Digital Signal Processing by A Nagoor Kani has been written keeping in mind the requirement of the students. The subject dealt with in this book is highly mathematical in nature. The author of the book has, therefore, laid stress on the methodology of solving various problems. Mathematical derivations are elucidated in a step-by-step manner for students to understand and remember. In order to help improve the understanding of the subject, the author has provided exercise problems ranging across a wide variety of difficulty levels. The book contains 12 chapters which covers various topics and 7 Appendices which contain the key points on certain vital matters relating to the subject. The book contains a total of 320 solved examples and 1080 exercise problems. to make the subject more understandable for students, a set of 305 short questions and answers are also provided in the book.