This book deals with the fundamentals of Signal Processing and is a precursor to the study of DSP. The several chapters introduce the important principles of Fourier Transform (FT), Laplace Transform, Z-transform, Convolution, Correlation etc. of signals. There are clear illustrations and proofs for the theory described at every stage. A large number of examples are included with clear solutions. Exercises for practice with answers are given at every chapter end. This book will serve the needs of students studying Electrical and Electronics Engineering (EEE), Electronics and Instrumentation Electronics Communication Engineering (ECE) as well as Advanced Applied Physics.