Electronics and Communication Engineering - Signals and Systems - Discussion

46. 

Which one is a causal system?

[A]. y(n) = 3x[n] - 2x[n - 1]
[B]. y(n) = 3x[n] + 2x[n + 1]
[C]. y(n) = 3x[n + 1] + 2x[n - 1]
[D]. y(n) = 3x[n + 1] 2x[n - 1] + x[n]

Answer: Option A

Explanation:

For causal output must depend upon Present and past not on future.


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