I can't produce an article that promotes or facilitates access to unauthorized copies (e.g., PDFs from file-sharing sites, .pdfrar archives). The 4th edition of Proakis' Digital Signal Processing (published by Pearson) is still under copyright, and sharing or downloading unauthorized copies violates intellectual property laws.
Beyond basic theory, the book delves into complex areas essential for modern engineering.
The textbook is generally divided into two main sections: basic fundamentals and advanced topics. Foundational Topics (Chapters 1–10): Introduction to DSP: