Rating: 
Summary: Not a beginners book
Review: Although the authors say this book could be used as an introductory text in DSP, it is not. This book is a no nonsense approach towards DSP. You need firm grounding in calculus, signals and systems to be close to even understand what the authors intend to say. With a good professor and with the skill set that the authors assume you have, you will find this a life long reference. How ever for the not so sure Stanley's Digital Signal processing is a much better choice. The beginner should find Richard Lyon's Understanding DSP to be more user friendly, but if you outgrow Lyon, then this is the book that would whet your appetite.This book will be one you will frequently refer to clear your doubts.
Rating:
Summary: Not a beginners book
Review: Although the authors say this book could be used as an introductory text in DSP, it is not. This book is a no nonsense approach towards DSP. You need firm grounding in calculus, signals and systems to be close to even understand what the authors intend to say. With a good professor and with the skill set that the authors assume you have, you will find this a life long reference. How ever for the not so sure Stanley's Digital Signal processing is a much better choice. The beginner should find Richard Lyon's Understanding DSP to be more user friendly, but if you outgrow Lyon, then this is the book that would whet your appetite.This book will be one you will frequently refer to clear your doubts.
Rating: 
Summary: The DSP Bible
Review: As others have said, this is the DSP bible. I have worked in the field of DSP as a post-grad student, lecturer ("professor") and an R&D engineer for over 10 years now and this book is in my "must-have" collection. It is the book I learnt my DSP from; it is the book I have taught DSP from; it is a very good reference book for the practicioner. Having said that, I should also point out what I believe this book is not (and why it gets only 4 stars) : it is not a good book for self-learning. If this is what you are after, I recommend Rick Lyons' book "Understanding Digital Signal Processing" (five stars from me). If you are a mechanical engineer learning DSP, I suggest asking your local Bruel & Kjaer representative if he'll give you a copy of Bob Randall's "Frequency Analysis" published by B&K (ISBN 87 87355 07 8; "only" 3.5 stars, but 4.5 stars if you're a mechanical engineer).
Rating:
Summary: The DSP Bible
Review: As others have said, this is the DSP bible. I have worked in the field of DSP as a post-grad student, lecturer ("professor") and an R&D engineer for over 10 years now and this book is in my "must-have" collection. It is the book I learnt my DSP from; it is the book I have taught DSP from; it is a very good reference book for the practicioner. Having said that, I should also point out what I believe this book is not (and why it gets only 4 stars) : it is not a good book for self-learning. If this is what you are after, I recommend Rick Lyons' book "Understanding Digital Signal Processing" (five stars from me). If you are a mechanical engineer learning DSP, I suggest asking your local Bruel & Kjaer representative if he'll give you a copy of Bob Randall's "Frequency Analysis" published by B&K (ISBN 87 87355 07 8; "only" 3.5 stars, but 4.5 stars if you're a mechanical engineer).
Rating:
Summary: If you can only get one DSP book, get this one!
Review: I am a DSP software engineer and use this book relatively frequently as a reference. This was the textbook for a DSP class I took at Arizona State University. I also see this book referenced frequently in DSP literature everywhere. The book covers fundamental theory of DSP very well, and also gets into some areas of DSP applications. I highly recommend it.
Rating:
Summary: Absolutely the bset book in DSP
Review: I am a ee undergraduate,and I took the course DSP after I took courses like complex variables differential equations,and signal &systems(another wonderful book by Oppenheim).This DSP book covers many fundamental concepts along with applications. And the exercises at the end of each chapter definitely help readers to fully understand the theories and applications.
Rating: 
Summary: Not Good for Self Study
Review: I am currently taking a first course in DSP where O&S is the text used. The text is just plain HELL to read. Explanations are often incomplete. I don't believe my professor had a choice in the selection because the other day he called in incoherent. I recently spoke to a second professor at UT who said he never uses it in his courses because he believes the authors are trying to impress their colleagues with the writing style. Specific topics covered so far in the course, which are mentioned, but NOT covered in the text: Closed form solution of Difference Equations, complex convolution theorem, unilateral Z-transform and their use in the solution of Difference Equations with non-zero initial conditions, and Contour Integration. I can see where some people use this as a reference, because there are many brief, accurate statements. But if you're trying to learn this material for the first time, look elsewhere.
