSquelch();
|
|
|
|
// setup the basic parameters and coefficients
|
|
void setCoefficients(
|
|
unsigned int N, //!< the algorithm "block" size
|
|
unsigned int nbAvg, //!< averaging size
|
|
unsigned int sampleRate, //!< input signal sample rate
|
|
unsigned int samplesAttack, //!< number of results before squelch opens
|
|
unsigned int samplesDecay, //!< number of results keeping squelch open
|
|
const double *tones); //!< center frequency of tones tested
|
|
|
|
// set the detection threshold
|
|
void setThreshold(double _threshold);
|
|
|
|
// analyze a sample set and optionally filter
|
|
// the tone frequencies.
|
|
bool analyze(double sample); // input signal sample
|
|
bool evaluate(); // evaluate result
|
|
|
|
// get the tone set
|
|
const double *getToneSet() const
|
|
{
|
|
return m_toneSet;
|
|
}
|
|
|
|
bool open() const {
|
|
return m_isOpen;
|
|
}
|
|
|
|
void reset(); // reset the analysis algorithm
|
|
|
|
protected:
|
|
void feedback(double sample);
|
|
void feedForward();
|
|
|
|
private:
|
|
unsigned int m_nbAvg; //!< number of power samples taken for moving average
|
|
unsigned int m_N;
|
|
unsigned int m_sampleRate;
|
|
unsigned int m_samplesProcessed;
|
|
unsigned int m_samplesAvgProcessed;
|
|
unsigned int m_maxPowerIndex;
|
|
unsigned int m_nTones;
|
|
unsigned int m_samplesAttack;
|
|
unsigned int m_attackCount;
|
|
unsigned int m_samplesDecay;
|
|
unsigned int m_decayCount;
|
|
unsigned int m_squelchCount;
|
|
bool m_isOpen;
|
|
double m_threshold;
|
|
double *m_k;
|
|
double *m_coef;
|
|
double *m_toneSet;
|
|
double *m_u0;
|
|
double *m_u1;
|
|
double *m_power;
|
|
std::vector<MovingAverage<double> > m_movingAverages;
|
|
};
|
|
|
|
|
|
#endif /* INCLUDE_GPL_DSP_CTCSSDETECTOR_H_ */
|