sdrangel/sdrbase/dsp/agc.h

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2.4 KiB
C
Czysty Zwykły widok Historia

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/*
* kissagc.h
*
* Created on: May 12, 2015
* Author: f4exb
*/
#ifndef INCLUDE_GPL_DSP_AGC_H_
#define INCLUDE_GPL_DSP_AGC_H_
#include "movingaverage.h"
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class AGC
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{
public:
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AGC(int historySize, Real R);
virtual ~AGC();
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void resize(int historySize, Real R);
Real getValue();
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Real getAverage();
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virtual void feed(Complex& ci) = 0;
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protected:
Real m_u0;
Real m_R; // objective mag
MovingAverage<double> m_moving_average; // Averaging engine. The stack length conditions the smoothness of AGC.
int m_historySize;
int m_count;
};
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class MagSquaredAGC : public AGC
{
public:
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MagSquaredAGC(int historySize, Real R);
virtual ~MagSquaredAGC();
virtual void feed(Complex& ci);
Real getMagSq() const { return m_magsq; }
private:
Real m_magsq;
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};
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class MagAGC : public AGC
{
public:
MagAGC(int historySize, Real R);
virtual ~MagAGC();
virtual void feed(Complex& ci);
Real getMagSq() const { return m_magsq; }
private:
Real m_magsq;
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};
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class AlphaAGC : public AGC
{
public:
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; }
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private:
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Real m_alpha;
Real m_magsq;
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bool m_squelchOpen;
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};
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class SimpleAGC
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{
public:
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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)
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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;
m_cutoff = cutoff;
m_clip = clip;
m_moving_average.resize(historySize, initial);
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}
void fill(double value)
{
m_moving_average.fill(value);
}
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Real getValue()
{
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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);
}
}
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private:
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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<double> m_moving_average; // Averaging engine. The stack length conditions the smoothness of AGC.
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};
#endif /* INCLUDE_GPL_DSP_AGC_H_ */