Constraints for real-time digital filters

If a dynamical process is filtered by a PC, it needs a RTDF (Real-time Digital Filter) because it emits high quality output responses with respect to an error functional (compare the identification signal with respect to real signal [1], [5] and [27], with time constraints dictated by the real process requiring a critical synchronization between both systems (dynamical process and PC process). In either case the question of the digital process with respect to the real process will never be evaluated, and in consequence the answers in time will give a poor description with respect to evolution of the process with time restrictions.