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Fourier analysis

  1. Aug 31, 2007 #1
    Hi all.
    I am learning a numerical method that involves Fourier transform.
    As far as I know, I think Fourier transform is tool to find the frequency spectrum of a signal.
    And the usual form shall be
    "Integrate from negtive infinity to positive infinity, f(x)*exp(i*w*x)dx"

    However, when i search this in wikipedia, it is defined with (w-wo), where wo is the central frequency.

    http://en.wikipedia.org/wiki/Split-step_method

    I don't really know what this definition is doing and what changes it would bring.

    Why is it necessary to do so?

    Please help.
     
  2. jcsd
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