fourier transform basic confused

Discussion in 'Homework Help' started by vead, Dec 29, 2011.

  1. vead

    Thread Starter Well-Known Member

    Nov 24, 2011
    hi everyone
    i am just begin to learn about Fourier transform
    i know Fourier transform is used to analysis of signals such as Rf signal
    which convert time domain to frequency domain

    for example
    how to know signal is periodic or aperiodic
    how to take Fourier transform of this function

    i am trying to learn how time domain is converted in to frequency domain
    please someone explain with simple trick

    thanks for every help
  2. Zazoo


    Jul 27, 2011
    A periodic signal repeats at regular intervals (an aperiodic signal does not.)

    For a transform there isn't really a "simple trick" as there is a lot of theory behind the transform itself and how the two domains relate to one another.

    There are, however, Fourier transform tables which list transforms for common functions.
  3. thatoneguy


    Feb 19, 2009
    Your equation, sin\omega_0t is halfway down the second page of the PDF linked above.

    So if there is an FFT for it (though too long for me to type in right now), do you think that means it is periodic or transient/aperiodic? Look at the FFT of your function and decide if there is a constant, or something that will settle to a steady state.