Before revision: Linear dynamical system For a linear time-invariant black box, let for notational convenience: the step response can be obtained by convolution of the Heaviside step function control and the impulse response h(t) of the system itself which for an LTI system is equivalent to just integrating the latter.
After revision: (LTI)Linear dynamical system For a linear time-invariant black box, let for notational convenience: the step response can be obtained by convolution of the Heaviside step function control and the impulse response h(t) of the system itself which for an LTI system is equivalent to just integrating the latter.