Answer / Anoop Kumar Srivastava

A simple example of a recursive system is a first-order IIR filter defined by the difference equation y(n) = a*y(n-1) + b*x(n). A non-recursive system example is a moving average filter where the output at time n is the average of the last N input samples: y(n) = ∑ [x(n-k)] for k from 0 to (N-1).

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