This document discusses analog and digital signals used for data communication. Analog signals are continuous over time and value, while digital signals are discrete using binary numbers. Some key differences are that analog signals can be affected by noise during transmission while digital signals are noise-immune, analog devices typically draw more power than digital, and digital signals are better suited for computing and memory storage while analog is used for audio/video. Examples of analog signals include voices and speedometers, while digital examples include computers, cameras and watches.

1. DATA COMMUNICATIONS
Analog &
Digital Signals
By-SurinderK.Mourya
1

2. DATA COMMUNICATION
By-SurinderK.Mourya
2
Analog and digital signals are data communication
signals. These are used for transmiting information
(such as any audio or video), through electronic signals.
In digital technology, translation of information is into
binary format (either 0 or 1) and information is
translated into electric pulses of varying amplitude in
analog technology.

3. ANALOG SIGNAL
 An Analog signal is any continuous signal.
 The analog signals were used in many systems to
produce signals to carry information.
 These signals are continuous in both values and
time.
 The use of analog signals has been declined with
the arrival of digital signals.
 In short, to understand the analog signals – all
signals that are natural or comes naturally are
analog signals.
3
By-SurinderK.Mourya

4. ANALOG SIGNAL
4
By-SurinderK.Mourya
SIGNAL
TIME

5. ANALOG DEVICES
5
By-SurinderK.Mourya

6. DIGITAL SIGNAL
 A digital signal uses discrete (discontinuous)
signal.
 These are not continuous but signals are discrete in
value and time.
 These signals are represented by binary numbers
and consist of different voltage values.
 Although digital representations are discrete, the
information represented can be either discrete,
such as numbers or letters, or continuous, such as
sounds, images, and other measurements of
continuous systems.
6
By-SurinderK.Mourya

7. DIGITAL SIGNAL
7
By-SurinderK.Mourya
SIGNAL
TIME
0 101 10

8. DIGITAL DEVICES
8
By-SurinderK.Mourya

9. DIFFERENCE BETWEEN
By-SurinderK.Mourya
9
Analog Signal
Digital Signal
&

10. SIGNAL
By-SurinderK.Mourya
10
 Analog signal is a
continuous signal
which represents
physical
measurements.
 Digital signals are
discrete (or
discontinuos) time
signals generated by
digital modulation.
Analog Signal Digital Signal

11. WAVES
By-SurinderK.Mourya
11
 Denoted by sine waves  Denoted by square
waves
Analog Signal Digital Signal

12. RESPONSE TO NOISE
By-SurinderK.Mourya
12
 More likely to get
affected reducing
accuracy
 Less affected since
noise response are
analog in nature
Analog Signal Digital Signal

13. DATA TRANSMISSION
By-SurinderK.Mourya
13
 Affected by noise
during transmission
and write/read cycle.
 Noise-immune during
transmission and
write/read cycle.
Analog Signal Digital Signal

14. USES
By-SurinderK.Mourya
14
 Can be used in analog
devices only. Best
suited for audio and
video transmission.
 Best suited for
Computing and digital
electronics.
Analog Signal Digital Signal

15. MEMORY
By-SurinderK.Mourya
15
 Stored in the form of
wave signal
 Stored in the form of
binary bit
Analog Signal Digital Signal

16. POWER
By-SurinderK.Mourya
16
 Analog instrument
draws large power
 Digital instrument
draws only less power
Analog Signal Digital Signal

17. COST
By-SurinderK.Mourya
17
 Low cost and portable  Cost is high and not
easily portable
Analog Signal Digital Signal

18. By-SurinderK.Mourya
18

19. EXAMPLE
By-SurinderK.Mourya
19
 Human voice in air,
analog electronic
devices.
 Speedometers, energy
meters and traditional
washing machine, etc
 Computers, CDs,
DVDs, and other digital
electronic devices.
 Digital cameras and
watches,
thermometers,
scanners, modern
computers, etc.
Analog Signal Digital Signal

20. REFERENCE
 https://www.geeksforgeeks.org/difference-between-
digital-and-analog-system/
20
By-SurinderK.Mourya