NoiseWhite.cc

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#include <utl/MathConstants.h>
#include <utl/NoiseWhite.h>
#include <utl/RandomEngine.h>
#include <CLHEP/Random/RandFlat.h>

using namespace std;
using namespace utl;

using CLHEP::RandFlat;

NoiseWhite::NoiseWhite(double parTemperature, RandomEngine* parRandomEngine)
: Noise(parRandomEngine),
  fNoiseTemperature(parTemperature)
{
}

NoiseWhite::~NoiseWhite()
{
}

complex<double> NoiseWhite::GetSpectralFieldNoiseAtFrequency(double parFrequency, double parBandwidth) const
{
  double phase = RandFlat::shoot(&fRandomEngine->GetEngine(), 0, 2*kPi);  // random phase
  double amp = SpectralFieldAmplitudeOfNoiseTemperature(fNoiseTemperature, parFrequency, parBandwidth);
  return amp*exp(complex<double>(0,1)*phase);
}