2. Input Devices
• Communication Skills
Faizan Atteeq
S3f13asoc0125

3. Information Process Structure
Input
Process
Output

4. INPUT
Input:
Anything that is given to computer to
process and convert into information is
called input.
e.g text, speech, video and digital
signals.

5. Input Devices
Introduction to computer input devices
 A device that can be used to insert data
into a computer or other computational
device
 Any hardware device that sends data to
the computer, without any input devices,
a computer would only be a display
device and not allow users to interact
 Computer works with the commands an
the input given by the user

6. Input Devices
Types of input devices:
There are two types of input devices:
1. Manual Input:
 Keyboard
 Mouse
 Track Ball
 Joystick
 Microphone
 Digital Camera
 Scanner

7. Input Devices
2. Automatic Input:
 MICR (Magnetic Ink Character
Recognition)
 OMR (Optical Mark Recognition)
 OCR (Optical Character
Recognition)
 Barcode reader
 Magnetic Stripe
 Sensors

8. Manual

9. Keyboard
Used to input text data into the
computer
Advantage
 They are very common; all computers
have one and they are easy to use.
Disadvantage
 Easy to make mistakes if you can’t type
quickly.

10. Mouse
Enables you to control the movement
of the on screen curser by moving it
around a surface
Advantage
 Easy to learn to use
 Accurate for selecting things
Disadvantage
 Need a flat space next to the computer.

11. Track Ball
Like an upside down mouse, you
turn it with your hand to move the
pointer on the screen
• Advantage
 Ideal for using when flat space next
to computer is limited
• Disadvantage
 Not very easy to use.

12. Joystick
• Similar to a tracker ball in operation
except you have a stick which is
moved rather than a rolling ball.
• Advantage
 Faster than mouse and performs
immediate action .
• Disadvantage
 Some people find them more difficult
to use than mice.

13. Microphone
Used to input sound
• Advantages
 Some systems can understand most
peoples voices with voice recognition
software
• Disadvantages
 Some systems need to be trained to
understand each different voice.

14. Digital Camera
Looks very similar to a traditional
camera. However, unlike
photographic cameras, digital
cameras do not use film
 Advantage
 No film needed.
 Images can be digitally manipulated
 Disadvantage
 Need to print out photographs

15. Scanner
Another way in which we can capture
still images or text to be stored and
used on a computer.
• Advantage
 Can input things from paper
documents
 With OCR software, text can be
scanned in
• Disadvantage
 Images can take up a lot of memory
space.

16. AUTOMATIC

17. MICR
Stands for Magnetic Ink Character
Recognition. Banks use them; the
reader reads the numbers on a
cheque.
• Advantage
 Read at 100% accuracy..
• Disadvantage
 The reader and ink is expensive

18. OMR
Stands for Optical Mark Reader.
Reads pencil marks on a specially
designed form or document, e.g. on a
lottery ticket.
• Advantage
 Fast and accurate way of inputting
information.
• Disadvantage
 Only works if the marks have been
made accurately and clearly.

19. OMR Pattern

20. Barcode reader
A bar code reader uses a visible red
light to scan and read the barcode.
• Advantage
 Any price change only needs to be
changed on the computer system,
not on each item.
• Disadvantage
 Does not reads if surface is reflective
due to humidity or if oily.

21. Thank You For Precious
Time