Check if your university library offers a digital lending service. Platforms like Pearson or McGraw-Hill (depending on the publisher) often sell official eBooks with watermarks, which offer the same convenience as a PDF without the legal risk. Furthermore, official university repositories often provide "dispense" (lecture notes) authored by Luise and Vitetta specifically for their courses, which are legally free.
This is the critical part of the long article. The search often leads to shadow libraries (LibGen, Z-Library, or various Telegram channels). Luise Vitetta Teoria Dei Segnali.pdf
Here is the blog post:
Since I don’t have direct access to the specific PDF file you mentioned, I will write a that summarizes the core contents, typical audience, and key topics of that book. This post will be useful for engineering students (especially in Italian universities) approaching signal theory. Check if your university library offers a digital