Dealing with both analogue and digital signals, the book covers the various ways in which signals can be studied to extract relevant information and examines methods of characterizing signals, as well as methods of investigating systems which generate or transmit signals. It includes practical examples to illustrate the application of the concepts and techniques and programs have been written in both FORTRAN 77 and BASIC, to facilitate use on both mini and microcomputers. The maths is at a relatively simple level, thus making the book accessible to a wide readership.