Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not an introduction

The online description states "Ideal for introductory university modules", but the preface of the book (which is not included in the pages that are provided for online viewing) states "This book is not a basic signal processing textbook... it is assumed you have a good knowledge of sampling, difference equations, z-transforms, FIR and IIR filters, FFT, etc." I was looking for something more basic so I sent it back.