The theories and principles of digital filters and signal processing are explained in this extensive book. Digital filters along with signal processing, are being engaged in new technologies and information systems, and are implemented in diverse areas and applications. They are used with no costs and they can be adjusted for various cases fittingly with great flexibility and dependability. This book presents latest advancements in digital filters and signal process techniques covering different cases studies. They present the key fundamental nature of the subject, with the basic approaches to the most recent mathematical models that are being engaged worldwide.