Design of Recursive Digital Filters
Trevor J. Terrell · 1980
Recursive digital filters are commonly referred to as infinite impulse response (IIR) filters. The term recursive intrinsically means that the output of the digital filter, y ( n ) T , is computed using the present input, x ( n ) T , and previous inputs and outputs, namely, x ( n − 1) T , x ( n − 2) T ,…, y ( n − 1) T , y ( n − 2) T ,…, respectively.