Since the 1990s, digital signals have been increasingly used not only in various industries and engineering equipments but also in everybody’s daily necessities. Mobile phones, TV receivers, music CDs, multimedia computing, etc, are the indispensable items in modern life, in which digital formats are taken as a basic form for carrying and storing information. The major reason for the advancement in the use of digital signals is the big leap forward in the popularization of microelectronics and computing technology in the past three decades. Traditional analogue broadcast is being widely upgraded to digital. A general shift from analogue to digital systems has taken place and.
