1. The document discusses various computer input and output devices. It describes input devices like keyboards, pointing devices, microphones, scanners, and webcams that allow users to enter data. It also covers output devices such as displays, printers, speakers, projectors, and touchscreens that convey information to users. 2. The functions of common input devices like keyboards, mice, touchpads, microphones, and scanners are explained. Output devices and their uses are also outlined, including displays, printers, speakers, projectors, and interactive whiteboards. 3. Examples are given for many device types, along with diagrams and pictures to illustrate key points. Input and output are defined, and various devices are

1. Computer System
2.5.4 Input and Output Device
At the end of this topic, students
should be able to:
a)Identify the input and output device
b)Explain the functions of input and output
devices
1
Chapter
PDT - 2017/2018

2. 3
● any hardware component allows users to enter data
and instructions into a computer
● Voice input : process of entering input by speaking into
a microphone
● Audio input : process of entering any sound into the
computer such as speech, music and sound effects
● Video input : process of capturing full-motion images
Define Input Device
2

3. •
1.
2.
Keyboard
Pointing device
•
•
•
•
•
Mouse
Trackball
Touchpad
Joystick
Stylus
3. Digitizer
•
•
Graphics Tablet
Scanner
4. Microphone
6
Examples of Input Device
3

4. 5.
6.
7.
8.
9.
Webcam
Touch screens
Joystick
Digital Camera
Reading devices
Character•
•
•
•
Optical
Optical
Recognition (OCR)
Mark Recognition (OMR)
Magnetic-Ink Character Recognition (MICR)
Biometric input device
7
Examples of Input Device
4

5. The Keyboard
•
A keyboard is an input device that contains keys
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Figure 5-2
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Discovering Computers : Chapter 5
users press to enter data and instructions into a
computer
5

6. Keyboard
Types:
1. Desktop computer keyboard
2. Keyboard for mobile devices 3. Keyboard ergonomics
9
6

7. Pointing Devices
A pointer is a small
symbol on the
screen
whose location and
shape change as a user
moves a pointing device
A pointing device is an
input device that allows
a user to control a
pointer on the screen
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Discovering Computers : Chapter 5
7

8. Mouse
• Mouse is a pointing device that fits under
the palm of your hand comfortably
11
8

9. Other Pointing Devices
• A trackball is a
stationary
pointing
device with a
ball on its top
or side
• A touchpad is
a small, flat,
rectangular
pointing
device that is
sensitive to
pressure and
motion
•A pointing
stick is a pressure-
sensitive pointing
device shaped like
a pencil
eraser that
is positioned
between keys on
a keyboard
12
Trackball
Touchpad
PointingStick
9

10. Touch Screens and Touch-Sensitive
Pads
•
A touch screen touch-sensitive display device
13
10

11. Microsoft Surface Touch-sensitivepads
14
Touch Screens and Touch-Sensitive
Pads
11

12. Pen Input
•
With pen input, you touch a stylus or digital pen on a flat
surface to write, draw or make selections
15
12

13. Other Input for Smart Phones
16
13

14. Game Controllers
•
Video games and computer games use a game controller
as the input device that directs movements and actions
Joysticks and
WheelsGamepads
Light guns Dance pads
Motion-
sensing controllers
17
14

15. Web Cam
•
A Webcam is a type of digital video camera that
enables a user to:
Send e-mail
messages with
video attachments
Capture video and
still image
Add live images to
instant messages
Broadcast live
images over the
Internet
Make video
telephone calls
18
15

16. Other Input Devices
–
Digital camera is a mobile device that allows
users to take pictures and store them digitally
– Microphone
• allows to speak into the computer
– Scanner
• converts printed material (text and
picture) into a form the computer can
used.
19
16

17. Scanners and Reading Devices
•
Optical character recognition (OCR) involves reading
characters from ordinary documents
•
A turnaround document is a document you return to the
company that creates and sends it
20
17

18. - Optical mark
recognition (OMR)
reads hand-drawn
marks such as small
circles or rectangles
- An OMR device scans
the documents and
matches the patterns of
light matches
21
Scanners and Reading Devices
18

19. Scanners and Reading Devices
•
A bar code reader, also
called a bar code scanner
uses laser beams to read
bar codes.
22
19

20. Scanners and Reading Devices
- RFID (radio frequency identification) uses radio signals to
communicate with a tag placed in or attached to an object
- An RFID reader reads information on the tag via radio waves
- RFID can track:
Tracking times of
runners in a
marathon
Tracking location
of soldiers
Employee
wardrobes
Checking lift
tickets of skiersAirline baggage
Gauging pressure
and temperature
of tires
Managing
inventory
Checking out
library books
Tracking toll
payments
23
20

