Intelligence systems. We perfonn routine tasks on a daily basis, as for example: тАв recognition of faces of persons (also faces not seen for many years), тАв identification of dangerous situations during car driving, тАв deciding to buy or sell stock, тАв reading hand-written symbols, тАв discriminating between vines made from Sauvignon Blanc, Syrah or Merlot grapes, and others. Human experts carry out the following: тАв diagnosing diseases, тАв localizing faults in electronic circuits, тАв optimal moves in chess games. It is possible to design artificial systems to replace or "duplicate" the human expert. There are many possible definitions of intelligence systems. One of them is that: an intelligence system is a system able to make decisions that would be regarded as intelligent ifthey were observed in humans. Intelligence systems adapt themselves using some example situations (inputs of a system) and their correct decisions (system's output). The system after this learning phase can make decisions automatically for future situations. This system can also perfonn tasks difficult or impossible to do for humans, as for example: compression of signals and digital channel equalization.