This book is a very important reference for students and practitioners involved in the field of signal and system technology. This book provides a very detailed explanation of digital signal processing, including its theory, techniques, and applications. In addition, this book is also equipped with case studies and application examples to help readers understand the concept better. One of the topics discussed in this book is the basics of digital signal processing. In short, this book consists of several discussions, including: What is Digital Signal Processing?, Discrete Time Signals, Signals and Hilbert Spaces, Fourier Analysis, Discrete Time Filters, Z Transform, Filter Design.