Continuous-time signals. (Q2498273)

The book begins with the fundamental mathematical tools and basics of signals, in the first chapter, and proceeds, in the second chapter with spectral representation of signals along with a detailed account of the Fourier and inverse Fourier transforms, mainly of periodic signals. Chapter three discusses signal modulation as a cornerstone of communication and information transmission. Thus the chapter presents a detailed account of amplitude, frequency, phase and angle modulation of signals, techniques of modulation and mentions some of their applications. The fourth chapter deliberates on: The classification of signals as energy and power signals, energy and power-spectral-density of signals and comparison of signals through energy and power auto- and cross-correlations. Chapter five deals with band limited signals and their properties. It stresses the advantage of the Hilbert transform in some detail and mentions some of its applications. Then the discussion proceeds with the issue of sampling of band limited signals for digital processing; and reconstruction of analog signals from their samples. Correspondingly, related and important topics like the sampling theorem, signal interpolation, aliasing etc. are given due attention. Finally there are four appendices which compile useful formulas of transforms and mathematical identities as well as a short list of bibliographic references. This is a nice book on signal processing in communication technology. Ideas are succinctly explained with simple examples and appealing mathematics. Almost all examples in the book are accompanied by illustrations. The material is well organized and the text is written readably. Chapter summaries are some of the compelling aspects of the book. Furthermore, end-of-chapter problems are well sorted and fit the themes that have been presented in their respective chapters. All the way, the book give glimpses of historical accounts by pointing to the originators and major contributors of signal processing and related areas. However, it is a pity that the book makes almost no citation to the references listed in the bibliography. The reader might have been helped a lot, had there been a list for used abbreviations at the beginning of the book. The text needs, in many places, a language editing. At any rate, any one serious of doing signal processing should look into this book. In particular the brevity of the mathematics, the abundance of explanatory examples, etc., makes it accessible to readers at the advanced undergraduate level in the relevant field of studies. Surely, it can serve as a co-text or a reference for a course in signal processing.