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Signal transformation

  1. Feb 10, 2008 #1
    In question 1b of the midterm in the pdf attached below, I don't understand why the solution should be what it stated in the other pdf attached rather than what I did in the picture, which basically flips 1a along y-axis.
     

    Attached Files:

  2. jcsd
  3. Feb 10, 2008 #2
    Flipping about the axis does not apply to the shift.
    You have h(t), and you want to compute h(y(t)) where y(t) = -t-2.
    h(-y(t)) [tex]\neq[/tex] h(y(-t))
    The former is what you did, which is to compute y(t+2) and then flip, but that gives you y(-t+2), so then you need to shift by 4 to get y(-t-2).
     
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