Signals, Systems, and Transforms Phillips, Charles L.; Parr, John and Riskin, Eve

This is the kind of textbook that makes engineering students either love or hate their degree — a comprehensive deep-dive into signal processing, Fourier transforms, Laplace transforms, and linear systems theory. Phillips, Parr, and Riskin walk you through continuous and discrete signals, convolution, frequency analysis, and system modeling with the kind of methodical precision that either clicks beautifully or sends you spiraling into office hours. It's dense, it's rigorous, and it's built for upper-level undergrads in electrical or computer engineering who need to actually understand how signals behave in systems. If you're teaching yourself DSP or need a reference that doesn't handwave the math, this holds up. Not light reading, but that's the point.