Q:

What is a convolution sum?

A) ∑x[k]h[n-k], k from -∞ to +∞ B) ∑x[k]*∑h[n-k], k from -∞ to +∞
C) ∑x[k]+∑h[n-k], k from -∞ to +∞ D) ∑∑x[k]h[n-k], k from -∞ to +∞
 

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