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Finding impulse response of a system

  1. Oct 12, 2009 #1
    Hi,

    I have a question regarding on how to determine the impulse response of an LTI system which has the following conditions:
    1).its input is x(n) = u(n) and output is y(n) = (1/2)nu(n) ,and
    2).x(-1) = -1/3; x(0) = 1; x(1) = 1/2, and x(n) = 0 for all other values of n

    My approach:
    I know that x(n) can be expressed in terms of the sum from k=-infinity to k=+infinity of x(k)delta(n-k), so:
    x(n) = x(-1)delta(n+1) + x(0)delta(n) + x(1)delta(n-1/2) ---> up to here am I right?

    then,

    I also know that the u(n) in y(n) = (1/2)nu(n) emphasized that h(n)= 0 for n<0

    But after that I don't even know how to start in computing the impulse response h(n). I'm so lost here.:confused: can anyone help me with this? thank you soooo much.:smile:
     
  2. jcsd
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