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.
Rating:
Summary: On the difference between 2nd Edition and 1st Edition
Review: I used the author's book "Digital Signal Processing" in my college study, and I also read and cite the 1st Edition of
"Discrete-Time Signal Processing" during my work experience. That's a very good reference. But I don't have the
2nd Edititon. However, after going through the Table Of Contents of the 2nd Edition of "Discrete-Time Signal Processing", I
think Oppenheim&Schafer did a resaonable tradeoff to reflect state of the art in DSP domain. They add: Discrete Cosine Transform (DCT) which is mostly used in image compression, Multirate Signal
Processing which is used widely in modern DSP, and Oversampling and Noise Shaping Sampling for A/D and D/A
conversion. In consequence, they remove: Lattice Structure, IIR Filters Design, Cepstrum Analysis (often used in speech
signal processing) and Homomorphic Signal Processing, which are a bit sophisticated. And I guess the reason to
remove IIR Filter Dsign is there exists many computer-aided tools on digital filter design, and made this very easy.
Rating:
Summary: On the difference between 2nd Edition and 1st Edition
Review: I used the author's book "Digital Signal Processing" in my college study, and I also read and cite the 1st Edition of
"Discrete-Time Signal Processing" during my work experience. That's a very good reference. But I don't have the
2nd Edititon. However, after going through the Table Of Contents of the 2nd Edition of "Discrete-Time Signal Processing", I
think Oppenheim&Schafer did a resaonable tradeoff to reflect state of the art in DSP domain. They add: Discrete Cosine Transform (DCT) which is mostly used in image compression, Multirate Signal
Processing which is used widely in modern DSP, and Oversampling and Noise Shaping Sampling for A/D and D/A
conversion. In consequence, they remove: Lattice Structure, IIR Filters Design, Cepstrum Analysis (often used in speech
signal processing) and Homomorphic Signal Processing, which are a bit sophisticated. And I guess the reason to
remove IIR Filter Dsign is there exists many computer-aided tools on digital filter design, and made this very easy.
Rating: 
Summary: Simply the best
Review: I'm almost an engineer and during my digital signal theory course I found this book exaustive, precise, never approximative. If you want to start learning about DSP theory, read this one even if you'll need some knowledge especially in the field of complex analysys; anyway when you get to the end you'll be able to make filter projects in the same way you drink a glass of water!! The content of the book is well exposed: the author start introducing LTI systems representation, then he explores the Z-transform domain; after that he goes on speaking about A/D and D/A conversion. As far as I'm concerned I found chap 6 (about structures for digital filter) and chap 7 (about filter techniques) extremely interesting and useful. Hey, guys, if you don't have understood yet, this is a MUST
Rating:
Summary: The best on discrete time
Review: I'm an undergraduate student and I used this book in order to design digital filters to operate on images. In my opinion it's the best text about one dimensional discrete time signal processing because it's good for basic learning.
Rating:
Summary: Definitely a classic!
Review: My Professor recommended this book when I took the DSP subject and it proved to be one of the best book I ever have. There is no rubbish and everything contained is detailed and relevant points about DSP. If you are starting to learn DSP, then go for this book but bewarned that some concepts presented might be too hard to be understood by beginners, unless you have a tutor to guide you. This book is very detailed in the intermediate chapters, but the beginning chapters are a bit difficult to understand. This book can still be improved by clarifying difficult concepts and providing more simple examples for beginners. This is definitely a MUST for every student/engineer determined to learn DSP.
Rating:
Summary: Very good reference
Review: This book has its share of shortcomings, but overall, it is probably the best and most complete reference on DSP. Unfortunately, it does skip a few important topics. For example, the second edition threw out the section on designing IIR bandpass and highpass filters from lowpass prototypes. This section used to be in the first edition and is VERY important, so I don't see how Oppenheim & Schafer could have justified throwing it out. They also conspicuously left out filter design based on the frequency sampling method. But in spite of these omissions, it's hard to recommend another book over this one. The one that comes closest is Mitra's. In the end, if you want to learn DSP and work in the field, you have to have this book, as well as the ones by Mitra, Proakis & Manolakis, Jackson, and, of course, Rabiner & Gold. If you get all those, you'll have the complete reference of CORE DSP texts.
Rating:
Summary: Very good reference
Review: This book has its share of shortcomings, but overall, it is probably the best and most complete reference on DSP. Unfortunately, it does skip a few important topics. For example, the second edition threw out the section on designing IIR bandpass and highpass filters from lowpass prototypes. This section used to be in the first edition and is VERY important, so I don't see how Oppenheim & Schafer could have justified throwing it out. They also conspicuously left out filter design based on the frequency sampling method. But in spite of these omissions, it's hard to recommend another book over this one. The one that comes closest is Mitra's. In the end, if you want to learn DSP and work in the field, you have to have this book, as well as the ones by Mitra, Proakis & Manolakis, Jackson, and, of course, Rabiner & Gold. If you get all those, you'll have the complete reference of CORE DSP texts.
Rating:
Summary: To be in the Electronics business
Review: This book holds a close view of my desires. In the future, many people will see the value of this book.
We are moving from a digital age to more combined digital and analog time.
This is because digital signals are very limited in their structure and analog signals are very necessary to give digital more expression and freedom.
-Calvin
Rating:
Summary: The best and most detailed in its field
Review: This book is a great improvement over the same authors' book " Digital Signal Processing". Not only they cover some new material but they greatly clarified presentation of the old. This book goes into pains to explain what's really happening rather than just scattering formulaes. It's a mostly theoretical presentation. It can be complimented by books which cover more of the applications.
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