Difference Between Analog And Digital Computer

 Difference Between Analog And Digital Computer

	Analog	Digital
signal	Analog signal is a continuous signal which represent physical measurements.	Digital signals are discrete time signals generated by digital modulation.
waves	Denoted by sine waves	Denoted by squares waves
Representation	Uses continuous range of values to represent information	Uses discrete or discontinuous values to represent information
Example	Human voice in air, analog electronic devices.	Computers, CDs, DVDs, and other digital electronic devices.
Technology	Analog technology records waveforms as they are.	Sample analog waveforms into a limited set of number and record them.
Data transformations	Subjected to deterioration by noise during transmission and write/read cycle.	Can be noise immune without deterioration during transmission and write/read cycle.
Response to noise	More likely to get affected reducing accuracy	Less affected since noise response are analog in nature
Flexibility	Analog hardware is not flexibility.	Digital hardware is flexible in implementation
Uses	Cab be used inn analog devices only. Best suited in audio and video transmission.	Best suited for computing and digital electronics.
Application	Thermometer	PCs, PDAs
Bandwidth	Analog signal processing cab be done in real time and consumes less bandwidth.	There is no guarantee that digital signal processing cab be done in real time and consumes more bandwidth to carry out the same information.
Memory	Stored in the form of wave signal	Stored in the form of binary bit
Power	Analog instrument draws large power	Digital instrument draws only negligible power
Cost	Low cost and portable	Cost is high and not easily portable
Impedance	low	High order of 100 megaohm
Errors	Analog instruments usually have a scale which is cramped at lower end  and give considerable observational errors.	Digital instruments are free form observational errors like parallax and approximation errors.