2015-05-12 06:12:13 -04:00
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/*
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* kissagc.h
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*
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* Created on: May 12, 2015
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* Author: f4exb
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*/
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#ifndef INCLUDE_GPL_DSP_AGC_H_
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#define INCLUDE_GPL_DSP_AGC_H_
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#include "movingaverage.h"
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class AGC
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{
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public:
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AGC();
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AGC(int historySize, Real R);
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virtual ~AGC();
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void resize(int historySize, Real R);
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Real getValue();
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Real getDelayedValue();
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virtual void feed(Complex& ci) = 0;
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virtual Real returnedDelayedValue() const = 0;
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void openedSquelch();
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void closedSquelch();
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protected:
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Real m_u0;
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Real m_R; // objective mag
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MovingAverage<Real> m_moving_average; // Averaging engine. The stack length conditions the smoothness of AGC.
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int m_historySize;
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int m_count;
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static const int m_mult = 4; // squelch delay multiplicator
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};
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class MagSquaredAGC : public AGC
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{
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public:
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MagSquaredAGC();
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MagSquaredAGC(int historySize, Real R);
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virtual ~MagSquaredAGC();
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virtual void feed(Complex& ci);
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virtual Real returnedDelayedValue() const { return m_u0; }
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};
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class MagAGC : public AGC
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{
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public:
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MagAGC();
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MagAGC(int historySize, Real R);
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virtual ~MagAGC();
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virtual void feed(Complex& ci);
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virtual Real returnedDelayedValue() const { return m_u0; }
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};
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class AlphaAGC : public AGC
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{
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public:
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AlphaAGC();
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AlphaAGC(int historySize, Real R);
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AlphaAGC(int historySize, Real R, Real alpha);
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virtual ~AlphaAGC();
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void resize(int historySize, Real R, Real alpha);
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virtual void feed(Complex& ci);
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virtual Real returnedDelayedValue() const { return 1; }
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void openedSquelch();
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void closedSquelch();
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private:
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Real m_alpha;
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bool m_squelchOpen;
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};
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class SimpleAGC
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{
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public:
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SimpleAGC() :
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m_squelchOpen(false),
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m_fill(0),
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m_cutoff(0),
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m_clip(0),
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m_moving_average()
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{}
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SimpleAGC(int historySize, Real initial, Real cutoff=0, Real clip=0) :
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m_squelchOpen(false),
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m_fill(initial),
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m_cutoff(cutoff),
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m_clip(clip),
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m_moving_average(historySize, initial)
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{}
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void resize(int historySize, Real initial, Real cutoff=0, Real clip=0)
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{
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m_fill = initial;
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m_cutoff = cutoff;
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m_clip = clip;
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m_moving_average.resize(historySize, initial);
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}
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Real getValue()
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{
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if (m_moving_average.average() > m_clip)
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{
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return m_moving_average.average();
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} else
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{
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return m_clip;
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}
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}
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void feed(Real value)
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{
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if (value > m_cutoff)
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{
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m_moving_average.feed(value);
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}
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}
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void openedSquelch()
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{
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m_squelchOpen = true;
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}
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void closedSquelch()
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{
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if (m_squelchOpen)
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{
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//m_moving_average.fill(m_fill); // Valgrind optim
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m_squelchOpen = false;
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}
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}
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private:
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bool m_squelchOpen; // open for processing
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Real m_fill; // refill average at this level
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Real m_cutoff; // consider samples only above this level
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Real m_clip; // never go below this level
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MovingAverage<Real> m_moving_average; // Averaging engine. The stack length conditions the smoothness of AGC.
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2015-05-12 06:12:13 -04:00
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};
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#endif /* INCLUDE_GPL_DSP_AGC_H_ */
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