Book Review: Information Transmission, Modulation and Noise 3rd Ed.

mation problem. The author makes considerable use of the concept of the nullor element in the analysis of RC active circuits and whilst this concept is used most effectively in this text, it may not appeal to some teachers. Professor Bruton has considerable experience of the design and construction of practical active filters and this is reflected in the text, but there is no concise discussion of some of the problems arising from the non-ideal nature of practical devices. However, two chapters are devoted to the very practical subjects of sensitivity and tolerancing analysis. In his preface the author suggests that these chapters be omitted from an undergraduate teaching program, but I would strongly recommend the inclusion of Chapter 6, unless the undergraduates are taught tolerance analysis elsewhere in their course. The coverage of the various approaches to active filter design is well-balanced, and many circuits are analysed in detail, although the author has been selective in his choice of circuits. This book could be a useful teaching text and it certainly deserves a place in any reading list on RC active circuits. M. R. LEE, School ofElectronic Engineering, Newcastle Upon Tyne Polytechnic