The Scientist and Engineer's Guide to
Digital Signal Processing
by
Steven W. Smith
http://www.dspguide.com/pdfbook.htm
https://doc.lagout.org/science/0_Computer%20Science/9_Others/1_Digital%20Signal%20Processing/The%20Scientist%20and%20Engineer%27s%20Guide%20to%20DSP.pdf
https://www.analog.com/en/education/education-library/scientist_engineers_guide.html