In a finite input response (FIR) system observations or events far enough in the past have no effect on the current behaviour of the system. Typically this is true of systems that use a fixed window ovef the data of, say, the last N items and base responses only on these. However, this may also be less obvious. Some statistical time series analysis techniques ar FIR such as a moving average as well as {[window-based}} neural networks.
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Also known as FIR