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Discovering Computers Fundamentals, 2012 Edition Your Interactive Guide to the Digital World.

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Presentation on theme: "Discovering Computers Fundamentals, 2012 Edition Your Interactive Guide to the Digital World."— Presentation transcript:

1 Discovering Computers Fundamentals, 2012 Edition Your Interactive Guide to the Digital World

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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 2 See Page 187 for Detailed Objectives

3 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 3 See Page 187 for Detailed Objectives

4 What Is Input? Input is any data and instructions entered into the memory of a computer Discovering Computers Fundamentals, 2012 Edition Chapter 5 4 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 5 Page 188

6 Keyboard and Pointing Devices Discovering Computers Fundamentals, 2012 Edition Chapter 5 6 Page 189

7 Keyboard and Pointing Devices A keyboard is an input device that contains keys users press to enter data and instructions into a computer Discovering Computers Fundamentals, 2012 Edition Chapter 5 7 Page 190 Figure 5-2

8 Keyboard and Pointing Devices Discovering Computers Fundamentals, 2012 Edition Chapter 5 8 Page 190 Most desktop computer keyboards have…

9 Keyboard and Pointing Devices 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 Fundamentals, 2012 Edition Chapter 5 9 Page 190

10 Keyboard and Pointing Devices 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 Fundamentals, 2012 Edition Chapter 5 10 Page 191 Figure 5-3

11 Keyboard and Pointing Devices A mouse is a pointing device that fits under the palm of your hand comfortably – Most widely used pointing device on desktop computers today A mouse can be wired or wireless An optical mouse emits and senses light to detect mouse movement Discovering Computers Fundamentals, 2012 Edition Chapter 5 11 Pages 191 – 192 Figure 5-4

12 Keyboard and Pointing Devices Trackball 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 Pointing Stick A pointing stick is a pressure- sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard Discovering Computers Fundamentals, 2012 Edition Chapter 5 12 Page 192 Figures 5-5 – 5-7

13 Touch Screens and Touch-Sensitive Pads A touch screen is a touch-sensitive display device Discovering Computers Fundamentals, 2012 Edition Chapter 5 13 Page 193 Figure 5-8

14 Touch Screens and Touch-Sensitive Pads Microsoft SurfaceTouch-sensitive pads Discovering Computers Fundamentals, 2012 Edition Chapter 5 14 Page 193 Figures 5-9 – 5-10

15 Pen Input With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections Stylus is the primary input device for PDAs Discovering Computers Fundamentals, 2012 Edition Chapter 5 15 Page 194 Figure 5-11

16 Other Types of Input Discovering Computers Fundamentals, 2012 Edition Chapter 5 16 Page 195 Figure 5-12

17 Other Types of Input Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects Discovering Computers Fundamentals, 2012 Edition Chapter 5 17 Pages Gamepads Joysticks and Wheels Light gunsDance pads Motion- sensing controllers Wii Remote

18 Other Types of Input Discovering Computers Fundamentals, 2012 Edition Chapter 5 18 Page 196 Figure 5-13

19 Other Types of Input A digital camera is a mobile device that allows users to take pictures and store them digitally Discovering Computers Fundamentals, 2012 Edition Chapter 5 19 Page 197 Studio camerasField camerasPoint-and-shoot cameras

20 Other Types of Input Discovering Computers Fundamentals, 2012 Edition Chapter 5 20 Page 197 Figure 5-14

21 Other Types of Input Two factors affect the quality of digital camera photos: Discovering Computers Fundamentals, 2012 Edition Chapter 5 21 Page 198 Resolution is the number of horizontal and vertical pixels in a display device A pixel is the smallest element in an electronic display Resolution

22 Other Types of Input Voice input is the process of entering input by speaking into a microphone – Your voice is the traditional input method for smart phones. Voice recognition is the computer’s capability of distinguishing spoken words. – Current voice recognition programs can recognize millions of words. Audio input is the process of entering any sound into the computer Discovering Computers Fundamentals, 2012 Edition Chapter 5 22 Page 198

