Excitation

vivyd.excitation.Excitation(x, dt)	A class for representing any signal that can be interpolated and used to affect models.
vivyd.excitation.ExcitationGroup(*excitations)	A class for representing a group of excitations.
vivyd.excitation.NoiseGenerator(n, dt, psd_tab)	A class for generating one or more noise signals with a specified two-sided power spectral density function.
vivyd.excitation.psd_func