Signals- Cont

™   DIGITAL Signal o    A  digital  signal  is  discrete.  It  can  have  only  a  limited  number  of  defined values, often as simple as 1s and 0s o    The  transition  of  a  digital  signal  from  value  to  value  is  instantaneous  like  a light being switched ON and OFF Analog and Digital Signals o    We illustrate signals usually by plotting them on a pair of perpendicular axis o    Vertical axis represent the value or the strength of the signal o    Horizontal axes represent the passage of time o    The  curve  representing  the  Analog  signal  is  smooth  and  continuous,  passing through an infinite number o    The vertical lines of the digital signal shows the sudden jump the signal makes from value to value. The flat highs and the lows represent that those values are fixed o    In short, Analog signal varies continuously w.r.t Time whereas Digital signal varies instantaneous ™   Periodic Signals o    A signal is called Periodic if it completes a pattern within a measurable time frame  called  a  Period  and  then  repeats  that  pattern  over  identical  subsequent Periods o    The completion of one full pattern is called a CYCLE o    Period: Time required (in Seconds) to complete one full cycle, represented by 'T'