NEED OF DIGITAL SIGNALIMPORTANT POINTS

Important PointsAll real life signals are analog. Analog signal seems to be better then digital

but they are not.Digital signals are used in communication

Process.Digital signal are used minimize the effect of

noise.Noise is unwanted signal.It is very important to understand this

concept so that we may get further knowledge.

Lets take it as example.

ExampleWe need a transmitter to transmit signal and

a receiver to receive that signal.For their connectivity we need some source

or medium like channel(cable).

ExampleLets have values we have to transmit the

signal of 2.5 v and we have the range of transmitter up to 5v.

When we transmit this signal value will be changed due to effects.

Example We suppose that receiver receives a signal of

2.7 with effect of 0.2. This 0.2 is the noise which will removed in

digital system.Have a look in case of digital.

Example As we know that we have the certain levels in

digital system.We will have value according to levels only.In this case we have limit 0-5 so we have 4 levels

and if the noise comes then the effect is neglected.So we get the accurate signal.In real life we can have example of movies. In HD

print we have two type 720 and 1080. Both have different space because of their levels

more levels need more space.

Important This is applicable only for small signals.For long signal we have many advance

methodsSpecial devices are used to convert the

analog signal into digital signal.Digital signals are only in circuits.We cant see or feel them they exist as soft

data exist.Hope you learn it.See you next.Allah Hafiz