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 rec...
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http://en.wikipedia.org/wiki/Recursive_filter
A filter in which there is no need to store past measurements for the purpose of calculating current estimates. Such a filter makes use of a recursive algorithm for its operation. See also: Filter, Kalman Filter.
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https://www.encyclo.co.uk/local/20687
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