CHAPTER 02-Input Device

8/12/2019 CHAPTER 02-Input Device

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Living in a Digital World

Discovering

Computers 2010


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Objectives Overview

Define input and differentiateamong a program, command, and

user response

Identify the keys and buttonscommonly found on desktop

computer keyboards, anddescribe how keyboards for

mobile computers and devicesdiffer from desktop computerkeyboards

Describe different mouse typesand explain how to use a mouse

Describe various types of touch

screens and explain how a touch-sensitive pad works

Describe various types of pen

input, and identify other types ofinput for smart phones

Summarize the purpose of variousgame controllers

Discovering Computers 2010: Living in a Digital World

Chapter 52See Page 257

for Detailed Objectives


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Objectives Overview

Explain how resolutionaffects the quality of a

picture captured on adigital camera

Describe the uses ofvoice recognition,

Web cams, and videoconferencing

Discuss how variousscanners and reading

devices work

Summarize the variousbiometric devices

Discuss how POS

terminals, automatedteller machines, andDVD kiosks work

Identify alternative

input devices forphysically challengedusers


Chapter 53See Page 257

for Detailed Objectives


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What Is Input?

Inputis any data and instructions entered into the

memory of a computer


Chapter 54Pages 258259

Figure 5-1


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What Is Input?


Chapter 55Pages 258 - 259

Instructions can be entered into the computer in the

form of programs, commands, and user responsesA program is a series of related

instructions that tells a computer what

tasks to perform and how to performthem

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


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What Are Input Devices

An input deviceis any hardware

component thatallows users toenter data and

instructions into

a computer


Chapter 56Page 260


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The Keyboard

A keyboardis an input device that contains keys

users press to enter data and instructions into a

computer


Chapter 57Page 560

Figure 5-2


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The Keyboard



Most desktop computer keyboards have


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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


Chapter 59Page 261

Figure 5-3


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The Keyboard

USB port

Keyboardport

WiredKeyboards

Bluetooth

IrDA

WirelessKeyboards


Chapter 510Page 262


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The Keyboard

An ergonomic keyboard has a design that reduces

the chance of wrist and hand injuries

Ergonomicsincorporates comfort, efficiency, and

safety into the design of the workplace


Chapter 511Page 262

Figure 5-4

Click to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Ergonomicsbelow Chapter 5
http://www.scsite.com/dc2010cp/ch5/weblink/


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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 phones

keypad



Figure 5-5


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Pointing Devices


Chapter 513Page 263


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Mouse

A mouseis 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



Figures 5-6 and 5-7


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Mouse

Mouse operations


Chapter 515Page 264

Figure 5-8

Point Click Right-click Double-click

Triple-click Drag Right-dragRotatewheel

Free-spinwheel

Press wheel Tilt wheelPress thumb

button


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Other Pointing Devices

Trackb

all A trackballis a

stationarypointingdevice with aball on its topor side T

ouchp

ad

A touchpadis

a small, flat,rectangularpointingdevice that issensitive topressure and

motion P

ointing

St

ick A pointing

stick is apressure-sensitivepointingdevice shapedlike a pencil

eraser that ispositionedbetween keyson a keyboard



Figures 5-95-11


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Touch Screens and Touch-Sensitive Pads

A touch screenis a touch-sensitive display device


Chapter 517Page 266

Figures 5-125-13

Click to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Multi-Touch Screensbelow Chapter 5


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Touch Screens and Touch-Sensitive Pads

Microsoft Surface Touch-sensitive pads


Chapter 518Page 267

Figures 5-145-15


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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


Chapter 519Page 268

Figure 5-16

Click to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Signature CapturePads below Chapter 5


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Other Input for Smart Phones


Chapter 520Page 269

Figures 5-175-18


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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


Chapter 521Page 270

GamepadsJoysticksand

WheelsLight guns

Dance pads

Motion-sensing

controllersClick to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Wii Remotebelow Chapter 5


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Game Controllers


Chapter 522Page 270

Figure 5-19


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Digital Cameras

A digital camerais a mobile device that allows

users to take pictures and store them digitally


Chapter 523Page 272

Studio cameras

Field cameras

Point-and-shoot camera


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Digital Cameras


Chapter 524Page 272

Figure 5-20


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Digital Cameras

Two factors affect the quality of digital camera photos:


