Lab · research foundations
Nonlinear harmonic folding
Interactive experiment
A third harmonic crosses Nyquist
Where does the harmonic created by a cubic nonlinearity appear?
Rate is 64 Hz. Blue circles mark direct nonlinear samples; the solid line joins them. Dashed amber is the ideally low-pass-filtered continuous cubic result evaluated at the same sample times. This analytic comparison has no finite-filter approximation.