Discovering Computers: Chapter 05

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Discovering Computers; Your Interactive Guide to the Digital World published by Course Technologies

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Discovering Computers: Chapter 05

  1. 1. Discovering Computers 2012 Your Interactive Guide to the Digital World
  2. 2. Objectives Overview Identify the keys and buttons commonly found on desktop Define input and differentiate computer keyboards, and Describe different mouse typesamong a program, command, and describe how keyboards for and explain how to use a mouse user response mobile computers and devices differ from desktop computer keyboards Describe various types of touch Describe various types of pen Summarize the purpose of variousscreens and explain how a touch- input, and identify other types of game controllers sensitive pad works input for smart phonesSee Page 257 2for Detailed Objectives Discovering Computers 2012: Chapter 5
  3. 3. Objectives Overview Explain how resolution Describe the uses of Discuss how various affects the quality of a voice recognition, Web scanners and reading picture captured on a cams, and video devices work digital camera conferencing Discuss how POS Identify alternative Summarize the various terminals, automated input devices for biometric devices teller machines, and physically challenged DVD kiosks work usersSee Page 257 3for Detailed Objectives Discovering Computers 2012: Chapter 5
  4. 4. What Is Input?• Input is any data and instructions entered into the memory of a computerPages 258 – 259 4 Discovering Computers 2012: Chapter 5Figure 5-1
  5. 5. What Is Input?• Instructions can be entered into the computer in the form of programs, commands, and user responses A program is a series of related instructions that tells a computer what tasks to perform and how to perform them 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 programPages 258 - 259 5 Discovering Computers 2012: Chapter 5
  6. 6. What Are Input Devices An input device is any hardware component that allows users to enter data and instructions into a computerPage 260 6 Discovering Computers 2012: Chapter 5
  7. 7. The Keyboard• A keyboard is an input device that contains keys users press to enter data and instructions into a computerPage 260 7 Discovering Computers 2012: Chapter 5Figure 5-2
  8. 8. The Keyboard• Most desktop computer keyboards have…Pages 260 - 261 8 Discovering Computers 2012: Chapter 5
  9. 9. 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 appearPage 261 9 Discovering Computers 2012: Chapter 5Figure 5-3
  10. 10. The Keyboard Wired Wireless Keyboards Keyboards USB port Bluetooth IrDAPage 262 10 Discovering Computers 2012: Chapter 5
  11. 11. 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 workplacePage 262 11 Discovering Computers 2012: Chapter 5Figure 5-4
  12. 12. 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 keypadPages 262 – 263 12 Discovering Computers 2012: Chapter 5Figure 5-5
  13. 13. Pointing DevicesPage 263 13 Discovering Computers 2012: Chapter 5
  14. 14. 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 wirelessPages 263 – 264 14 Discovering Computers 2012: Chapter 5Figures 5-6 and 5-7
  15. 15. Mouse• Mouse operations Point Click Right-click Double-click Rotate Triple-click Drag Right-drag wheel Free-spin Press thumb Press wheel Tilt wheel wheel buttonPage 264 15 Discovering Computers 2012: Chapter 5Figure 5-8
  16. 16. Other Pointing DevicesTrackball Pointing Stick Touchpad • A trackball is a • A touchpad is a • A pointing stick is a stationary pointing small, flat, rectangular pressure-sensitive device with a ball on pointing device that is pointing device its top or side sensitive to pressure shaped like a pencil and motion eraser that is positioned between keys on a keyboardPages 265 – 266 16Figures 5-9 – 5-11 Discovering Computers 2012: Chapter 5
  17. 17. Touch Screens and Touch-Sensitive Pads• A touch screen is a touch-sensitive display devicePage 266 17Figures 5-12 – 5-13 Discovering Computers 2012: Chapter 5
  18. 18. Touch Screens and Touch-Sensitive Pads Microsoft Surface Touch-sensitive padsPage 267 18 Discovering Computers 2012: Chapter 5Figures 5-14 – 5-15
  19. 19. Pen Input• With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selectionsPage 268 19 Discovering Computers 2012: Chapter 5Figure 5-16
  20. 20. Other Input for Smart PhonesPage 269 20 Discovering Computers 2012: Chapter 5Figures 5-17 – 5-18
  21. 21. Game Controllers• Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects Joysticks and Gamepads Light guns Wheels Motion- Dance pads sensing controllersPages 270 - 271 21 Discovering Computers 2012: Chapter 5
  22. 22. Game ControllersPage 270 22 Discovering Computers 2012: Chapter 5Figure 5-19
  23. 23. Digital Cameras• A digital camera is a mobile device that allows users to take pictures and store them digitally Studio cameras Field cameras Point-and-shoot cameraPage 272 23 Discovering Computers 2012: Chapter 5
  24. 24. Digital CamerasPage 272 24 Discovering Computers 2012: Chapter 5Figure 5-20
  25. 25. Digital Cameras• Two factors affect the quality of digital camera photos: • Resolution is the number of horizontal and vertical pixels in a display device Resolution • A pixel is the smallest element in an electronic display Number of bits • Each pixel consists of one or more bits of data stored in each • The more bits used to represent a pixel, the more colors and shades of gray pixel that can be representedPage 273 25 Discovering Computers 2012: Chapter 5
