Preface

The rapid growth of microelectronics and digital computing has stimulated a significant growth in the area of digital signal processing (DSP). The concepts of DSP proliferated in many areas such as telecommunications, digital television, biomedical engineering, digital audio, and power conversion. DSP now seems to be a core for many new emerging digital applications and for the information society. Today's information revolution paves the way for the engineers in the areas of electronics, computer and communication engineering to think about DSP concepts.

Just a decade ago, digital signal processing was more of theory than practice. The only sys‐ tems capable of doing signal processing were massive mainframes and supercomputers and, even then, much of the processing was not done in real time but off-line in batches. For ex‐ ample, seismic data were collected in the field, stored on magnetic tapes and then taken to a computing centre, where a mainframe might take hours or days to digest the information. The first practical real-time DSP systems emerged in the late 1970s and used bipolar 'bitslice' components. The economics began to change in the early 1980s with the advent of sin‐ gle-chip metal-–xide semiconductor (MOS) DSPs.

Digital signal processors were invented to handle digital signal processing tasks and were available in a variety of applications like audio signal processing, audio and video compres‐ sion, speech processing and recognition, digital image processing, digital communications, biomedicine, seismology and radar applications. Specific uses include speech transmission in mobile phones, seismic data processing, analysis of industrial processes, medical imaging such as computerized axial tomography (CAT) scans, MP3 compression and computer graphics.

#### **Scope of the Book**

Many books are available for understanding digital signal processing concepts. This book is an outcome of research done by various researchers and professors who have highly contributed to the field. This book would suit researchers in the field of digital signal processing.

#### **Structure of the Book**

The book contains six chapters divided into three sections. The reader is expected to know the fundamentals of digital signal processing, which are available in all the standard DSP books.

Section 1, consisting of three chapters, deals with applications of digital signal processing in communication engineering. Section 2 contains two chapters and describes the application of digital signal processing concepts in image processing. Section 3, consisting of a single chapter, focuses on the role of DSP in power conversion systems.

#### **Acknowledgements**

I thank the Almighty for showering His blessings and giving me the intelligence and energy to complete this work. My sincere thanks to the management of Dr. Mahalingam College of Engineering and Technology and Prof. C. Ramaswamy, Secretary, NIA Institutions, for their encouragement and patronage rendered to carry out this work. I am indebted to my wife Mrs. Vinitha Mohan. Her support, encouragement, quiet patience and unwavering love un‐ deniably led me to the successful completion of the work. I am at a loss for words to thank my son S.V. Hemesh for putting up with my preoccupation, for his understanding and for the love he gave me. I am grateful to InTech publisher, especially the Publishing Process Manager Ms. Iva Lipović who constantly helped me in bringing this book to completion.

#### **Dr. Sudhakar Radhakrishnan**

Department of Electronics and Communication Engineering, Dr. Mahalingam College of Engineering and Technology, India
