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Homework Help: Discrete Fourier Transform

  1. Apr 16, 2009 #1
    1. The problem statement, all variables and given/known data
    Find the discrete Fourier transform X[k] = DFTn {x[n]} of the following
    periodic sequences x[n] = x[n - N] with period N:

    (a) For n = 0 . . .N - 1 we have x[n] =[tex]\delta[/tex][n].
    (b) For n = 0 . . .N - 1 we have x[n] = [tex]\mu[/tex][n] -[tex]\mu[/tex][n - K] with K < N.
    (c) x[n] = cos( (2*pi*M*n)/N ).

    2. Relevant equations
    We dont have a book for my digital processing class and i missed couple of classes so i have no idea how to start these problems. A little hint or a link to a good tutorial/source would be greatly appreciated.

    3. The attempt at a solution
    Last edited: Apr 16, 2009
  2. jcsd
  3. Apr 19, 2009 #2


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