1. Discovering Computers Fundamentals, 2012 Edition Chapter Five: Input

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 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 3 See Page 187 for Detailed Objectives

4. What Is Input? Input is any data and instructions entered into the memory of a computer 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 5 Page 188

6. Keyboard and Pointing Devices A keyboard is an input device that contains keys users press to enter data and instructions into a computer 6 Page 190 Figure 5-2

7. 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 7 Page 191 Figure 5-3

8. 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 8 Page 192 Figures 5-5 – 5-7

9. Touch Screens and Touch-Sensitive Pads A touch screen is a touch-sensitive display device 9 Page 193 Figure 5-8

10. Touch Screens and Touch-Sensitive Pads Microsoft SurfaceTouch-sensitive pads 10 Page 193 Figures 5-9 – 5-10

11. Pen Input With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections 11 Page 194 Figure 5-11

12. Other Types of Input 12 Page 195 Figure 5-12

13. Other Types of Input 13 Page 196 Figure 5-13

14. Other Types of Input 14 Page 197 Figure 5-14

15. Other Types of Input Two factors affect the quality of digital camera photos: 15 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

16. Other Types of 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 Audio input is the process of entering any sound into the computer 16 Page 198

17. Other Types of Input A video conference is a meeting between two or more geographically separated people 17 Page 199 Figures 5-16 – 5-17

18. Other Types of Input 18 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

19. 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 19 Page 200 Figure 5-19

20. Other Types of Input Optical mark recognition ( OMR ) reads hand-drawn marks such as small circles or rectangles 20 Page 200

21. Other Types of Input A bar code reader, also called a bar code scanner uses laser beams to read bar codes 21 Page 201 Figure 5-20

22. 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: 22 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

23. Other Types of Input Magnetic stripe card readers read the magnetic stripe on the back of cards such as: 23 Pages 201 Figure 5-22 Credit cardsEntertainment cardsBank cardsOther similar cards

24. 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 24 Page 202 Figure 5-23

25. Other Types of Input Biometrics authenticates a person’s identity by verifying a personal characteristic 25 Pages 202 - 203 Fingerprint reader Face recognition system Hand geometry system Voice verification system Signature verification system Iris recognition system Retinal scanners

26. Other Types of Input 26 Pages 202 – 203 Figures 5-24 – 5-25 fingerprint reader iris recognition system

27. Other Types of Input A terminal is a computer that allows users to send data to and/or receive information from a host computer 27 Pages 204 – 205 Figures 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

28. What Is Output? Output is data that has been processed into a useful form 28 Pages 206 – 207 Figure 5-29

29. Display Devices A display device visually conveys text, graphics, and video information A monitor is packaged as a separate peripheral – LCD monitor – Widescreen 29 Pages 207 – 208 Figure 5-30

30. Display Devices Liquid crystal display ( LCD ) uses a liquid compound to present information on a display device 30 Page 209 ResolutionResponse timeBrightnessDot pitchContrast ratio

31. Display Devices Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches 31 Page 210 Figure 5-32

32. Display Devices A CRT monitor is a desktop monitor that contains a cathode-ray tube 32 Page 210 Figure 5-33

33. Printers A printer produces text and graphics on a physical medium Before purchasing a printer, ask yourself a series of questions 33 Page 211 Figure 5-34

34. Printers A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper 34 Page 213 Ink-jet printers Photo printers Laser printers Thermal printers Mobile printers Plotters Large- format printers

35. 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 35 Page 213 Figure 5-36

36. 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 36 Page 214

37. Printers Laser printer High- speed High- quality Color Black- and- white 37 Pages 214 – 215 Figure 5-38

38. 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 38 Page 215 Figure 5-39

39. Printers A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper 39 Pages 215 – 216 Figure 5-40 Dye- sublimation printer

40. Printers Plotters are used to produce high-quality drawings Large-format printers create photo- realistic quality color prints on a larger scale 40 Page 216 Figure 5-42

41. 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 41 Page 217 Dot-matrix printer Line printer

42. 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 42 Page 217 Figure 5-43

43. Other Output Devices An audio output device produces music, speech, or other sounds 43 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

44. Other Output Devices Headphones are speakers that cover or are placed outside of the ear Earbuds (also called earphones) rest inside the ear canal 44 Page 218

45. 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 45 Page 218

46. 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 46 Page 218 Figure 5-45

47. 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 47 Page 218 Figure 5-46

48. Input and Output Devices for Physically Challenged Users Braille printer 48 Pages 220 – 221 Figures 5-48 – 5-49 Head-mounted pointer