Living in a Digital World
Discovering
Computers 2011
Objectives Overview
Define input and differentiate among a program, command, and
user response
Define input and differentiate among a program, command, and
user response
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
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 and explain how to use a mouse Describe different mouse types and explain how to use a mouse
Describe various types of touch screens and explain how a touch-
sensitive pad works
Describe various types of touch screens and explain how a touch-
sensitive pad works
Describe various types of pen input, and identify other types of
input for smart phones Describe various types of pen input, and identify other types of
input for smart phones
Summarize the purpose of various game controllers Summarize the purpose of
various game controllers
Discovering Computers 2011: Living in a Digital World 2
See Page 257
Objectives Overview
Explain how resolution affects the quality of a
picture captured on a digital camera
Explain how resolution affects the quality of a
picture captured on a digital camera
Describe the uses of voice recognition, Web cams, and video
conferencing
Describe the uses of voice recognition, Web cams, and video
conferencing
Discuss how various scanners and reading
devices work
Discuss how various scanners and reading
devices work
Summarize the various biometric devices Summarize the various
biometric devices
Discuss how POS terminals, automated
teller machines, and DVD kiosks work Discuss how POS terminals, automated
teller machines, and DVD kiosks work
Identify alternative input devices for physically challenged
users
Identify alternative input devices for physically challenged
users
Discovering Computers 2011: Living in a Digital World Chapter 5
See Page 257 3
for Detailed Objectives
What Is Input?
• Input is any data and instructions entered into the memory of a computer
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Pages 258 – 259
What Is Input?
Discovering Computers 2011: Living in a Digital World Chapter 5
Pages 258 - 259 5
• Instructions can be entered into the computer in the form of programs, commands, and user responses
A program is a series of related instructions that tells a computer what tasks to perform and how to
perform them
A program is a series of related instructions that tells a computer what tasks to perform and how to
perform them
Programs respond to commands that a user issues Programs respond to commands that a user issues
A user response is an instruction a user issues by
replying to a question displayed by a program
A user response is an instruction a user issues by
replying to a question displayed by a program
What Are Input Devices
An input device is any hardware component that
allows users to enter data and instructions into
a computer An input device is any hardware component that
allows users to enter data and instructions into
a computer
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Page 260
The Keyboard
• A keyboard is an input device that contains keys users press to enter data and instructions into a computer
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 260 7 Figure 5-2
The Keyboard
Discovering Computers 2011: Living in a Digital World 8
Pages 260 - 261
• Most desktop computer keyboards have…
Between 101 and 105 keys
Between 101 and 105 keys
A numeric keypad on the right side of
the keyboard A numeric keypad on the right side of
the keyboard
Function keys, CTRL keys, ALT keys, and arrow
keys
Function keys, CTRL keys, ALT keys, and arrow
keys
WINDOWS key
WINDOWS key APPLICATION key APPLICATION key Toggle keys Toggle keys
The Keyboard
• The insertion point, also known as the cursor, is a symbol on the screen that indicates where the
next character you type will appear
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Page 261 9 Figure 5-3
The Keyboard
USB port USB port
Wired Keyboards
Wired Keyboards
Bluetooth Bluetooth
IrDA IrDA
Wireless Keyboards
Wireless Keyboards
Discovering Computers 2011: Living in a Digital World 10
Page 262
The Keyboard
• An ergonomic keyboard has a design that reduces the chance of wrist and hand injuries
• Ergonomics incorporates comfort, efficiency, and safety into the design of the workplace
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 262 11 Figure 5-4
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Ergonomics below Chapter 5
The Keyboard
• 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
Discovering Computers 2011: Living in a Digital World 12
Pages 262 – 263
Pointing Devices
A pointing device is an input device that allows
a user to control a pointer on the screen
A pointer is a small symbol on the screen
whose location and shape change as a user moves a pointing device
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Page 263 13
Mouse
• A mouse is a pointing device that fits under the palm of your hand comfortably
