This is an undergraduate-level book in signal processing, but the title of this book is misleading since only one out of ten chapters is devoted to wavelets. Wavelets are described from the digital signal processing perspective, so I guess the preceding eight chapters (chapter 9 is wavelets; chapter 10 is applications) are intended to get people to the point to where they can understand the wavelet discussion. If you want a simple, undergraduate-level introduction to signal processing, then this book seems OK, but if you want a book on wavelets then you may wish to look elsewhere.