MCA SEM 2 ANALOG AND DIGITAL
Data vs. Signal
Data– information formatted in human/machine readable form •examples: voice, music, image, file
Signal – electric or electromagnetic representation of data •transmission media work by conducting energy along a physical path; thus, to be transmitted, data must be turned into energy in the form of electro-magnetic signals
Transmission –communication of datathrough propagation and processing of signals
Analog vs. Digital
Analog vs. Digital Data
analog data
representation variable takes on continuous values in some interval, e.g. voice, temperature, etc.
digital data–
representation variable takes on discrete (a finite & countable numberof) values in a given interval, e.g. text, digitized images, etc.
Analog vs. Digital Signal
analog signal–
signal that is continuous in timeand can assume an infinitenumber of values in a given range (continuous in time and value)
Discrete (digital) signal–
signalthat is continuous in timeand assumes only a limitednumber of values (maintains a constant level and then changes to another constant level)