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Homework Help: FIR filters, impulse responses and unit step function

  1. Apr 17, 2013 #1
    Hey everyone, the question I am faced with is this:

    Which of the following expressions involving δ[n] is incorrect?
    where "m" is a non zero integer and u[n] is the unit step function.

    A. u[n-m] = δ[n] + u[n-m+1]

    B. x[n]δ[n-m] = x[n-m]

    C. δ[n] = u[n] - u[n-1]

    D. δ[n]δ[n-m] = 0

    I have been scratching my head for a while, but really not sure what to do. Any help as always would be greatly appreciated!
  2. jcsd
  3. Apr 22, 2013 #2

    rude man

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    Homework Helper
    Gold Member

    Hey Jd, take a shot at each of these, explain your rationale & then maybe we can be of help.
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