Consider the cascade connection of two LTI systems in Figure P2.30:
(a) Determine and sketch w[n] if x[n] = (−1)nu[n]. Also, determine the overall output y[n].
(b) Determine and sketch the overall impulse response of the cascade system; i.e., plot the output y[n] = h[n] when x[n] = δ[n].
(c) Now consider the input x[n] = 2δ[n] + 4δ[n − 4] − 2δ[n − 12]. Sketch w[n].
(d) For the input of part (c), write an expression for the output y[n] in terms of the overall impulse response h[n] as defined in part (b). Make a carefully labeled sketch of your answer.
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