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Chapter 7

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Input and Output

Discovering Computers 2016

Tools, Apps, Devices, and the Impact of Technology

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Objectives Overview

See Page 318

for Detailed Objectives

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Differentiate among various types of keyboards: standard, compact, on-screen, virtual, ergonomic, gaming, and wireless

Describe characteristics of various pointing devices: mouse, touchpad, and trackball

Describe various uses of touch screens

Describe various types of pen input: stylus, digital pen, and graphics tablet

Describe various uses of motion input, voice input, and video input

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Objectives Overview

See Page 318

for Detailed Objectives

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Differentiate among various scanners and reading devices

Explain the characteristics of various displays

Summarize the various types of printers

Identify the purpose and features of speakers, headphones and earbuds, data projectors, interactive whiteboards, and force-feedback game controllers and tactile output

Identify various assistive technology input and output methods

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What Is Input?

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

Pages 318 – 319

Figure 7-1

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What Is Input?

Page 318

  • Commonly used input methods include:

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Keyboard

Pointing devices

Touch screens

Pen input

Motion input

Voice input

Video input

Scanners and reading devices

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Keyboards

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

​

Page 320

Figure 7-2

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Keyboards

Page 320

  • Most desktop computer keyboards have…

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Typing area

Function keys

Toggle key

Navigation keys

Keyboard shortcut keys

Media control buttons

Internet control buttons

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Keyboards

  • There are a variety of keyboard options for computers and mobile devices

Page 321

Figure 7-3

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Keyboards

  • An ergonomic keyboard has a design that reduces the chance of repetitive strain injuries of wrist and hand
  • Ergonomics incorporates comfort, efficiency, and safety in the design of the workplace

Page 322

Figure 7-4

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Pointing Devices

Page 322

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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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Pointing Devices

  • A mouse is a pointing device that fits under the palm of your hand comfortably
    • Optical mouse, laser mouse, and touch mouse

Paged 322 – 323

Figure 7-5

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Pointing Devices

Pages 323- 324

Figures 7-6 – 7-7

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Touchpad

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

Trackball

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

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Touch Screens

  • A touch screen is a touch-sensitive display

Pages 324 - 325

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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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

Pages 326 – 327

Figure 7-9

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Pen Input

  • A graphics tablet, also called a digitizer, is an electronic plastic board that detects and converts movements of a style or digital pen into signals that are sent to the computer

Page 328

Figure 7-11

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Motion, Voice, and Video Input

  • With motion input, sometimes called gesture recognition, users can guide on-screen elements using air gestures

Pages 328 - 329

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Motion, Voice, and Video Input

  • Voice input is the process of entering input by speaking into a microphone
  • Voice recognition, also called speech recognition, is the computer or mobile device’s capability of distinguishing spoken words

Page 330

Figure 7-12

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Motion, Voice, and Video Input

  • Audio input is the process of entering any sound into the computer such as speech, music, and sound effects
  • Music production software allows users to record, compose, mix, and edit music and sounds

Page 330

Figure 7-13

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Motion, Voice, and Video Input

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

Page 330

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Record video on a digital video (DV) camera

Transfer video to a computer or mobile device

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Motion, Voice, and Video Input

  • A webcam is a type of DV camera that enables a user to:

Page 332

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Capture video and still images

Send email messages with video attachments

Broadcast live images or video over the Internet

Conduct videoconferences

Make video calls

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Motion, Voice, and Video Input

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

Page 333

Figure 7-15

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Scanners and Reading Devices

Page 334

  • A scanner is a light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can process
    • A flatbed scanner works in a manner similar to a copy machine except it creates a file of the document in memory instead of a paper copy

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Scanners and Reading Devices

Page 334

Figure 7-16

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Scanners and Reading Devices

  • An optical reader is a device that uses a light source to read characters, marks, and codes and then converts them into digital data that a computer can process
    • Optical character recognition (OCR)
    • Optical mark recognition (OMR)

Page 335

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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
  • A QR code stores information in both a vertical and horizontal direction

Page 335

Figures 7-17 – 7-18

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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 336

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Tracking times of runners in a marathon

Tracking location of people and other items

Checking lift tickets of skiers

Managing inventory

Gauging temperature and pressure of tires on a vehicle

Checking out library books

Providing access to rooms or buildings

Managing purchases

Tracking payment as vehicles pass through booths on tollway systems

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Scanners and Reading Devices

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

Page 337

Figure 7-20

© 2016 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in whole or in part.

