Small- Signal Audio Design

Chapter 5

Filters

Analog filter design is an enormous subject, and it is of course quite impossible to cover even its audio aspects in a single chapter. There are many excellent and comprehensive textbooks on filters [1–3] and there would be no point in trying to create another one here. This chapter instead aims to give information on audio applications not found in the standard textbooks.

Filter design is at the root highly mathematical, and it is no accident that all of the common filter characteristics such as Bessel, Butterworth, and Chebyshev are named after mathematicians. Here, however, I am going to avoid the complexities of pole and zero placement etc., and concentrate on practical filter designs that can be adapted for use at different ...