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<p><b>Infinite impulse response</b> (<b>IIR</b>) is a fundamental property applying to many <a href="page.php?w=linear_time-invariant_system">linear time-invariant system</a>s that are distinguished by having an <a href="page.php?w=impulse_response">impulse response</a>  that does not become exactly zero past a certain point but continues indefinitely. This is in contrast to a <a href="page.php?w=finite_impulse_response">finite impulse response</a> (FIR) system, in which the impulse response  does become exactly zero at times  for some finite ,</p><p>
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