Problem with Hard Discrete Convolution

Discussion in 'Homework Help' started by J_Y, May 5, 2009.

  1. J_Y

    Thread Starter New Member

    May 5, 2009
    Hi guys
    I've been racking my brains over this question for over 3 days..

    The question has several parts, which I think I did correctly for the most part...
    I am given 2 equations

    From there I z-transformed the x[n] and calculated H[z] and h[n]

    It also asked for y[n], which I calculated to be

    Then the last part is where my problem lies
    It requires me to prove y[n] through convolution of x[n] and h[n], with the assumption that the system is causal

    Question 1: Can you even convolve a non causal input with a causal system?
    Question 2: This is my attempt I got the answer of [​IMG]

    Where am I going wrong??? :mad: