Many human-made dt signals Ex#1 Weekly dow-Jones Ex. #2 digital image industrial average 350 300 200 50 0 Jan.5,1929 Jan.4,1930 Courtesy of Jason Oppenheim Used with permission Why dt?- Can be processed by modern digital computers and digital signal processors DSPs6 Many human-made DT Signals Ex.#1 Weekly Dow-Jones industrial average Why DT? — Can be processed by modern digital computers and digital signal processors (DSPs). Ex.#2 digital image Courtesy of Jason Oppenheim. Used with permission