Comment on the causality of y[n] = x[-n]
A. Time invariant
B. Causal
C. Non causal
D. Time varying
Answer:A
Comment on the causality of y[n] = x[-n]
A. Time invariant B. Causal C. Non causal D. Time varying
Explanation: For positive time, the system may seem to be causal. However, for negative time, the output depends on time at a positive sign, thus being in the future, enforcing non causality.