1. Digital signals are easy to store and retrieve
CDs store data in the form of digital signals I.e. in the form of 1s and 0s whereas magnetic tapes store it in analog form......all of us know that while using a CD we can retrieve and store data in a much easier way as compared to when we are given a magnetic tape (the old audio and video cassettes are magnetic tapes)
2. Noise immunity
Digital signals have finite number of amplitude levels (mostly 1s and 0s)thus if the signal is above our decision threshold it is declared to be 1 else it is declared as a 0
A Digital signal is as shown below it will help u understand better
Upper line shows the level for amplitude=1
Lowermost line shows the level for amplitude =0
The middle line shows the threshold level or the decision level
thus you can easily visualize that Digital signals do not change their levels with noise intervention,hence they are immune to noise
3. Privacy and security: Digital signals can be coded in various formats so that only the code compatible systems can Interpret the data,thus ensuring secrecy of the data.
4.Digital signals offer more reliable transmission.
Since,in case of an analog signal, addition of noise causes severe fluctuations in the amplitude ,the recieved signal may not be a true replica of the transmitted signal.This makes analog transmission unreliable.But digital transmission solves this problem by dividing the signal amplitude into levels.Hence,even if noise is added the possibility of the signal to attain another amplitude level is rare.This makes a digital transmission more reliable and noise immune.
5.Digital signals are cost effective
accuracy of a digital signal can be improved by increasing the number of levels within the amplitude range whereas its not so easy in analog signals.Hence,the cost and design efforts for a digital system is proportional to its accuracy but the cost and design effort for an analog signal increases exponentially with increasing accuracy.
CDs store data in the form of digital signals I.e. in the form of 1s and 0s whereas magnetic tapes store it in analog form......all of us know that while using a CD we can retrieve and store data in a much easier way as compared to when we are given a magnetic tape (the old audio and video cassettes are magnetic tapes)
2. Noise immunity
Digital signals have finite number of amplitude levels (mostly 1s and 0s)thus if the signal is above our decision threshold it is declared to be 1 else it is declared as a 0
A Digital signal is as shown below it will help u understand better
Upper line shows the level for amplitude=1
Lowermost line shows the level for amplitude =0
The middle line shows the threshold level or the decision level
thus you can easily visualize that Digital signals do not change their levels with noise intervention,hence they are immune to noise
3. Privacy and security: Digital signals can be coded in various formats so that only the code compatible systems can Interpret the data,thus ensuring secrecy of the data.
4.Digital signals offer more reliable transmission.
Since,in case of an analog signal, addition of noise causes severe fluctuations in the amplitude ,the recieved signal may not be a true replica of the transmitted signal.This makes analog transmission unreliable.But digital transmission solves this problem by dividing the signal amplitude into levels.Hence,even if noise is added the possibility of the signal to attain another amplitude level is rare.This makes a digital transmission more reliable and noise immune.
5.Digital signals are cost effective
accuracy of a digital signal can be improved by increasing the number of levels within the amplitude range whereas its not so easy in analog signals.Hence,the cost and design efforts for a digital system is proportional to its accuracy but the cost and design effort for an analog signal increases exponentially with increasing accuracy.
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