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Chapter 2:

Chapter 2:. Table Of Contents (TOC):- Understanding Input Understanding Output Understanding System Unit Components Understanding Memory Unit Understanding Storage. Learning Objectives (LO). Explain various computer I/O devices, central processing unit (CPU), memory unit and storage

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Chapter 2:

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  1. Chapter 2: • Table Of Contents (TOC):- • Understanding Input • Understanding Output • Understanding System Unit Components • Understanding Memory Unit • Understanding Storage Discovering Computers 2012: Chapter 2-5

  2. Learning Objectives (LO) • Explain various computer I/O devices, central processing unit (CPU), memory unit and storage • Computer hardware usage Discovering Computers 2012: Chapter 5

  3. Understanding Input Devices Discovering Computers 2012: Chapter 5

  4. Objectives Overview Discovering Computers 2012: Chapter 5 See Page 257 for Detailed Objectives

  5. Objectives Overview Discovering Computers 2012: Chapter 5 See Page 257 for Detailed Objectives

  6. What Is Input? • Input is any data and instructions entered into the memory of a computer Discovering Computers 2012: Chapter 5 Pages 258 – 259 Figure 5-1

  7. What Is Input? • Instructions can be entered into the computer in the form of programs, commands, and user responses Discovering Computers 2012: Chapter 5 Pages 258 - 259

  8. What Are Input Devices Discovering Computers 2012: Chapter 5 Page 260

  9. The Keyboard • A keyboard is an input device that contains keys users press to enter data and instructions into a computer Discovering Computers 2012: Chapter 5 Page 260 Figure 5-2

  10. The Keyboard • Most desktop computer keyboards have… Discovering Computers 2012: Chapter 5 Pages 260 - 261

  11. The Keyboard Discovering Computers 2012: Chapter 5 Page 262

  12. The Keyboard • 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 2012: Chapter 5 Page 262 Figure 5-4

  13. 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 phone’s keypad Discovering Computers 2012: Chapter 5 Pages 262 – 263 Figure 5-5

  14. Pointing Devices Discovering Computers 2012: Chapter 5 Page 263

  15. Mouse • 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 Discovering Computers 2012: Chapter 5 Pages 263 – 264 Figures 5-6 and 5-7

  16. Mouse • Mouse operations Discovering Computers 2012: Chapter 5 Page 264 Figure 5-8

  17. Other Pointing Devices Discovering Computers 2012: Chapter 5 Pages 265 – 266 Figures 5-9 – 5-11

  18. Touch Screens and Touch-Sensitive Pads • A touch screenis a touch-sensitive display device Discovering Computers 2012: Chapter 5 Page 266 Figures 5-12 – 5-13

  19. Touch Screens and Touch-Sensitive Pads Microsoft Surface Touch-sensitive pads Page 267 Figures 5-14 – 5-15 Discovering Computers 2012: Chapter 5

  20. Pen Input • With pen input, you touch a stylusor digital pen on a flat surface to write, draw, or make selections Discovering Computers 2012: Chapter 5 Page 268 Figure 5-16

  21. Other Input for Smart Phones Discovering Computers 2012: Chapter 5 Page 269 Figures 5-17 – 5-18

  22. Game Controllers • Video games and computer games use a game controlleras the input device that directs movements and actions of on-screen objects Discovering Computers 2012: Chapter 5 Pages 270 - 271

  23. Game Controllers Discovering Computers 2012: Chapter 5 Page 270 Figure 5-19

  24. Digital Cameras • A digital camerais a mobile device that allows users to take pictures and store them digitally Discovering Computers 2012: Chapter 5 Page 272

  25. Digital Cameras • Two factors affect the quality of digital camera photos: Discovering Computers 2012: Chapter 5 Page 273

  26. Voice Input • Voice inputis the process of entering input by speaking into a microphone • Voice recognitionis the computer’s capability of distinguishing spoken words Page 274 Figure 5-22 Discovering Computers 2012: Chapter 5

  27. Voice Input • Audio inputis the process of entering any sound into the computer Discovering Computers 2012: Chapter 5 Page 274

  28. Voice Input • Music production software allows users to record, compose, mix, and edit music and sounds Discovering Computers 2012: Chapter 5 Page 274 Figure 5-23

  29. Video Input • Video inputis the process of capturing full-motion images and storing them on a computer’s storage medium Discovering Computers 2012: Chapter 5 Page 275

  30. Video Input Discovering Computers 2012: Chapter 5 Page 275 Figure 5-24

  31. Video: Video Editing on Your Computer CLICK TO START Discovering Computers 2012: Chapter 5

  32. Video Input • A Web camis a type of digital video camera that enables a user to: Discovering Computers 2012: Chapter 5 Pages 275 - 276

  33. Video Input • A video conferenceis a meeting between two or more geographically separated people Discovering Computers 2012: Chapter 5 Pages 276 – 277 Figures 5-25 – 5-26

  34. Scanners and Reading Devices Discovering Computers 2012: Chapter 5 Page 277 Figure 5-27

  35. Scanners and Reading Devices • 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 Discovering Computers 2012: Chapter 5 Page 279 Figures 5-29 – 5-30

  36. Scanners and Reading Devices • Optical character recognition (OCR)involves reading characters from ordinary documents • Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles • A bar code reader, also called a bar code scanner uses laser beams to read bar codes Discovering Computers 2012: Chapter 5 Page 279 Figures 5-29 – 5-30

  37. Scanners and Reading Devices Scanners and Reading Devices Page 280 Figure 5-32 Discovering Computers 2012: Chapter 5

  38. 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 readerreads information on the tag via radio waves • RFID can track: Discovering Computers 2012: Chapter 5 Page 280

  39. Scanners and Reading Devices • Magnetic stripe card readersread the magnetic stripe on the back of cards such as: Discovering Computers 2012: Chapter 5 Page 281 Figure 5-34

  40. Scanners and Reading Devices • 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 Discovering Computers 2012: Chapter 5 Page 281 Figure 5-35

  41. Scanners and Reading Devices • Data collection devices obtain data directly at the location where the transaction or event takes place • Used in: • Restaurants • Grocery stores • Factories • Warehouses • The outdoors Page 282 Figure 5-36 Discovering Computers 2012: Chapter 5

  42. Biometric Input • Biometrics authenticates a person’s identity by verifying a personal characteristic Discovering Computers 2012: Chapter 5 Pages 282 - 283

  43. Biometric Input hand geometry system iris recognition system fingerprint reader Discovering Computers 2012: Chapter 5 Pages 282 – 283 Figures 5-37 – 5-39

  44. Terminals • A terminal is a computer that allows users to send data to and/or receive information from a host computer Discovering Computers 2012: Chapter 5 Pages 284 – 285 Figures 5-40 – 5-42

  45. Input Devices for Physically Challenged Users • Several input devices are available to assist physically challenged users: Discovering Computers 2012: Chapter 5 Page 286

  46. Input Devices for Physically Challenged Users Keyboard with larger keys Head-mounted pointer Page 286 Figures 5-44 – 5-45 Discovering Computers 2012: Chapter 5

  47. Summary Discovering Computers 2012: Chapter 5 Page 287

  48. Chapter 5 Complete

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