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FFT

Heinrich Schindler requested to merge fft into master
  • Add option in Sensor to use a fast Fourier transform for the convolution of induced current and transfer function instead of doing the convolution in the time domain.
  • For now use the FFT implementation from Numerical Recipes.
  • TODO
    • Optimize the FFT implementation and/or use FFTW (through ROOT TVirtualFFT).
    • Cache the Fourier transform of the transfer function (instead of recomputing it at every call).
    • Avoid boundary effects due to periodicity.

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