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Homework Help: Discrete Time Fourier Transformation (DTFT) Question

  1. Oct 29, 2012 #1
    Hello all !

    1. The problem statement, all variables and given/known data

    I have the following problem.

    I have to calculate the DTFT of this : x(n)=u(n)-u(n-4).


    2. Relevant equations


    Fourier Transformations

    3. The attempt at a solution

    So far , from what I have studied I have understood, that a DTFT , is actually many DFT's calculated for different omega values, lets say in an interval from -pi to pi , with step 0.2 .


    Is this alright so far ?

    It is proven that x[n] = 1

    So finally have this:

    28s3aqq.png

    Now my main problem, how can I continue from that step ? Am I supposed to get some arithmetic result ?

    Thanks for you help !
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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