TRTElectronicsNoise.h

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/*
  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRT_DIGITIZATION_TRTELECTRONICSNOISE_H
#define TRT_DIGITIZATION_TRTELECTRONICSNOISE_H
 
#include "CLHEP/Random/RandomEngine.h"
 
#include <vector>
 
class TRTDigSettings;

class TRTElectronicsNoise {
 
public:
  TRTElectronicsNoise( const TRTDigSettings*,
                       CLHEP::HepRandomEngine *rndmEngine );
  ~TRTElectronicsNoise();

  void getSamplesOfMaxLTOverNoiseAmp(std::vector<float>& maxLTOverNoiseAmp,
                                     unsigned long nsamplings,
                                     CLHEP::HepRandomEngine *rndmEngine);

  void reinitElectronicsNoise(unsigned int numberOfDigitLengths
                              /*number of 75ns timeslices*/,
                              CLHEP::HepRandomEngine *rndmEngine);

  void setElectronicsNoiseAmplitude(double);

  void addElectronicsNoise(std::vector<double>& signal,
                           double noiseamplitude /*= 1.0*/,
                           CLHEP::HepRandomEngine *rndmEngine);
 
private:
 
  const TRTDigSettings* m_settings;

  void tabulateNoiseSignalShape();

  double getMax(unsigned int firstbinslowsignal,
                unsigned int firstbinfastsignal,
                unsigned int binsinwindow );
 
  std::vector<double> m_noiseSignalShape; 

  std::vector<float> m_cachedFastNoiseAfterSignalShaping;
  std::vector<float> m_cachedSlowNoiseAfterSignalShaping;
 
  std::vector<float> m_tmpArray;
 
  double m_fractionOfSlowNoise;
  unsigned int m_nbins_periodic;

  void InitializeNoiseShaping();
  double NoiseShape(double time) const;
 
  std::vector<double> m_noisepars1;
  std::vector<double> m_noisepars2;
 
};
 
#endif