This lesson presents several IIR filter examples designed using MATLAB. You will learn to design IIR filters using MATLAB's built-in filter-design functions from these examples. The lesson explains the conventions used by MATLAB to declare filter design specifications and how to properly call the relevant functions to perform the design. A comparison of different prototype filters is given to illustrate the filter design process and highlight differences between different prototypes. Mastering the skills used to design these IIR filter examples will enable you to design filters for your own application.