Discovering Computers Fundamentals,

parisfawnAI and Robotics

Nov 17, 2013 (3 years and 10 months ago)

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Discovering Computers Fundamentals,
2012 Edition

Chapter
Five: Input

Objectives Overview

Identify the keys and buttons
commonly found on desktop
computer keyboards, and
describe how keyboards for
mobile computers and devices
differ from desktop computer
keyboards

Describe different mouse types

Describe various types of touch
screens and explain how a
touch
-
sensitive pad works

Describe various types of pen
input

2

See Page 187

for Detailed Objectives

Objectives Overview

Explain other types of
input

Explain the characteristics
of LCD monitors, LCD
screens, and CRT monitors

Summarize the various
types of printers

Identify the purpose and
features of speakers,
headphones, and ear
-
buds; data projectors; and
interactive whiteboards

Identify input and output
options for physically
challenged users

3

See Page 187

for Detailed Objectives

What Is Input?


Input

is any data and instructions entered
into the memory of a computer

4

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189

Figure 5
-
1

What Is Input?

An
input device
is any hardware
component that
allows users to
enter data and
instructions into
a computer

5

Page 188

Keyboard and Pointing Devices


A
keyboard

is an input device that
contains keys users press to enter data and
instructions into a computer


6

Page 190

Figure 5
-
2

Keyboard and Pointing Devices


Keyboards on mobile devices typically are smaller
and/or have fewer keys


Some phones have predictive text input, which
saves time when entering text using the phone’s
keypad

7

Page 191

Figure 5
-
3

Keyboard and Pointing Devices

Trackball


A
trackball

is a
stationary
pointing
device with a
ball on its top
or side

Touchpad


A
touchpad

is
a small, flat,
rectangular
pointing
device that is
sensitive to
pressure and
motion

Pointing Stick


A
pointing
stick
is a
pressure
-
sensitive
pointing
device shaped
like a pencil
eraser that is
positioned
between keys
on a keyboard

8

Page 192

Figures 5
-
5


5
-
7

Touch Screens and Touch
-
Sensitive
Pads


A
touch screen

is a touch
-
sensitive display
device

9

Page 193

Figure 5
-
8

Touch Screens and Touch
-
Sensitive
Pads

Microsoft Surface

Touch
-
sensitive pads

10

Page 193

Figures 5
-
9


5
-
10

Pen Input


With
pen input
, you touch a
stylus

or
digital
pen
on a flat surface to write, draw, or make
selections

11

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Figure 5
-
11

Other Types of Input

12

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Figure 5
-
12

Other Types of Input

13

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Figure 5
-
13

Other Types of Input

14

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Figure 5
-
14

Other Types of Input


Two factors affect the quality of digital camera
photos:

15

Page 198


Resolution

is the
number of horizontal
and vertical pixels in
a display device


A
pixel

is the smallest
element in an
electronic display

Resolution

Other Types of Input


Voice input

is the process of entering
input by speaking into a microphone


Voice recognition

is the computer’s
capability of distinguishing spoken words


Audio input

is the process of entering any
sound into the computer

16

Page 198

Other Types of Input


A
video conference

is a meeting between two or
more geographically separated people

17

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Figures 5
-
16


5
-
17

Other Types of Input

18

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Figure 5
-
18


A
flatbed scanner
creates a file of the
document in memory


Works in a manner similar to a copy machine

Other Types of Input


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

19

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Figure 5
-
19

Other Types of Input


Optical mark recognition
(
OMR
) reads
hand
-
drawn marks such as small circles or
rectangles

20

Page 200

Other Types of Input


A
bar code reader
,
also called a bar code
scanner uses laser
beams to read
bar
codes

21

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Figure 5
-
20

Other Types of Input


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:

22

Page 201

Times of
runners in a
marathon

Location of
soldiers

Employee
wardrobes

Airline
baggage

Lift tickets of
skiers

Inventory

Pressure and
temperature
of tires

Checked out
library books

Toll payments

Other Types of Input


Magnetic stripe card readers

read the
magnetic stripe on the back of cards such
as:

23

Pages 201

Figure 5
-
22

Credit cards

Entertainment cards

Bank cards

Other similar cards

Other Types of Input


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


Banking industry uses MICR for check processing

24

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Figure 5
-
23

Other Types of Input


Biometrics

authenticates a person’s
identity by verifying a personal
characteristic

25

Pages 202
-

203

Fingerprint
reader

Face
recognition
system

Hand
geometry
system

Voice
verification
system

Signature
verification
system

Iris recognition
system

Retinal
scanners

Other Types of Input

26

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203

Figures 5
-
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5
-
25

fingerprint
reader

iris
recognition
system

Other Types of Input


A
terminal

is a computer that allows users to
send data to and/or receive information from a
host computer

27

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205

Figures 5
-
26


5
-
28

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

What Is Output?


