From: pchung705@gmail.com   
      
   In engineering practice, analog signal that is transformed with Fourier   
   Transform has to be periodic. If signal is not periodic, but limited to   
   certain time interval, signal can be repeated, so formally can be treated as   
   periodic one.   
      
   Read more:   
      
   http://www.cirvirlab.com/index.php/electric/183-fourier-transfor   
   -and-dft-discrete-fourier-transform.html   
      
   and also online calculate DFT coefficients of an arbitrary signal:   
      
   http://www.cirvirlab.com/simulation/DFT-Discrete-Fourier-Transfo   
   m-sin-cos-calculator-online.php   
      
   --- SoupGate-Win32 v1.05   
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