– Most widely used pointing device on desktop computers
• A mouse can be wired or wireless
Discovering Computers 2011: Living in a Digital World 14
Pages 263 – 264
Mouse
• Mouse operations
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 264 15 Figure 5-8
Point
Point Click Click Right-click Right-click Double-click Double-click
Triple-click
Triple-click Drag Drag Right-drag Right-drag Rotate wheel Rotate
wheel
Free-spin wheel Free-spin
wheel Press wheel Press wheel Tilt wheel Tilt wheel Press thumb button
Press thumb
button
Other Pointing Devices
Tr ac kb al l
• A trackball is a stationary
pointing
device with a ball on its top or side
• A trackball is a stationary
pointing
device with a ball on its top
or side To u ch p ad • A touchpad is a small, flat, rectangular pointing
device that is sensitive to pressure and motion
• A touchpad is a small, flat, rectangular pointing
device that is sensitive to pressure and
motion Po in ti n g Sti ck • A pointing stick is a pressure- sensitive pointing
device shaped like a pencil eraser that is positioned between keys on a keyboard
• A pointing stick is a pressure- sensitive pointing
device shaped like a pencil eraser that is positioned between keys on a keyboard
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Pages 265 – 266
Touch Screens and Touch-Sensitive Pads
• A touch screen is a touch-sensitive display device
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 266 17
Figures 5-12 – 5-13
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Multi-Touch Screens
below Chapter 5
Touch Screens and Touch-Sensitive Pads
Microsoft Surface Touch-sensitive pads
Discovering Computers 2011: Living in a Digital World 18
Page 267
Pen Input
• With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 268 19 Figure 5-16
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Signature Capture Pads below Chapter 5
Other Input for Smart Phones
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Page 269
Game Controllers
• Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects
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Pages 270 - 271 21
Gamepads
Gamepads Joysticks and Wheels
Joysticks and
Wheels Light guns Light guns
Dance pads Dance pads
Motion- sensing controllers
Motion- sensing controllers
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation, then click Game Controllers below Chapter 5
Game Controllers
Discovering Computers 2011: Living in a Digital World 22
Page 270
Digital Cameras
• A digital camera is a mobile device that allows users to take pictures and store them digitally
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Page 272 23
Studio cameras Studio cameras Field cameras Field cameras
Point-and-shoot camera
Point-and-shoot camera
Digital Cameras
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Page 272
Digital Cameras
• Two factors affect the quality of digital camera photos:
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Page 273 25
• Resolution is the number of horizontal and vertical pictures in a display device
• A pixel is the smallest element in an electronic display
• Resolution is the number of horizontal and vertical pictures in a display device
• A pixel is the smallest element in an electronic display
Resolution Resolution
• Each pixel consists of one or more bits of data
• The more bits used to represent a pixel, the more colors and shades of gray that can be represented
• Each pixel consists of one or more bits of data
• The more bits used to represent a pixel, the more colors and shades of gray that can be represented
Number of bits stored in
each pixel Number of bits stored in
each pixel
Voice 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
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Page 274
Voice Input
• Audio input is the process of entering any sound into the computer
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Page 274 27
Speech Speech
Music Music
Sound Effects
Sound Effects
Voice Input
• Music production software allows users to record, compose, mix, and edit music and sounds
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Page 274
Video Input
• Video input is the process of capturing full-motion images and storing them on a computer’s storage medium
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Page 275 29
Record video on a digital video (DV) camera or use a video capture card to convert analog signals to digital
Connect the camera to a port on the system unit
Transfer video and images
Video Input
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Page 275
Video: Video Editing on Your Computer
Discovering Computers 2011: Living in a Digital World Chapter 5
31
CLICK TO START
Video Input
• A Web cam is a type of digital video camera that enables a user to:
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Pages 275 - 276 32
Capture video and still images
Capture video and still images
Send e-mail messages with video attachments
