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"Digital Signal Processing" by John G. Proakis is a comprehensive textbook that provides a thorough introduction to the principles and techniques of digital signal processing (DSP). It covers fundamental concepts such as discrete-time signals and systems, Fourier analysis, z-transforms, digital filter design, and spectral analysis. The book also explores advanced topics including multirate signal processing, adaptive filtering, and digital signal processing applications. With clear explanations, numerous examples, and practical insights, Proakis's book serves as an invaluable resource for students, engineers, and researchers seeking a deep understanding of digital signal processing theory and its real-world applications.