  26. 26. Voice Input • Voice input is the process of entering input by speaking into a microphone • Voice recognition is the computer’s capability of distinguishing spoken wordsPage 274 26 Discovering Computers 2012: Chapter 5Figure 5-22
  27. 27. Voice Input• Audio input is the process of entering any sound into the computer Speech Music Sound EffectsPage 274 27 Discovering Computers 2012: Chapter 5
  28. 28. Voice Input• Music production software allows users to record, compose, mix, and edit music and soundsPage 274 28 Discovering Computers 2012: Chapter 5Figure 5-23
  29. 29. Video Input• Video input is the process of capturing full-motion images and storing them on a computer’s storage medium 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 imagesPage 275 29 Discovering Computers 2012: Chapter 5
  30. 30. Video InputPage 275 30 Discovering Computers 2012: Chapter 5Figure 5-24
  31. 31. Video Input• A Web cam is a type of digital video camera that enables a user to: Send e-mail Capture video and Add live images to messages with still images instant messages video attachments Broadcast live Make video images over the telephone calls InternetPages 275 - 276 31 Discovering Computers 2012: Chapter 5
  32. 32. Video Input• A video conference is a meeting between two or more geographically separated peoplePages 276 – 277 32 Discovering Computers 2012: Chapter 5Figures 5-25 – 5-26
  33. 33. Scanners and Reading Devices Flatbed Pen or Handheld Sheet-fed DrumPage 277 33 Discovering Computers 2012: Chapter 5Figure 5-27
  34. 34. Scanners and Reading DevicesPage 278 34 Discovering Computers 2012: Chapter 5Figure 5-28
  35. 35. Scanners and Reading Devices• 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 itPage 279 35 Discovering Computers 2012: Chapter 5Figures 5-29 – 5-30
  36. 36. Scanners and Reading Devices • Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles • An OMR device scans the documents and matches the patterns of lightPage 279 36 Discovering Computers 2012: Chapter 5Figure 5-31
  37. 37. Scanners and Reading Devices • A bar code reader, also called a bar code scanner uses laser beams to read bar codesPage 280 37 Discovering Computers 2012: Chapter 5Figure 5-32
  38. 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 reader reads information on the tag via radio waves• RFID can track:Tracking times of Tracking location Employee Checking lift runners in a Airline baggage of soldiers wardrobes tickets of skiers marathon Gauging pressure Managing Checking out Tracking toll and temperature inventory library books payments of tiresPage 280 38 Discovering Computers 2012: Chapter 5
  39. 39. Scanners and Reading Devices• Magnetic stripe card readers read the magnetic stripe on the back of cards such as: Credit cards Entertainment cards Bank cards Other similar cardsPage 281 39 Discovering Computers 2012: Chapter 5Figure 5-34
  40. 40. 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 processingPage 281 40 Discovering Computers 2012: Chapter 5Figure 5-35
  41. 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 outdoorsPage 282 41 Discovering Computers 2012: Chapter 5Figure 5-36
  42. 42. Biometric Input• Biometrics authenticates a person’s identity by verifying a personal characteristic Face Hand Fingerprint recognition geometry reader system system Voice Signature Iris recognition verification verification system system system Retinal scannersPages 282 - 283 42 Discovering Computers 2012: Chapter 5
  43. 43. Biometric Input hand geometry system iris recognition system fingerprint readerPages 282 – 283 43Figures 5-37 – 5-39 Discovering Computers 2012: Chapter 5
  44. 44. Terminals• A terminal is a computer that allows users to send data to and/or receive information from a host computer A POS terminal An automated teller A DVD kiosk is a self- records machine (ATM) service DVD rental purchases, processes allows users to access machine payment, and their bank accounts updates inventoryPages 284 – 285 44Figures 5-40 – 5-42 Discovering Computers 2012: Chapter 5
  45. 45. Putting It All TogetherPage 285 45 Discovering Computers 2012: Chapter 5Figure 5-43
  46. 46. Putting It All TogetherPage 285 46 Discovering Computers 2012: Chapter 5Figure 5-43
  47. 47. Putting It All TogetherPage 285 47 Discovering Computers 2012: Chapter 5Figure 5-43
  48. 48. Input Devices for Physically Challenged Users• Several input devices are available to assist physically challenged users: Keyboards Various On-screen Keyguard with larger pointing keyboard keys devices Head- Computerized Gesture mounted implant recognition pointer devicesPage 286 48 Discovering Computers 2012: Chapter 5
  49. 49. Input Devices for Physically Challenged Users Keyboard with larger keys Head-mounted pointerPage 286 49 Discovering Computers 2012: Chapter 5Figures 5-44 – 5-45
  50. 50. Summary Various techniques of entering input Several commonly used input devices Keyboard, mouse, and other pointing devices; touch screens, pen input, other input for smart Input devices for physically challenged phones, game controllers, digital users cameras, voice input, video input, scanners and reading devices, biometric input, and terminalsPage 287 50 Discovering Computers 2012: Chapter 5
  51. 51. Discovering Computers 2012 Your Interactive Guide to the Digital World Chapter 5 Complete

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