exciter.h

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#ifndef __exciter_h__
#define __exciter_h__

#include "synthbase.h"
#include "synthfunctions.h"
#include "vafilters.h"

// -----------------------------
//  --- SynthLab SDK File --- // 
//  ----------------------------
// -----------------------------------------------------------------------------
namespace SynthLab
{
    class ExciterEG
    {
    public:
        ExciterEG() {}              
        virtual ~ExciterEG() {}     

    public:
        bool reset(double _sampleRate);
        double render();

        bool startEG();

        void setParameters(double _attackTime_mSec, double _holdTime_mSec, double _releaseTime_mSec);

    protected:
        double attackTime_mSec = -1.0;  
        double releaseTime_mSec = -1.0; 
        double holdTime_mSec = -1.0;    

        // --- calculate time params
        void calcAttackCoeff(double attackTime, double attackTimeScalar = 1.0);
        void calcReleaseCoeff(double releaseTime, double releaseTimeScalar = 1.0);

        //--- Coefficient, offset and TCO values
        //    for each state
        double attackCoeff = 0.0;       
        double attackOffset = 0.0;      
        double attackTCO = 0.0;         

        double releaseCoeff = 0.0;      
        double releaseOffset = 0.0;     
        double releaseTCO = 0.0;        

        double sampleRate = 0.0;        
        // --- the current output of the EG
        double envelopeOutput = 0.0;    

        // --- stage variable
        EGState state = EGState::kOff;      

        // --- timer for hold portion
        Timer holdTimer;                
    
        // --- RUN/STOP flag
        bool noteOn = false;            
    };

    class Exciter
    {
    public:
        Exciter() {}            
        virtual ~Exciter() {}   

    public:
        bool reset(double _sampleRate);
        double render(double coupledInput = 0.0);
        void startExciter();
        void setParameters(double attackTime_mSec, double holdTime_mSec, double releaseTime_mSec);
    
    protected:
        NoiseGenerator noiseGen;    
        ExciterEG noiseEG;          
        DCRemovalFilter dcFilter;   
    };


} // namespace
#endif /* defined(__exciter_h__) */