mirror of https://github.com/f4exb/sdrangel.git
80 lines
1.3 KiB
C++
80 lines
1.3 KiB
C++
/*
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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 SimpleAGC
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{
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public:
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SimpleAGC() :
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m_squelch(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_squelch(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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return m_moving_average.average();
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} else {
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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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m_squelch = true;
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}
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void close()
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{
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if (m_squelch)
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{
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m_moving_average.fill(m_fill);
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m_squelch = false;
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}
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}
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private:
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bool m_squelch; // 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 m_moving_average; // Averaging engine. The stack length conditions the smoothness of AGC.
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};
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#endif /* INCLUDE_GPL_DSP_AGC_H_ */
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