Discovering Computers 2012Chapter 5Understanding Input

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Your Interactive Guide to the Digital World

Discovering

Computers 2012 Chapter 5

Understanding Input

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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 2012: Chapter 5 2

See Page 257

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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

See Page 257

for Detailed Objectives

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What Is Input?

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

Pages 258 – 259

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What Is Input?

Pages 258 - 259

• 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

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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

Page 260

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The Keyboard

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

Page 260 Figure 5-2

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The Keyboard

Pages 260 - 261

• Most desktop computer keyboards have…

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

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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

Page 261 Figure 5-3

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The Keyboard

USB port USB port

Wired Keyboards

Bluetooth Bluetooth

IrDA IrDA

Wireless Keyboards

Page 262

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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

Page 262 Figure 5-4

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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

Pages 262 – 263

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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

Page 263

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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

Pages 263 – 264

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Mouse

• Mouse operations

Page 264 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

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Other Pointing Devices

Tr ac

kb all

• 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 uc hp 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

tin 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

Pages 265 – 266

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Touch Screens and Touch-Sensitive Pads

• A touch screen is a touch-sensitive display device

Page 266

Figures 5-12 – 5-13

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Touch Screens and Touch-Sensitive Pads

Microsoft Surface Touch-sensitive pads

Page 267

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Pen Input

• With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections

Page 268 Figure 5-16

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Other Input for Smart Phones

Page 269

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Game Controllers

• Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects

Pages 270 - 271

Gamepads

Gamepads Joysticks and Wheels

Joysticks and

Wheels Light guns Light guns

Dance pads Dance pads

Motion- sensing controllers

Motion-

sensing

controllers

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Discovering Computers 2012: Chapter 5 22 Page 270

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Digital Cameras

• A digital camera is a mobile device that allows users to take pictures and store them digitally

Page 272

Studio cameras Studio cameras Field cameras Field cameras

Point-and-shoot camera

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Digital Cameras

• Two factors affect the quality of digital camera photos:

Page 273

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

• A pixel is the smallest element in an electronic display

• Resolution is the number of horizontal and vertical pixels 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

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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

Page 274

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Voice Input

• Audio input is the process of entering any sound into the computer

Page 274

Speech Speech

Music Music

Sound Effects

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Voice Input

• Music production software allows users to record, compose, mix, and edit music and sounds

Page 274

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Video Input

• Video input is the process of capturing full-motion images and storing them on a computer’s storage medium

Page 275

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

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Video: Video Editing on Your Computer

CLICK TO START

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Video Input

• A Web cam is a type of digital video camera that enables a user to:

Pages 275 - 276

Capture video and still images

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

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Video Input

• A video conference is a meeting between two or more geographically separated people

Pages 276 – 277 Figures 5-25 – 5-26

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Scanners and Reading Devices

Flatbed Flatbed

Pen or Handheld Pen or Handheld

Sheet-fed Sheet-fed

Drum Drum

Page 277

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Scanners and Reading Devices

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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

Page 279

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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

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Scanners and Reading Devices

• A bar code reader, also called a bar code

scanner uses laser beams to read bar codes

Page 280

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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:

Page 280

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

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Scanners and Reading Devices

• Magnetic stripe card readers read the magnetic stripe on the back of cards such as:

Page 281

Credit cards Credit cards

Entertainment cards Entertainment cards Bank cards

Bank cards

Other similar cards

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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

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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

Page 282

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Biometric Input

• Biometrics authenticates a person’s identity by verifying a personal characteristic

Pages 282 - 283

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

Retinal scanners

Retinal

scanners

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Biometric Input

Pages 282 – 283

fingerprint reader

hand geometry system

iris recognition

system

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Terminals

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

Pages 284 – 285 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

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Putting It All Together

Page 285

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Putting It All Together

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Putting It All Together

Page 285

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Input Devices for Physically Challenged Users

• Several input devices are available to assist physically challenged users:

Page 286

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

Computerized implant

devices

Computerized implant

devices

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Input Devices for Physically Challenged Users

Keyboard with larger keys Head-mounted pointer

Page 286

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Summary

Various techniques of entering input

Various techniques of entering

input Several commonly used input

devices

Several commonly used input devices

Keyboard, mouse, and other pointing devices; touch screens, pen input, other input for smart phones, game controllers, digital cameras, voice input, video input,

scanners and reading devices, biometric input, and terminals

Keyboard, mouse, and other pointing devices; touch screens, pen input, other input for smart phones, game controllers, digital cameras, voice input, video input,

scanners and reading devices, biometric input, and terminals

Input devices for physically challenged users

Page 287

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Your Interactive Guide to the Digital World

Discovering

Computers 2012 Chapter 5

Understanding Input

Chapter 5 Complete

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