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Definition of "infinite impulse response (IIR) filter" |
any filter having an impulse response of infinite length, therefore having a frequency response with at least one pole. In direct contrast with finite impulse response (FIR) filters, IIR filters employ feedback, which leads to an impulse response of infinite extent; consequently a causal IIR filter will depend on all previous inputs. As a simple example, every auto-regressive process can be expressed as the output of an IIR filter driven by white noise. |
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