Hello,i have come to know that signals and systems by dr. Ramesh Babu is an excellent book. I want to read it before buying. I'm preparing for Gate.

Signals and Systems50% developed
This book is about the study of engineering signals and systems, from a discipline-neutral approach. It is a fundamental starting point in the field of engineering, and serves as the basic material that other advanced books in the engineering subject area are based. This book looks at the concepts of systems, serving as an introduction to systems theory. Also, this book examines signals, and the way that signals interact with physical systems.

While this book strives to be discipline-neutral, it currently is focused strongly on electrical engineering concepts. It is hoped that this book will be expanded to include information from other disciplines as well.

Signals and Systems tutorial is designed to cover analysis, types, convolution, sampling and operations performed on signals. It also describes various types of systems.

Audience
This tutorial is designed for students and all enthusiastic learners, who are willing to learn signals and systems in simple and easy steps. This tutorial will give you deep understanding on Signals and Systems concepts. After completing this tutorial, you will be at intermediate level of expertise from where you can take yourself to higher level of expertise.

Prerequisites
Before proceeding with this tutorial, you must have a basic understanding of differential and integral calculus, limits and adequate knowledge of mathematics.