23 Other Types of Input Music production software allows users to record, compose, mix, and edit music and sounds. Users input music and other sound effects using external MIDI devices like an electronic piano keyboard. Discovering Computers Fundamentals, 2012 Edition Chapter 5 23 Page 198 Figure 5-15

24 Other Types of Input Video input is the process of capturing full-motion images and storing them on a computer’s storage medium Discovering Computers Fundamentals, 2012 Edition Chapter 5 24 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 unitTransfer video and images

25 Video: Video Editing on Your Computer Discovering Computers Fundamentals, 2012 Edition Chapter 5 25 CLICK TO START

26 Other Types of Input A Web cam is a type of digital video camera that enables a user to: Discovering Computers Fundamentals, 2012 Edition Chapter 5 26 Page 199 Capture video and still images Send messages with video attachments Add live images to instant messages Broadcast live images over the Internet Make video telephone calls

27 Other Types of Input A video conference is a meeting between two or more geographically separated people To participate in a video conference, users need video conferencing software, microphones, speakers, and a web cam. Discovering Computers Fundamentals, 2012 Edition Chapter 5 27 Page 199 Figures 5-16 – 5-17

28 Other Types of Input Discovering Computers Fundamentals, 2012 Edition Chapter 5 28 Page 200 Figure 5-18 A flatbed scanner creates a file of the document in memory – Works in a manner similar to a copy machine

29 Other Types of Input 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 29 Page 200 Figure 5-19

30 Other Types of Input Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles Discovering Computers Fundamentals, 2012 Edition Chapter 5 30 Page 200

31 Other Types of Input A bar code reader, also called a bar code scanner uses laser beams to read bar codes Discovering Computers Fundamentals, 2012 Edition Chapter 5 31 Page 201 Figure 5-20

32 Other Types of Input 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 Fundamentals, 2012 Edition Chapter 5 32 Page 201 Times of runners in a marathon Location of soldiers Employee wardrobes Airline baggage Lift tickets of skiers Inventory Pressure and temperature of tires Checked out library books Toll payments

33 Other Types of Input Magnetic stripe card readers read the magnetic stripe on the back of cards such as: Discovering Computers Fundamentals, 2012 Edition Chapter 5 33 Pages 201 Figure 5-22 Credit cardsEntertainment cardsBank cardsOther similar cards

34 Other Types of Input 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 Fundamentals, 2012 Edition Chapter 5 34 Page 202 Figure 5-23

35 Other Types of Input Biometrics authenticates a person’s identity by verifying a personal characteristic Discovering Computers Fundamentals, 2012 Edition Chapter 5 35 Pages Fingerprint reader Face recognition system Hand geometry system Voice verification system Signature verification system Iris recognition system Retinal scanners

36 Other Types of Input Discovering Computers Fundamentals, 2012 Edition Chapter 5 36 Pages 202 – 203 Figures 5-24 – 5-25 fingerprint reader iris recognition system Fingerprint scanners are the most widely used biometric device today.

37 Other Types of Input A terminal is a computer that allows users to send data to and/or receive information from a host computer Discovering Computers Fundamentals, 2012 Edition Chapter 5 37 Pages 204 – 205 Figures 5-26 – 5-28 A POS terminal records purchases, processes payment, and updates inventory – used in grocery stores and most retail stores An automated teller machine (ATM) allows users to access their bank accounts A DVD kiosk is a self- service DVD rental machine

38 What Is Output? Output is data that has been processed into a useful form Discovering Computers Fundamentals, 2012 Edition Chapter 5 38 Pages 206 – 207 Figure 5-29

39 What Is Output? An output device is any type of hardware component that conveys information to one or more people Discovering Computers Fundamentals, 2012 Edition Chapter 5 39 Page 206 Display devices Printers Speakers, headphones, and earbuds Data projectors Interactive whiteboards

40 Display Devices A display device visually conveys text, graphics, and video information A monitor is packaged as a separate peripheral – LCD monitor – Widescreen Discovering Computers Fundamentals, 2012 Edition Chapter 5 40 Pages 207 – 208 Figure 5-30

