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Homework Help: Signals and Systems - Convolution

  1. Sep 24, 2007 #1
    1. The problem statement, all variables and given/known data
    http://img166.imageshack.us/img166/1162/untitledte2.jpg [Broken]

    2. Relevant equations

    y[n] = x[n] * h[n]

    3. The attempt at a solution

    I've never done convolutions going backwards..

    right off the bat, I know I'll noly have 2 terms in the convolution sum, because of x term, but I don't have a clue how to determine the h[n]. It is not possible to write a response y as a convolution between x and h because h is unknown.

    Any ideas?
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Sep 24, 2007 #2
    You know what signal x(n) is right? -- hint: what is the value of the digital delta function
    You know how long h(n) is right? -- hint: Length of Conv = Length of x + length h -1

    Put in place holders for the values of h and grind it out just like you were doing the convolution. It is the same idea as 2+x = 3 except that you have to add several values. Use two strips of paper if that helps. Don't forget to flip the final result.
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