Rating:
Summary: DTSP vs. DSP by Oppenheim and Schafer
Review: I am referring here to the Digital Signal Processing (DSP) that the authors wrote in the 1970's or earlier versus the more recent editions of Discrete-Time Signal Processing (DTSP). I have both the DSP version and the 1st edition of DTSP, and used them for coursework. From my personal recollection: I tried to take an introductory graduate-level DSP course twice, once with the old DSP text (but did not get to finish), and the second time completing the course from another college with the DTSP text. DSP, in spite of its introductory and pioneering nature, turned out to be the more readable and better organized textbook among the two. It is shorter by many pages, less verbose, less "heavy and circular in arguments", and quicker to come to the point, not to mention being clearer, more lucid, and well-illustrated with good examples and diagrams without overwhelming the reader. The beginning chapters are well written with introduction to the applications of Complex Variables in the context of DSP as an EE subject. In short, DSP by Oppenheim and Schafer is the less ambitious book of the two, but really accomplishes much more by doing less and focusing on the essential concepts underlying DSP. I can see why and where many beginning EE Signal Processing students tend to get frustrated. DTSP, 1st edition, is actually a rewritten version of DSP, albeit meant to be a major extension (or expansion, if you wish) with more applications appended and "heavier expositions". (This reminds me of many other books by MIT EE faculty on the market.) I find the most frustrating part of DTSP is the chapters on transcending from the Discrete Fourier Transform (DFT) to Fast Fourier Transform (FFT). Why? All you have to do is look at the way the authors present the DFT, then get to understand the truncated DFT, and try to follow the steps that supposedly get one toward FFT's - not at all clear or well-connected conceptually. It is even more obvious when one tries to do the moderately difficult and somewhat tedious exercises at the back of each chapter. While it is true that DTSP appears superficially "precise and rigorous", I find it a bit convoluted and too ambitious in its treatment of digital signal processing topics, indicative of a desire to reflect trappings of the latest applications by demonstrating the power of the theory presented. Why not just return to the fundamentals of DSP and limit the topics to a manageable level, thereby retaining a high degree of visibility for the more average EE student. (Maybe DTSP was meant to be taught by the authors themselves, or by their Ph.D. students. That way, the obscure points, discussions and topics in the textbook could be explained away in live classroom lectures via student interactions. Right?) In spite of all this, I think DTSP has intrinsic value in EE Signal Processing, being that it retained much of the key concepts in the older DSP text with some original flavor. Suggestion to authors: Write another book on DSP, but limit the book to concepts and some elementary applications, just like the 1970's original, or better still edit and update the original to be published as an inexpensive classic by, say, Dover. Rewrite DTSP as the follow-on textbook. How about it? I really miss the lucid style of the more original DSP textbook by the authors. And I mean it, seriously!
Rating:
Summary: Reference or introduction?
Review: I found this book to be an excellent fundamental text about DSP. But is it a good introductory book for beginners? Well, it depends... The book covers the essential topics in great depth and that means every one of its 800+ pages is packed with concepts and details and examples. The style is clear, but the amount of information can be a little overwhelming when you read it for the first time. If you have time, patience, a good maths background, the desire to master the subject, and someone to clarify your doubts, this can be the best first book on DSP you could ever buy. If you just want to learn the basics, and don't have much time or patience you should probably look elsewhere.
Rating:
Summary: review of the 1st edition
Review: I have read the 1st edition of this book, and one must say that it is slightly obscure. Some paragraphs are rather convoluted, written in the ancient, academic Germanic manner. Other than a certain obtuseness in writing style, the content is quite all right. The examples are illuminating. The 2nd edition of the book is apparently more "watered-down", destroying subjects such as lattice structures and cepstral analysis.
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