Before diving into processing, one must understand the nature of signals (continuous vs. discrete) and the systems that act upon them. Rao emphasizes the importance of linearity and time-invariance (LTI systems). 2. The Z-Transform
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If you're interested in learning more about digital signal processing, you can download the PDF version of Ganesh Rao's book for free. Here is a link to download the PDF: Before diving into processing, one must understand the