Digital filters are used for two general purposes: separation of signals that have been combined, and restoration of signals that have been distorted in some way. Analog (electronic) filters can be used for these same tasks; however, digital filters can achieve far superior results. The most popular digital filters are described and compared in the next seven chapters. This introductory chapter describes the parameters you want to look for when learning about each of these filters.

The Scientist and Engineer’s Guide to Digital Signal Processing, ©1997-1998 by Steven W. Smith. For more information visit the book’s website at: