This book is one module of a textbook/technology set known as The Modular Series on Linear Systems. The book is the equivalent of a chapter in a typical book, with numerous examples and problems to illustrate and aid in understanding the theory. The fully correlated website provides supplemental examples and/or computer versions of book examples that use an engineering application program. These modules all offer a general treatment that analyzes Digital Signal Processing, Signals and Systems, Communication Systems, and Control Theory. They all feature several aids in learning the material, such as: On-line examples and problems easily modified and expanded; Computer based problems which reference all books in the series; On-line access to annotated bibliographies, vivid graphs, seminal and historical papers, and other graphical and visual material; and 17 fully solved examples -- treated in an analytical manner in the book, then redone using MATLAB programs on the web.