Understanding Signals and Systems is an introductory text that treats classical (analytical) and modern (computational) methods of signal analysis and the interaction of signals with systems. Taking a new approach to a well established but rather mathematical subject, it explains the concepts in a careful and simple manner without losing rigour. It gives readers an insight into the fundamental ideas in this important area of study and provides a firm base for progressing on to more advanced and specialised texts. Fourier Analysis and Synthesis are approached in a fresh and original manner.