2.18. For each of the following impulse responses of LTI systems, indicate whether or not the system is causal: (a) h[n] = (1/2)"u[n] (b) h[n] = (1/2)"u[n – 1] (c) h[n] = (1/2)ni (d) h[n] = u[n+2] – u[n – 2] (e) h[n] = (1/3)"u[n] + 3"u[¬n – 1]

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2.18. For each of the following impulse responses of LTI systems, indicate whether or not the
system is causal:
(a) h[n] = (1/2)"u[n]
(b) h[n] = (1/2)"u[n – 1]
(c) h[n] = (1/2)ni
(d) h[n] = u[n+2] – u[n – 2]
(e) h[n] = (1/3)"u[n] + 3"u[¬n – 1]
Transcribed Image Text:2.18. For each of the following impulse responses of LTI systems, indicate whether or not the system is causal: (a) h[n] = (1/2)"u[n] (b) h[n] = (1/2)"u[n – 1] (c) h[n] = (1/2)ni (d) h[n] = u[n+2] – u[n – 2] (e) h[n] = (1/3)"u[n] + 3"u[¬n – 1]
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