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Laplace and Systems Control and Analysis

  1. Feb 8, 2013 #1
    Using Laplace can someone please show me in simple terms how i would solve the following function? This is a lecture example. The solution just shows the answer, nothing about how we get it or what it represents. I am finding this subject particularly difficult to come to grips with.

    δ(t-1)

    Can you also explain what the function represents?

    Thanks

    mm
     
  2. jcsd
  3. Feb 11, 2013 #2

    NascentOxygen

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    Staff: Mentor

    δ(t-1) is an impulse at t=1, so it has no value at other values of time
    it represents a rectangular pulse of area = 1
    the width of the impulse is very narrow, approaching 0.00 nanoseconds
    which means its height is correspondingly high, tending to infinity.

    In practice, a realistic approximation to the delta function is plenty good enough for testing the impulse response of real-world systems.

    Sorry, I can't relate it to Laplace, I have forgotten the topic through disuse. :frown:

    Try searching google.
     
  4. Mar 1, 2013 #3
    The key point to know when computing the laplace of the dirac delta function is that the
    ∫[f(t)*δ(t-ε)]dt from {0 to t} = f(ε) because δ(t-ε) = 0 everywhere except ε and ∫(δ) from {0 to ∞} =1.
     
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