Rating: 
Summary: A fantastic book
Review: A superbly crafted book with excellent examples and beautifully written text. Makes Oppenheim and Schafer's book seem like it was written in a foreign language
Rating: 
Summary: Horrible Book
Review: I am a 3rd year Engineering student and I find this book to be absolutely horrible. The text is confusing and the examples are horrible. They do not do any numerical examples worth reading. One of the worst textbooks I have ever had to use. If you are forced to use it, I am sorry. This book focuses more on theory then on numerical examples, which is what most students are tested on.
Rating: 
Summary: Solid Book
Review: I am a graduate student at USC and this book I actually used in lieu of the assigned book Digital Signal Processing (by Mitra). I referred to this book mainly because the assigned book hardly had any intuitive explanations and was quite convoluted. Proakis did a much better job in terms of the relationships between the various Fourier Transforms without comprising mathematical rigor. I also have Lyons Understanding Digital Signal Processing which is great for people new to DSP but I felt it lacked some depth in certain areas and did not have sample problems. Overall Proakis does a solid job with this book. I'd recommend it after knowing the material in Lyon's book.
Rating:
Summary: A very well written book
Review: I am currently taking an undergraduate intro to DSP class at Cal Poly Pomona. I have to say that I cannot put this book down!!. Mr Proakis does an excellent job presenting the material in a very readable format. I think this is a very good intro to Digital Signal Processing. The book has a nice flow and does a very good job in introducing the concepts. Another plus for the book are the examples provided. There are some very good problems at the end of each chapter. If you are getting this book I recommend the companion book "Digital Signal Processing with MATLAB" by Vinay K. Ingle and John G. Proakis. I highly recommend this book.
Rating: 
Summary: Inaccuracies and poor explanations reduce usefullness
Review: I have 6 years experience with digital signal processing, however, it has been so many years since i worked in this field that i purchased this book to update my skills. I found significant errors and very poor explanations in the section on sample rate conversion, the main section of interest to me. For example the sample input to the remez program will not work because you must specify the LGRID parameter even if only to set it to 0 - the example fails to set it. The 5 times interpolation example says that you should set the transition frequency to PI/5 and shows results based on that choice. This is in error, the choice should be Fs/5 (Fs=Sample freq) which produces a very different filter. And all of the Interpolating examples are incorrectly based on this model. In addition i can verify the filter result because it should approximate 0 at every 5th point and the center point of the filter should be 1/5. The book's interpolating filter does not show these properties. And lastly, but perhaps more importantly, the explanations are very ad-hoc providing very little insight into the underlying processes. For example the section on "polyphase" filters is nonsense with regard to signal processing, it is actually a simple programming performance enhancement based on recognizing the attributes of the data. The authors fail to make that clear and in fact obscures everything by describing it in signal processing terms. There are other examples i could provide but i'm only allowed 1,000 words. Sadly, I felt i had to give the book 2 stars because it appears to be the most up-to-date volume available.
Rating:
Summary: remain anonymous
Review: I took DSP in undergraduate and graduate program and hated the book because the professor was selling his own horrible note to the students, and the book was not followed properly - I was confused, therfore, I hated the book. After I graduated from school, I read the book and became my best teacher in DSP with rigourous mathematical proofs and derivation of equations. It is a must have book.
I even bought "DSP with Matlab" by Proakis later on.
Rating:
Summary: An excellent book about DSP theory!
Review: I've read many books about discrete time signal processing, but none like this! This is the best one so far. Everytime a theory had been explained, an example followed. You know what... I didn't understand DFT until I read this book! Other books explained theories like they were teaching professors, but this book is very excellent for undergraduate students.
Rating:
Summary: For all FPGA designers.
Review: If your are to design FPGA based DSPs, this book will be a must to have. If you are not familier with adaptive signal processing, and if you are feeling some difficulty on reading B.Widrow's "Adaptive signal processing", just like I was, it will be a good help to back to this basic book. In trad, students of electronics course were guided into complex analysis theories first, then from laplace-tran to z-trans, and after those trivial( I mean - too much detailed ) ceremonies, most texbook failed providing practical knowledge of real applications, so far as from my experience. This book refers to those residue-theory, contour integrals just in a minimal way. But still, this book told me a lot of clear ideas on implementations. Starting from differencial equations, explaining FIRs IIRs Lattice StateSpace and many basic ideas clearly ever before, I feel I was guided myself understanding many technical terms of MatLab which had been a kind of black-magic-words for me. Althogh in some part, like section 5.1, I had to be very carefull on his word explanation, such like "If we change the index in the inner summation from n to n-lN ... ", I was rewarded more than I payed for. I really enjoyed this book along with "Digital Signal Processing using MatLab" and with my PC. Although there are some printing error exists still on this Third-Edition, it will not be a big problem for most readers.
Rating:
Summary: The best DSP book
Review: Like the previous books of Prof. J. Proakis, this one is also clear and comprehensive; It covers all the fundamental aspects of DSP. I didn't try to solve the problems in the book, so I'm not the one who can provide the solutions to students.
Rating:
Summary: For me it has been like DSP for dummies !
Review: OK so it's not DSP for dummies, but it will fill in any aspects of mathematics that you might have forgotten while covering the theories. It certainly beats Oppenheim's Signal and Systems.
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