This Interactive Guide Makes the Discrete Fourier Transform Visual and Fun
Seeing Circles, Sines, and Signals
This eccentric, pop-science introduction to digital signal processing uses interactive visualizations, animations, and sound to explain the Discrete Fourier Transform. It prioritizes visual learning over linguistic, favoring simplicity and engagement over rigor. The author recommends it as a supplement, not a sole resource, and points to more formal texts like Lyons' Understanding Digital Signal Processing and the Coursera course by Prandoni and Vetterli.
One reason math texts are so abstruse and technical is because of all the specifications and conditions that have to be put on theorems to keep them out of crevasses. In this sense, they’re like legal documents, and often about as much fun to read.