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Electronics and Communication Engineering - Signals and Systems - Discussion

Discussion Forum : Signals and Systems - Section 2 (Q.No. 3)
Signals and Systems
3.
The ROC of sequence x[n] = (0.8)n ∪[n] + (0.4)n ∪[n]
|z| > 0.8
|z| > 0.4
0.4 < |z| < 0.8
|z| < 0.8
Answer: Option
Explanation:

ROC ⇒ 1 - 0.8 z-1 < 0 1 - 0.4 z-1

⇒ 1 > 0.8 z-1 ⇒ z > 0.4

or z > 0.8

By combining both condition

ROC because z > 0.4

If you consider z > 0.8 then ROC between the limit 0 to 0.4 excluded.

Discussion:
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