... have less performance and flexibilitythan other digital filters. Recursive filters are also called Infinite Impulse Response (IIR) filters, since their impulse responses are composed of decaying ... distinguishes themfrom digital filters carried out by convolution, called Finite Impulse Response (FIR) filters. Thischapter is an introduction to how recursive filters operate, and how simple ... Since this impulseresponse in infinitely long, recursive filters are often called infinite impulseresponse (IIR) filters. In effect, recursive filters convolve the input signal witha very long filter...