Chapter 525Page 273

Resolutionis the number of horizontaland vertical pictures in a display device

A pixel is the smallest element in anelectronic displayResolution

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 thatcan be represented

Number of bitsstored in eachpixel


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Voice Input

Voice inputis the

process of entering

input by speaking into a

microphone Voice recognitionis the

computers capability of

distinguishing spoken

words


Chapter 526Page 274

Figure 5-22


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Voice Input

Audio inputis the process of entering any sound

into the computer


Chapter 527Page 274

Speech

Music

Sound Effects


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Voice Input

Music production software allows users to record,

compose, mix, and edit music and sounds


Chapter 528Page 274

Figure 5-23


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Video Input

Video inputis the process of capturing full-motion images and

storing them on a computers storage medium


Chapter 529Page 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 Input


Chapter 530Page 275

Figure 5-24


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Video: Video Editing on Your Computer


Chapter 531

CLICK TO START
http://localhost/var/www/apps/conversion/tmp/scratch_7/05_is_videoediting_a.wmvhttp://localhost/var/www/apps/conversion/tmp/scratch_7/05_is_videoediting_a.wmvhttp://localhost/var/www/apps/conversion/tmp/scratch_7/05_is_videoediting_a.wmv


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Video Input

A Web camis a type of digital video camera that

enables a user to:



Capture video andstill images

Send e-mailmessages with

video attachments

Add live images toinstant messages

Broadcast liveimages over the

Internet

Make videotelephone calls

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


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Scanners and Reading Devices

Light-sensing input device that reads printed text

and graphics and then translates the results into a

form the computer can process

Device can capture data directly from source

document include optical scanners, optical

readers, bar code readers, RFID readers, magnetic

stripe card readers, and magnetic ink characterrecognition readers.


Chapter 534


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Flatbed

Pen or Handheld

Sheet-fed

Drum


Chapter 535Page 277

Figure 5-27


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Chapter 536Page 278

Figure 5-28


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Optical character recognition (OCR)involves reading

characters from ordinary documents

A turnaround documentis a document you return to the

company that creates and sends it


Chapter 537Page 279

Figures 5-295-30


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Optical mark

recognition (OMR)

reads hand-drawn

marks such as smallcircles or rectangles

An OMR device scans

the documents and

matches the patterns oflight

Discovering Computers 2010: Living in a Digital WorldChapter 5

38Page 279Figure 5-31


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A bar code reader, also

called a bar code

scanneruses laser

beams to read barcodes



Click to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Bar Code Readersbelow Chapter 5


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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 readerreads information on the tag via radio waves

RFID can track:


40Page 280

InventoryLocation of

soldiersEmployeewardrobes

Airlinebaggage

Gauging tirepressure andtemperature

Library books Prepaid tolls


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Magnetic stripe card readersread the magnetic

stripe on the back of cards such as:



Credit cards

Entertainment cards

Bank cards

Other similar cards


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MICR(magnetic ink character recognition) devices read text

printed with magnetized ink

An MICR readerconverts MICR characters into a form the

computer can process

Banking industry uses MICR for check processing



Wh t' th diff b t th MICR d


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What's the difference between the MICR and

the OCR Reader?

Answer: The MICR reader will read the MICR line

informationon your check which is printed with a

special magnetic inkwhile the OCR reader will

read a sequence of characters, numbers orbarcodes,etc that may be found on your stub

which wasprinted using a generic ink.


43


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Data collection devicesobtain data directly atthe location where thetransaction or event

takes place Used in:

Restaurants

Grocery stores

Factories

Warehouses

The outdoors




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Biometric Input

Biometrics authenticates a persons identity by

verifying a personal characteristic


45Pages 282 - 283

Fingerprint

reader

Face

recognitionsystem

Hand

geometrysystem

Voiceverification

system

Signatureverification

system

Iris recognitionsystem

Retinalscanners


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Biometric Input


46Pages 282283Figures 5-375-39

Click to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Biometric Inputbelow Chapter 5

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


47Pages 284285Figures 5-405-42

A POS terminal

records purchases,processespayment, and

updates inventory

An automated

teller machine(ATM) allows usersto access theirbank accounts

A DVD kioskis a

self-service DVDrental machine


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Putting It All Together




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Input Devices for Physically Challenged Users

Several input devices are available to assist

physically challenged users:


51Page 286

Keyguard

Keyboards

with largerkeys

On-screen

keyboard

Variouspointingdevices

Head-mountedpointer

Gesturerecognition

Computerizedimplantdevices

Click to view Web Link,click Chapter 5, Click WebLink from left navigation,then click Gesture Recognitionbelow Chapter 5


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Input Devices for Physically Challenged Users

Keyboard with larger keys Head-mounted pointer


52Page 286Figures 5-445-45


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Summary

Various techniques of enteringinput

Several commonly used inputdevices

Keyboard, mouse, and otherpointing devices; touch screens,

pen input, other input for smartphones, game controllers, digital

cameras, voice input, video input,scanners and reading devices,biometric input, and terminals

Input devices for physicallychallenged users


53Page 287


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Living in a Digital World

Discovering

Computers 2010

Documents

CHAPTER 02-Input Device