Send e-mail messages with video attachments
Add live images to instant messages Add live images to
instant messages
Broadcast live images over the
Internet Broadcast live images over the
Internet
Make video telephone calls
Make video telephone calls
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Web Cams below Chapter 5
Video Input
• A video conference is a meeting between two or more geographically separated people
Discovering Computers 2011: Living in a Digital World Chapter 5
Pages 276 – 277 33 Figures 5-25 – 5-26
Scanners and Reading Devices
Flatbed Flatbed
Pen or Handheld Pen or Handheld
Sheet-fed Sheet-fed
Drum Drum
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Page 277
Scanners and Reading Devices
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 278 35 Figure 5-28
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
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Page 279
Scanners and Reading Devices
• 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
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 279 37 Figure 5-31
Scanners and Reading Devices
• A bar code reader, also called a bar code
scanner uses laser beams to read bar codes
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 280 38 Figure 5-32
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Bar Code Readers
below Chapter 5
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:
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 280 39
Tracking times of runners in a
marathon Tracking times of
runners in a marathon
Tracking location of soldiers Tracking location
of soldiers Employee wardrobes Employee
wardrobes Airline baggage Airline baggage Checking lift tickets of skiers
Checking lift tickets of skiers
Managing inventory Managing
inventory
Gauging pressure and temperature
of tires
Gauging pressure and temperature
of tires
Checking out library books Checking out
library books Tracking toll payments Tracking toll
payments
Scanners and Reading Devices
• Magnetic stripe card readers read the magnetic stripe on the back of cards such as:
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Page 281
Credit cards Credit cards
Entertainment cards Entertainment cards Bank cards
Bank cards
Other similar cards
Other similar cards
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
• Banking industry uses MICR for check processing
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 281 41 Figure 5-35
Scanners and Reading Devices
• Data collection devices obtain data directly at the location where the
transaction or event takes place
• Used in:
– Restaurants – Grocery stores – Factories
– Warehouses – The outdoors
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Page 282
Biometric Input
• Biometrics authenticates a person’s identity by verifying a personal characteristic
Discovering Computers 2011: Living in a Digital World Chapter 5
Pages 282 - 283 43
Fingerprint reader Fingerprint
reader
Face recognition
system Face recognition
system
Hand geometry
system Hand geometry
system Voice
verification system
Voice verification
system
Signature verification
system Signature verification
system
Iris recognition system
Iris recognition system
Retinal scanners
Retinal
scanners
Biometric Input
Discovering Computers 2011: Living in a Digital World Chapter 5
Pages 282 – 283 44 Figures 5-37 – 5-39
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Biometric Input
below Chapter 5
fingerprint reader
hand geometry
system
iris recognition
system
Terminals
• A terminal is a computer that allows users to send data to and/or receive information from a host computer
Discovering Computers 2011: Living in a Digital World Chapter 5
Pages 284 – 285 45 Figures 5-40 – 5-42
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
Putting It All Together
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Page 285
Putting It All Together
Discovering Computers 2011: Living in a Digital World Chapter 5
Page 285 47 Figure 5-43
Putting It All Together
Discovering Computers 2011: Living in a Digital World 48
Page 285
Input Devices for Physically Challenged Users
• Several input devices are available to assist physically challenged users:
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Page 286 49
Keyguard
Keyguard Keyboards with larger
keys Keyboards with larger
keys
On-screen keyboard On-screen
keyboard Various
pointing devices Various pointing
devices
Head- mounted
pointer Head- mounted
pointer
Gesture recognition
Gesture recognition Computerized
implant devices Computerized
implant devices
Click to view Web Link,
click Chapter 5, Click Web Link from left
navigation,
then click Gesture Recognition
below Chapter 5
Input Devices for Physically Challenged Users
Keyboard with larger keys Head-mounted pointer
Discovering Computers 2011: Living in a Digital World 50
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Summary
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