An A/D converter is an example of a dictionary definition of a system as "a group of related parts working together, or an ordered set of ideas, methods, or waynt s Of working" [9]. From an implementation point-of-view, a system is an arrangeme physical components connected or related in such a manner as to form and/or act as an entire unit. From a signal processing perspective, a system can be viewed as any process that results in the transformation of signals, in which systems act on signals in prescribed ways [10, 11].