The design and implementation of infinite impulse response filters
Patrick A. Gaydecki · Institution of Engineering and Technology eBooks · 2004
In this chapter, we have by no means explored all the ways in which it is possible to design IIR filters. Neither, it should be stressed, have we discussed all the major analog families that are represented in digital form (such as the elliptic filter). We have, however, scrutinised some of the more widely adopted approaches, and, most importantly, considered the basic principles of IIR construction. Up to this point, we have gained a working knowledge of three very important classes of digital filter: Fourier, FIR and IIR types. Although the manner of their realisations differs, they all share a pivotal characteristic of linearity, in that their properties do not change over time. In the next chapter, we will look at the adaptive filter, which, as its name suggests, adapts its response according to the form of its input signals.