In signal processing, a **recursive filter** is a type of filter which re-uses one or more of its outputs as an input. This feedback typically results in an unending impulse response (commonly referred to as *infinite impulse response* (IIR)), characterised by either exponentially growing, decaying, or sinusoidal signal output components.

However, a recursive filter does not always have an infinite impulse response. Some implementations of moving average filter are recursive filters but with a finite impulse response.

Read more about Recursive Filter: Examples of Recursive Filters

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