Infinite Impulse Response (IIR) filters are fundamental elements of Digital Signal Processing. This is dspGuru's mini-FAQ of "Frequently Asked Questions" on the subject of IIR filters.
1. IIR Basics
1.1 What are IIR filters? What does "IIR" mean?
IIR filters are one of two primary types of digital filters used in Digital Signal Processing (DSP) applications (the other type being FIR). "IIR" means "Infinite Impulse Response".