21. Scanners and Reading Devices
•
Magnetic stripe card readers read the magnetic
stripe on the back of cards such as :
Credit cards
Entertainment cards
Bank cards
Other similar cards
24
21

22. Scanners and Reading Devices
- MICR (magnetic ink character recognition) devices read
text
printed with magnetized ink
- An MICR reader converts MICR characters into a form the
computer can process
25
- Banking industry uses MICR check processing
22

23. •
Data collection devices
obtain data directly at
the location where the
transaction or event takes place
Used in:
•
Restaurants, Grocery stores,
Factories,Warehouse
The outdoors
26
Scanners and Reading Devices
23

24. Biometric Input
•
Biometrics authenticates a person’s identity
byverifying a personal characteristic
Hand geometry
system
Voice
verification
system
Signature
verification
system
Iris recognition
system
Retinal
scanners
27
Fingerprint
reader Face Recognition
System
24

25. Biometric Input
28
fingerprint
reader
iris
recognition
system
hand
geometry
system
25

26. Terminals
•
A terminal is a computer that allows users to send data to
and/or receive information from a host computer
A POS terminal
records purchases,
processes
payment, and
updates inventory
An automated
teller machine
(ATM) allows users
to access their
bank accounts
A DVD kiosk is a
self-service DVD
rental machine
29
26

27. 3
Input Device
Type / example Function
Keyboard
- Desktop computer keyboard
- Keyboard for mobile device
- Keyboard ergonomics
Is an input device that contains keys users press to
enter data and instructions into a computer
● Ergonomic keyboard - Is an input device that
designed with ergonomic considerations to minimize
muscle strain and a host of related problems.
Pointing device
- Mouse
- Trackball
- Touchpad
- Joystick
- Pointing stick
Is an input device that allows a user to control a pointer
on the screen
● Mouse - a pointing device that fits under the palm
of your hand comfortably
● Trackball - a pointing device with ball on its top or
side
● Touchpad - a pointing device that is sensitive to
pressure and motion
● Pointing stick - a pointing device shaped like a
pencil eraser that is pressure sensitive
Input Device : Summary
27

28. 3
Input Device
Type / example Function
Digitizer
- Graphic tablet
- Scanner
● Graphic tablet - Is an input device that allows a user
to hand-draw images, animations and graphics, with
a special pen-like stylus, similar to the way a person
draws images with a pencil and paper.
Scanner - Is an input device that allow user to
converts printed material (text and picture) into a
form the computer can used
Microphone Is an input device that allow user to speak into the
computer
Webcam Is an input device that allow user to capture videos and
images,make video phone calls, broadcast live images
over the internet
Touch screen Is an input device that sensitive to pressure; a user
interacts with the computer by touching pictures or words
on the screen.
Digital camera Is an input device that allow user to take pictures and store
them digitally
Input Device : Summary
28

29. 3
Input Device : Summary
Type / example Function
Reading device
- Optical Character
Recognition (OCR)
- Optical Mark Recognition
(OMR)
- Barcode reader
- RFID
- Magnetic stripe card
reader
- MICR
- Biometric input device
● OCR - Is an input device that allow user to read characters from
ordinary documents
● OMR - Is an input device that allow user to scans the hand
drawn mark documents and matches the patterns of light
● Barcode reader - Is an input device that allow user to read
barcode by using laser beam
● RFID - (radio frequency identification) Is an input device that
allow user to reads information on the tag via radio waves. Eg :
tracking times of runners in a marathon, tracking location of
soldiers
● Magnetic stripe card reader - Is an input device that allow user
to read the magnetic stripe on the back of card such as credit
cards, bank cards
● MICR - (magnetic ink character recognition) Is an input device
that allow user to read text printed with magnetized ink. (clue :
bank check)
● Biometric input device - Is an input device that allow user to
authenticates person’s identity by verifying a personal
characteristic 29

30. 3
Input Device
Type / example Function
Terminals Is an input device that allow user to send data to/or
receive information from a host computer.
Eg : a post terminal, ATM (automated teller machine), a
DVD kiosk
Game controllers
- Gamepads
- Joysticks and wheels
- Light guns
- Dance pads
- Motion-sensing controllers
Is an input device that directs movements and actions of
on-screen objects
Input Device : Summary
30

31. Define Output Device
• An output device is any type of hardware
components that conveys information to one or
more people
Speakers,
headphones,
and earbuds
Display devices Printers Data projectors
Force-feedback
game
controllers
Interactive
whiteboards Tactile output
30
31

32. Display Devices
•
•
31
32
A display device
visually conveys
text, graphics and
video information
A monitor is
packaged as a
separate peripheral
- LCD monitor
- Widescreen