41 Display Devices Liquid crystal display (LCD) uses a liquid compound to present information on a display device Discovering Computers Fundamentals, 2012 Edition Chapter 5 41 Page 209 ResolutionResponse timeBrightnessDot pitchContrast ratio

42 Display Devices Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches Discovering Computers Fundamentals, 2012 Edition Chapter 5 42 Page 210 Figure 5-32

43 Video: SID: Size Matters Discovering Computers Fundamentals, 2012 Edition Chapter 5 43 CLICK TO START

44 Display Devices A CRT monitor is a desktop monitor that contains a cathode-ray tube Pixel (picture-element) smallest element in an electronic image. Discovering Computers Fundamentals, 2012 Edition Chapter 5 44 Page 210 Figure 5-33

45 Printers A printer produces text and graphics on a physical medium Before purchasing a printer, ask yourself a series of questions Discovering Computers Fundamentals, 2012 Edition Chapter 5 45 Page 211 Figure 5-34

46 Printers Discovering Computers Fundamentals, 2012 Edition Chapter 5 46 Page 212 Figure 5-35

47 Printers A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper Discovering Computers Fundamentals, 2012 Edition Chapter 5 47 Page 213 Ink-jet printers Photo printers Laser printers Thermal printers Mobile printers Plotters Large- format printers

48 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 48 Page 213 Figure 5-36

49 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 screen Discovering Computers Fundamentals, 2012 Edition Chapter 5 49 Page 214

50 Printers Discovering Computers Fundamentals, 2012 Edition Chapter 5 50 Page 214 Figure 5-37

51 Printers Laser printer High- speed High- quality Color Black- and- white Discovering Computers Fundamentals, 2012 Edition Chapter 5 51 Pages 214 – 215 Figure 5-38

52 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 52 Page 215 Figure 5-39

53 Printers A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper Discovering Computers Fundamentals, 2012 Edition Chapter 5 53 Pages 215 – 216 Figure 5-40 Dye- sublimation printer

54 Printers A mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a mobile device Discovering Computers Fundamentals, 2012 Edition Chapter 5 54 Page 216 Figure 5-41

55 Printers Plotters are used to produce high-quality drawings Large-format printers create photo-realistic quality color prints on a larger scale Discovering Computers Fundamentals, 2012 Edition Chapter 5 55 Page 216 Figure 5-42

56 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 56 Page 217 Dot-matrix printer Line printer

57 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 57 Page 217 Figure 5-43

58 Other Output Devices An audio output device produces music, speech, or other sounds Discovering Computers Fundamentals, 2012 Edition Chapter 5 58 Page 217 Figure 5-44 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

59 Other Output Devices Headphones are speakers that cover or are placed outside of the ear Earbuds (also called earphones) rest inside the ear canal Discovering Computers Fundamentals, 2012 Edition Chapter 5 59 Page 218

60 Other Output Devices 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 60 Page 218

61 Other Output Devices A data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen Discovering Computers Fundamentals, 2012 Edition Chapter 5 61 Page 218 Figure 5-45

62 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 Discovering Computers Fundamentals, 2012 Edition Chapter 5 62 Page 218 Figure 5-46

63 Putting It All Together Discovering Computers Fundamentals, 2012 Edition Chapter 5 63 Page 219 Figure 5-47

64 Putting It All Together Discovering Computers Fundamentals, 2012 Edition Chapter 5 64 Page 219 Figure 5-47

65 Putting It All Together Discovering Computers Fundamentals, 2012 Edition Chapter 5 65 Page 219 Figure 5-47

66 Input and Output Devices for Physically Challenged Users Braille printer Discovering Computers Fundamentals, 2012 Edition Chapter 5 66 Pages 220 – 221 Figures 5-48 – 5-49 Head-mounted pointer

67 Summary Various techniques for entering input and several commonly used input devices Various methods of output and several commonly used output devices Discovering Computers Fundamentals, 2012 Edition Chapter 5 67 Page 222

68 Discovering Computers Fundamentals, 2012 Edition Your Interactive Guide to the Digital World Chapter 5 Complete


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