I’ve started reading Hacker News, and this PDF on Fourier Transforms came across the feed. It’s a really interesting introduction to Fourier Transforms with some added information on how to create a signal processing device on the side.
Back in the day, I had once taken a speech perception class where we analyzed speech frequencies. For all I know I learned about Fourier Transforms then, but I don’t remember now. Either way, reading about sine waves have never made me so excited!