Objectives Overview

Discovering Computers Fundamentals,

2010 EditionLiving in a Digital World

Discovering Computers Fundamentals, 2010 Edition Chapter 5

2

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

See Page 187 for Detailed Objectives


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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

See Page 187 for Detailed Objectives


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What Is Input?

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

Pages 188– 189 Figure 5-1


5

What Is Input?

An input device is any hardware component that allows users to enter data and

instructions into a computer

Page 188


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Keyboard and 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 189


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

Page 190 Figure 5-2


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Page 190

• Most desktop computer keyboards have…

Between 101 and 105 keys

A numeric keypad on the right side of

the keyboard

Function keys, CTRL keys, ALT

keys, and arrow keys

WINDOWS key APPLICATION key Toggle keys


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• 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 190

Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Ergonomics below Chapter 5

http://www.scsite.com/dcf2010cp/ch5/weblink/



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• 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

Page 191 Figure 5-3


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• 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 191 – 192Figure 5-4


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Keyboard and Pointing DevicesTrackball

• 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

Poin

ting

Stick

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

Page 192Figures 5-5 – 5-7


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Touch Screens and Touch-Sensitive Pads

• A touch screen is a touch-sensitive display device

Page 193Figure 5-8


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Touch Screens and Touch-Sensitive Pads

Microsoft Surface Touch-sensitive pads



15

Pen Input

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

Page 194 Figure 5-11


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Other Types of Input



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

Pages 196 - 197

Gamepads Joysticks and Wheels Light guns Dance pads

Motion-sensing

controllersWii Remote


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19


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

Page 197

Studio cameras

Field cameras

Point-and-shoot camera


20


• 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

Page 198


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



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

Page 199

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


23


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

Page 199

Capture video and still images

Send e-mail messages with

video attachments

Add live images to instant messages

Broadcast live images over the

Internet

Make video telephone calls


24


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



25



• A flatbed scanner creates a file of the document in memory– Works in a manner similar to a copy machine


26


• 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 200Figure 5-19


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• 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

Page 200


28


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



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• 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 201

Inventory Location of soldiers

Employee wardrobes

Airline baggage

Gauging tire pressure and temperature

Library books Prepaid tolls


30


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

Pages 201 - 202 Figure 5-22

Credit cards

Entertainment cards

Bank cards

Other similar cards


31


• 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



32


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

Pages 202 - 203

Fingerprint reader

Face recognition

system

Hand geometry

system

Voice verification

system

Signature verification

system

Iris recognition system

Retinal scanners


33


Pages 202 – 203Figures 5-24 – 5-25

fingerprint reader

iris recognition

system


34


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

Pages 204 – 205Figures 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

Discovering Computers 2010: Living in a Digital World Chapter 6

35

What Is Output?

• Output is data that has been processed into a useful form

Pages 206 – 207 Figure 5-29


36

What Is Output?

• An output device is any type of hardware component that conveys information to one or more people

Page 206

Display devices Printers

Speakers, headphones, and earbuds

Data projectors

Interactive whiteboards


37

Display Devices

• A display device visually conveys text, graphics, and video information

• A monitor is packaged as a separate peripheral– LCD monitor– Widescreen

Pages 207 – 208Figure 5-30


38

Display Devices

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

Page 209

Resolution Response time Brightness

Dot pitch Contrast ratio


39

Display Devices

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



40

Display Devices

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



41

Printers

• A printer produces text and graphics on a physical medium

• Before purchasing a printer, ask yourself a series of questions



42

Printers



43

Printers

• A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper

Page 213

Ink-jet printers

Photo printers

Laser printers

Thermal printers

Mobile printers Plotters

Large-format printers


44

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



45

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 screenPage 214


46

Printers


Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Photo Printers below Chapter 5




47

Printers

Laser printer

High-speed

High-quality

Color

Black-and-

white


Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Laser Printers below Chapter 5




48

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



49

Printers

• A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper


Thermal wax-transfer printer

Dye-sublimation printer


50

Printers

• A mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a mobile device



51

Printers

• Plotters are used to produce high-quality drawings

• Large-format printers create photo-realistic quality color prints on a larger scale



52

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

Page 217

Dot-matrix printer

Line printer


53

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



54

Other Output Devices

• An audio output device produces music, speech, or other sounds


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


55


• Headphones are speakers that cover your head or are placed outside of the ear

• Earbuds (also called earphones) rest inside the ear canal

Page 218

Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Earbudsbelow Chapter 5




56


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 218


57


• A data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen– Digital light processing

(DLP) projector



58

Putting It All Together



59




60




61

Input and Output Devices for Physically Challenged Users

Braille printer

Pages 220 – 221Figures 5-47 – 5-48

Head-mounted pointer


62

Summary

Various techniques for entering input and

several commonly used input device

Various methods of output and several

commonly used output devices

Page 222

Discovering Computers Fundamentals,

2010 EditionLiving in a Digital World

Chapter 5 Complete

Objectives Overview

Documents

edition chapter

pointing device

input device

touch screens

devicesa keyboard

pen inputwith pen input

predictive text input

devicesan ergonomic