Infinite Impulse Response Filter Design
Taan S. ElAli · 2016
This chapter discusses the design of infinite impulse response (IIR) digital filters on the design of analogue continuous filters and sampling and transformations. The most important frequency transformation used to transform an analogue continuous filter to an IIR digital filter is the bilinear transformation. The chapter describes the bilinear and the impulse invariance transformations in the design process. Designing an irrational IIR digital filter is very difficult and its implementation is very costly. In designing stable and proper IIR digital filters, the chapter examines the wealth of knowledge and experience that is available in literature about designing analogue filters. The following MATLAB script will carry out the design and plot the input signal before and after passing through the digital IIR lowpass filter. Design a digital filter to approximate the input–output characteristics of the system Plot the input and the output of the filter by choosing appropriate input.