33. Display Devices
•
A CRT monitor is a desktop monitor that contains
a cathode-ray tube
–
Have a much larger footprint than do LCD monitors
32
33

34. Display Devices
•
•
•
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Figure 6-9
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Discovering Computers : Chapter 6
34
Television also are good output
device
- require a converter if you are
connecting your computer to an
analog television
Digital television (DTV) offers a
crisper, higher-quality output
HDTV is the most advanced
form of digital television

35. Printers
•
A printer produces text and
graphics on a physical medium
– Printed information is called a
hard copy, or printout
– Landscape or portrait
orientation
Examples: ink-jet printers, dot-
matrix printers, photo
printers, laser printers, thermal
printers, mobile printers, label
and postage printers, plotters,
and large-format printers.
•
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Figure 6-11
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Discovering Computers : Chapter 6
35

36. Printer
Large-format printer
Dot-matrix printer
Label and postage printer
35
36

37. Speakers, Headphones, and Earbuds
•
•
•
•
•
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Figure 6-26
Discovering Computers : Chapter 6 36
37
Most computer users attach speakers to their
computers to :
● Generate higher-quality sounds for playing games
● Interact with multimedia presentations
● listen to music
● view movies
An audio output device produces music,
speech,or other sound

38. •
•
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Figure 6-27
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Discovering Computers : Chapter 6
38
Speakers, Headphones and Earbuds
Headphones are
speakers that cover or
are placed outside of
the ear
Earbuds (also called
earphones) rest inside
the ear canal.

39. Speakers, Headphones, and Earbuds
•
Some speakers are specifically designed to play
audio from a portable media player
–
Wireless speakers
Page 324
Figure 6-28
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Discovering Computers : Chapter 6
39

40. Speakers, Headphones, and Earbuds
Voice output occurs when you hear a person’s
voice or when the computer talks to you through
the speakers
-Some Web sites dedicate themselves to
providing voice output
- Often works with voice input
- VoIP uses voice output and voice input
Page 325 Discovering Computers : Chapter 6 39
40

41. Other Output Devices
•
Other output devices are available for specific
uses and applications
Interactive
whiteboardsData projectors
Force-
feedback
game
controllers
Tactile
output
40
Touch screen
monitor
41

42. Other Output Devices
•
41
42
A data projector is
a device that takes
the text and images
displaying on a
computer screen
and projects them on
a larger screen
- LCD projector
- Digital light
processing (DLP)
projector

43. Other Output Devices
•
42
43
An interactive whiteboard is a touch-sensitive device,
resembling a dry-erase board, that displays the image
on a connected computer screen.

44. Other Output Devices
•
•
43
44
Force-feedback send
resistance to the device
is response to actions
of the user.
Tactile output
provides the user with
a physical response
from the device

45. Other Output Devices
• A touch screen monitor is a monitor
screen that can detect and respond to
something, such as a finger or stylus, pressing
on it.
42
45

46. 3
Output Device : Summary
Type Description
Display device
- LCD monitor
- CRT monitor
- Plasma monitor
An output device that convey information to
the user in the form of text, graphics and
video
LCD monitor : is a desktop monitor that used
liquid crystal display to produce images
CRT monitor : is a desktop monitor that
contains a cathode ray tube
Plasma monitor : is a display device that uses
gas plasma technology
2846

47. 3
Output Device : Summary
Type Description
Printers
- Ink-jet printer
- Dot-matrix printer
- Photo printers
- Laser printers
- Thermal printers
- Mobile printers
- Label and postage
printers
- Plotters
- large -format printers
An output device that convey information to
the user in the form of text and graphics on a
physical medium (hard copy or print out)
47

48. 3
Output Device : Summary
Type Description
Speakers, headphone, and
earbuds
An output device that convey information to
the user in the form of music, speech and
other sounds
Voice output - occurs when you hear a
person’s voice or when the computer talks
through the speakers
Data projector
- LCD projector
- Digital light processing
(DLP) projector
An output device that takes the text and
images displaying on a screen and projects
them on a larger screen
Interactive whiteboard An output device that touch-sensitive device,
resembling a dry-erase board, that displays
the image on a connected computer screen 48

49. 3
Output Device : Summary
Type Description
Force-feedback game
controllers
An output device that send resistance to the
device in response to action of the user
Tactile output An output device that provides the user with a
physical response from the device
49

50. 3
Input Output Devices
50
● A devices that can be both input and output
devices.
● Example :
○ Touch screen
○ Digital camera
○ Headsets - Headset consists of Speakers and
Microphone. Speaker act Output Device and
Microphone act as Input device
○ Facsimile (Fax Machine) - It has scanner to
scan the document and also have printer to
Print the document