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Homework Help: Signal x(t)

  1. Aug 23, 2010 #1
    I have a question regarding time shifting, stretching etc. For example:

    if I have y(t) = x(3t) does that mean that x(t) = y(t/3)?

    if I have y(t)=(-1/2)x(-3t+2) does x(t) = -2y(t/3 -2) ???
     
    Last edited: Aug 23, 2010
  2. jcsd
  3. Aug 23, 2010 #2

    LCKurtz

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    Yes.

    No. Let u = -3t+2 so t = (-1/3)(u-2). This gives

    y((-1/3)(u-2))=(-1/2)x(u)

    -2y((-1/3)(u-2)) = x(u). Replace the u by t and it's a little different than what you wrote.
     
  4. Aug 23, 2010 #3
    brilliant! thanks
     
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