graphical sheet of time functions <-> transmission functions

Hello,

Does anyone know an overview of common impulse responses including folding? I imagine a representation of the time function, e.g. sawtooth, and the frequencies it contains (Fourier). Such a practical overview had been issued by a professor during my studies of transmission technology. I want use it for deeper dive into harmonical content of waveforms and vice versa in vcvrack.

Unfortunately it was lost by me. Ideas?