Signals and deeper singal theory is still perceived as “Black Magic” by computer scientists and avoided or overshaded by confuse implementations. Jack Schaedler wanted to change this and introduced a pretty nice looking introduction to circle sines and signals, condensend in “a compact primer on digital signal processing“. For all those people out there who ever wanted to understand how a DFT or FFT works and only heard little about the topic, this might be a good introduction to it. It is nicely designed and covers all basic topics from discrete signals, to mathematical representations up until Nyquist-theorem or Aliasing. With embedded moving examples the theory is presented in a nice graphical way for an easy understanding.