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Computer Science
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Which one is a causal system?
y(n) = 3x[n] - 2x[n - 1]
y(n) = 3x[n] + 2x[n + 1]
y(n) = 3x[n + 1] + 2x[n - 1]
y(n) = 3x[n + 1] 2x[n - 1] + x[n]
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Correct Answer:
y(n) = 3x[n] - 2x[n - 1]
Explanation:
For causal output must depend upon Present and past not on future.
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