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Credit cards

Entertainment cards

Bank cards

Identification 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

Page 338

Figure 7-21

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Scanners and Reading Devices

  • A data collection device obtains data directly at the location where the transaction or event takes place

Page 338

Figure 7-22

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What Is Output?

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

Page 339

Figure 7-23

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Displays

  • A display visually conveys text, graphics, and video information
  • A monitor is a display that is packaged as a separate peripheral device
    • LCD monitor

Pages 340 - 341

Figure 7-24

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Displays

  • The quality of a display depends primarily on its:

Page 342

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Resolution

Response time

Brightness

Dot pitch

Contrast ratio

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Displays

  • Today’s monitors use a digital signal to produce a picture
  • To display the highest quality images, the monitor should plug into:
    • A DVI port
    • An HDMI port
    • A DisplayPort

Page 343

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Displays

  • Home users sometimes use a digital television (DTV) as a display
  • HDTV is the most advanced form of digital television
  • A Smart TV is an Internet-enabled HDTV

Page 343

Figure 7-25

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Printers

  • A printer produces text and graphics on a physical medium
  • Before purchasing a printer, ask yourself a series of questions

Pages 344 - 345

Figure 7-26

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Printers

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

Page 345

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Ink-jet printers

Photo printers

Laser printers

All-in-one printers

Thermal printers

Mobile printers

Label printers

Plotters

Large-format printers

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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
    • Speed is measured by the number of pages per minute (ppm) it can print

Page 345

Figure 7-27

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Printers

Page 347

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A photo printer produces lab-quality photos

    • Many use ink-jet technology
    • PictBridge allows you to print photos directly from a digital camera
    • Print from a memory card

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Printers

Page 347

Figure 7-29

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Printers

Page 348

Figure 7-30

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Laser printer

High-speed

High-quality

Color

Black-and-white

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Printers

  • An all-in-one printer is a single device that prints, scans, copies, and in some cases, faxes
    • Also called a multifunction printer

Page 349

Figure 7-32

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Printers

  • A 3-D printer uses a process called additive manufacturing to create an object by adding material to a three-dimensional object, one horizontal layer at a time

Page 349

Figure 7-33

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Printers

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

Page 349

Figure 7-34

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Dye-sublimation printer

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Printers

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

Page 350

Figure 7-35

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Printers

  • A label printer is a small printer that prints on an adhesive-type material that can be placed on a variety of items

Page 350

Figure 7-36

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Printers

  • Plotters are used to produce high-quality drawings
  • Large-format printers create photo-realistic quality color prints

Page 350

Figure 7-37

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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 351

Figure 7-38

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Other Output Devices

  • Many users attach surround sound speakers or speaker systems to their computers, game consoles, and mobile devices to generate higher-quality sounds

Page 351

Figure 7-39

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Other Output Devices

  • Headphones are speakers that cover or are placed outside of the ear
  • Earbuds (also called earphones) rest inside the ear canal

Page 352

Figure 7-40

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Other Output Devices

  • A data projector is a device that projects the text and images displaying on a computer or mobile device screen on a larger screen so that an audience can see the image clearly

Page 352

Figure 7-41

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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

Page 353

Figure 7-42

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Other Output Devices

  • Joysticks, wheels, gamepads, and motion-sensing game controllers can be considered output devices when they include force feedback
    • Technology that sends resistance to the device in response to actions of the user

Page 353

Figure 7-43

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Assistive Technology Input and Output

Braille printer

Page 354

Figures 7-44 – 7-45

Head-mounted pointer

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Summary

Page 355

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Variety of options for input and output

Several assistive technology options for input and output

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Chapter 7 Complete

Chapter 7

​

Input and Output

Discovering Computers 2016

Tools, Apps, Devices, and the Impact of Technology