Change in frequency on differentiation
No, in a conventional sense of a &quot;periodic signal&quot; phrase, but, if you permit me to delve into a math subtlety, differentiation can turn an aperiodic waveform to a periodic one:
$$
\frac{\mathrm{d}}{\mathrm{d}t}(a\cdot t + b\cdot \cos(\omega\cdot t)) = a-b\cdot\omega\cdot\sin(\omega\cdot t)
$$
Notwithstanding a dubious usefulness of this excursion.