Encapsulation of a generic data processing algorithm. A control block is connected
to a set of inputs uk and to a set of outputs yk and is capable
of propagating the inputs
to the outputs by applying a transfer function to them. The transfer function is of the
generic kind: yk+1=f(xk,uk) where xk is an
state variable that is internally propagated according to an equation like:
Control Block design pattern.