Output

is data that has been processed
into a useful form

28

Pages 206


207

Figure 5
-
29

Display Devices


A
display device

visually conveys
text, graphics, and
video information


A
monitor

is
packaged as a
separate peripheral


LCD monitor


Widescreen

29

Pages 207


208

Figure 5
-
30

Display Devices


Liquid crystal display
(
LCD
) uses a liquid compound to
present information on a display device

30

Page 209

Resolution

Response time

Brightness

Dot pitch

Contrast ratio

Display Devices


Plasma monitors

are display devices that use
gas plasma technology and offer screen sizes up to
150 inches

31

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Figure 5
-
32

Display Devices


A
CRT monitor

is a desktop monitor that
contains a cathode
-
ray tube

32

Page 210

Figure 5
-
33

Printers


A
printer

produces text
and graphics
on a physical
medium


Before
purchasing a
printer, ask
yourself a
series of
questions

33

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Figure 5
-
34

Printers


A
nonimpact printer

forms characters
and graphics on a piece of paper without
actually striking the paper

34

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Ink
-
jet
printers

Photo
printers

Laser
printers

Thermal
printers

Mobile
printers

Plotters

Large
-
format
printers

Printers


An
ink
-
jet printer

forms characters and graphics by
spraying tiny drops of liquid ink onto a piece of paper


Color or black
-
and
-
white


Printers with a higher dpi (dots per inch) produce a higher quality
output

35

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Figure 5
-
36

Printers

A
photo printer

produces color
photo
-
lab
-
quality pictures


Most use ink
-
jet technology


PictBridge

allows you to print photos
directly from a digital camera


Print from a memory card and preview
photos on a built
-
in LCD screen

36

Page 214

Printers

Laser
printer

High
-
speed

High
-
quality

Color

Black
-
and
-
white

37

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215

Figure 5
-
38

Printers


A
multifunction peripheral

(MFP) is a
single device that prints, scans, copies, and
in some cases, faxes


Sometimes called an all
-
in
-
one device

38

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Figure 5
-
39

Printers


A
thermal printer

generates images by
pushing electrically heated pins against the
heat
-
sensitive paper

39

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216

Figure 5
-
40

Dye
-
sublimation
printer

Printers


Plotters

are used to produce high
-
quality
drawings


Large
-
format printers

create photo
-
realistic quality color prints on a larger
scale

40

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Figure 5
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42

Printers


Impact printers

form characters and graphics
on a piece of paper by striking a mechanism
against an inked ribbon that physically contacts
the paper

41

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Dot
-
matrix
printer

Line
printer

Printers


A
dot
-
matrix
printer

produces
printed images when
tiny wire pins on a
print head
mechanism strike an
inked ribbon


A
line printer

prints an entire line
at a time

42

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Figure 5
-
43

Other Output Devices


An
audio output device

produces music,
speech, or other sounds

43

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Figure 5
-
44

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

Other Output Devices


Headphones

are
speakers that cover
or are placed outside
of the ear


Earbuds

(also called
earphones) rest
inside the ear canal

44

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Other Output Devices

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

45

Page 218

Other Output Devices


A
data projector
is
a device that takes
the text and images
displaying on a
computer screen and
projects them on a
larger screen

46

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Figure 5
-
45

Other Output Devices


An
interactive
whiteboard

is a
touch
-
sensitive
device, resembling a
dry
-
erase board, that
displays the image
on a connected
computer
screen

47

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Figure 5
-
46

Input and Output Devices

for Physically Challenged Users

Braille printer

48

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221

Figures 5
-
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5
-
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Head
-
mounted pointer