Signals can be broadly defined as functions that convey information regarding the attributes or behavior of some phenomenon, with respect to sound, images or biological measurements. Signal processing is a sub-field of electrical engineering, mathematics and information engineering that is concerned with the analysis, synthesis and modification of such signals. It can be of different types, such as analog signal processing, discrete-time signal processing, digital signal processing and continuous-time signal processing, among others. It has prominent applications in the fields of speech signal processing, video processing, audio signal processing, image processing, wireless communication, control systems, process control, array processing, etc. This book outlines the techniques and applications of signal processing in detail. It will also provide interesting topics for research which interested readers can take up. With state-of-the-art inputs by acclaimed experts of this field, this book targets students and professionals.