Most of the signals in the physical world are continuous-time signals Examples:voltage current,pressure, temperature,velocity,etc. x() 0 t
Most of the signals in the physical world are continuous-time signals • Examples: voltage & current, pressure, temperature, velocity, etc
Examples of Discrete-Time Signals in Nature -DNA base sequence Population of the nth generation of certain species [n] x[0] x[1][1 x[2] n
Examples of Discrete-Time Signals in Nature – DNA base sequence – Population of the nth generation of certain species
Humen-Made Discrete-Time Signals Ex.#1 Weekly Dow-Jones industrial average 400 350 300 68 8 50 Jan.5,1929 Jan.4,1930
Humen-Made Discrete-Time Signals
Humen-Made DT Signals Ex.#2 digital image
Humen-Made DT Signals
Why DT? DT signals can be processed by modern digital computers and digital signal processors (DSPs)
Why DT? • DT signals can be processed by modern digital computers and digital signal processors (DSPs)