sdrangel/include/dsp/agc.h

129 wiersze
2.5 KiB
C++

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