1. Discovering Computers Chapter 5 Input

2. 2 Ch 4 Processor Control Unit Arithmetic Logic Unit (ALU) Input Devices Ch 5 Storage Devices Ch 7 Output Devices Ch 6 Memory DataInstructions Information Instructions Data Information Control Unit Ch 1 – Introduction Ch 2 – Internet & WWW Ch 3 – Application Software Ch 8 – System Software

3. 3 Software Instructions that tell hardware what tasks to do and how to perform tasks Hardware Electronic and mechanical equipment Input devices are parts of hardware

4. Input 4 Input what? Data  Text  Numbers  Audio  Images  Videos  Bio information  Movements Instructions  Programs  Commands  User responses DATA Bradley Kinkade 42 hours $12.50 per hour hard disk COMMANDS print the timecard PROGRAMS timecard USER RESPONSES Yes, the timecard entries are correct No, the timecard entries are not correct INSTRUCTIONS

5. Input how?

6. Input 6 What are Input Devices? Hardware components used to enter data and instructions into a computer scanners and reading devices voice input keyboard pointing device video input digital camera

7. The Keyboard (text, numbers, instructions) How is the keyboard organized?  Typing area  Numeric keypad  Function keys  Special keys

8. 8 Most desktop computer keyboards have…

9. The insertion point, also known as the cursor, is a symbol on the screen that indicates where the next character you type will appear 9

10. How a keyboard is connected ? USB Keyboard port Wired Keyboard Bluetooth IrDA Wireless Keyboard 10

11. What is a wireless keyboard?  Communicates with a receiver attached to a port on the system unit  Radio waves or infrared waves are used to deliver signals

12. What is a portable keyboard?  A portable keyboard is a full-sized keyboard you attach to and remove from PDA

13. What is a virtual keyboard? A virtual keyboard is a software and/or hardware component that allows a user to enter characters On-screen virtual keyboard

14. 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 14

15. The Keyboard for mobile 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 15

16. Pointing Devices 16

17. Mouse A mouse is a pointing device that fits under the palm of your hand comfortably. Can be wired or wireless 17

18. Right- drag Right- click Double- click Common mouse operations Point Click Drag Rotate wheel

19. What is an optical mouse?  No moving mechanical parts inside  Senses light to detect mouse’s movement  More precise than mechanical mouse  Connects using a cable, or wireless

20. What is a trackball?  Stationary pointing device with a ball on its top or side  To move pointer, rotate ball with thumb, fingers, or palm of your hand

21. Touchpad and a pointing stick  Touchpad is small, flat, rectangular pointing device sensitive to motion  Pointing stick is pointing device shaped like pencil eraser positioned between keys on keyboard sensitive to pressure

22. What is a touch screen?  Touch-sensitive areas of screen  Often used with kiosks

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24. What is a light pen?  Handheld input device that can emits light  Press light pen against screen surface and then press button on pen It allows the user to point to displayed objects, or draw on the screen

25. Digital pen (text, numbers, graphics, instructions)  Looks like a ballpoint pen, but uses pressure to write text and draw lines  Used with tablet PCs

26. 26 Microsoft Surface

27. What is a touch-sensitive pad?  Input device on a portable media player that enables users to scroll through and play music, view pictures, watch videos or movies, adjust volume, and customize settings

28. Other Input for Smart Phones 28

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30. Insertion point: blinking vertical bar that indicates where next character you type will display Mouse pointer: pixel on the screen pointed by the mouse

31. Scanning and Reading What is a scanner?  Light-sensing device that reads printed text and graphics  Used for image processing, converting paper documents into electronic images Drum Pen or Handheld Sheet-fed Flatbed

32. How does a flatbed scanner work? Step 1: Place the document to be scanned face down on the glass window. Using buttons on the scanner or the scanner program, start the scanning process. Step 2: The scanner converts the document content to digital information, which is transmitted through the cable to the memory of the computer. Step 3: Once in the memory of the computer, users can save it as a file, display the image, print it, e-mail it, include it in a document, or place it on a Web page.

33. What is an optical reader?  Optical character recognition (OCR) reads characters in OCR font  Optical mark recognition (OMR) reads hand-drawn pencil marks, such as small circles  Device that uses light source to read characters, marks, and codes and then converts them into digital data

34. What is a turnaround document?  Document that you return to the company that sent it  Portion you return has information printed in OCR characters

35. What is a data collection device?  Obtains data directly at location where transaction or event takes place  Transmits data over network or Internet

36. Data collection devices are used in:  Restaurants  Grocery stores  Factories  Warehouses  The outdoors 36

37. What is a bar code?  Identification code that consists of a set of vertical lines and spaces of different widths  Universal Product Code (UPC)

38. What is a bar code reader?  Uses laser beams to read bar codes

39. What is a magnetic-ink character recognition (MICR) reader?  Can read text printed with magnetized ink  Banking industry uses MICR for check processing

40. Magnetic stripe card reader reads the magnetic stripe on the back of cards such as: 40 Credit cardsEntertainment cardsBank cardsOther similar cards Warning: Exposure to a magnetic field can erase the contents of a card’s magnetic stripe

41. RFID RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an object The tag can be smaller than a grain of sand. They can be read (both the information on the tag and the location of the tag) at a distance by an RFID reader. 41

42. The tag can be implanted into a thing or being with or without persons knowledge. RFID can track: 42 Inventory Location of soldiers Employees Airline baggage Tires Library books Prepaid tolls Patients in the hospitals Children Sex offenders SuspectsPrisoners

43. RFID Reads information on the tag via radio waves Can be handheld devices or mounted in a stationary object

44. Audio Input is the process of entering any sound into the computer 44 SpeechMusicSound Effects

45. How it functions?  Electric waves created by a microphone go to the sound card in the System Unit  Sound card converts them to digital form (analog to digital conversion – ADC)  In the digital form sounds live in the computer  After conversion from digital to analog they come to output devices – speakers

46. Voice Input and Voice Recognition Voice input is the process of entering input by speaking into a microphone Voice recognition is the computer’s capability of distinguishing spoken words 46

47. Music production device and software allows users to record, compose, mix, and edit music and sounds 47

48. Images input Process of entering pictures, figures, symbols into computer Digital cameras, scanners allow us to input images

49. Digital Cameras Allow the user  To take digital pictures  To download images to a computer  To post pictures to the Web  Images are viewable immediately on the camera screen

50. How a digital camera works?

51. Two factors affect the quality (sharpness and clarity) of digital camera photos: 51 Resolution is the number of pixels (intersections of rows and columns) in a display device. Resolution Bit width is the number of bits used to represent a pixel. The more bits representing a pixel the more colors the pixel can carry Number of bits stored in each pixel

52. Video input Process of entering motion images into computer  Video capture card converts analog video signal into digital signal that computer can use  Digital video (DV) camera records video as digital signals

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54. PC video camera and Webcam  PC video camera is used to capture video and still images, and to make video telephone calls on Internet

55. A Webcam is a type of digital video camera that enables a user to: 55 Capture video and still images Send e-mail messages with video attachments Add live images to instant messages Broadcast live images over the Internet Make video telephone calls  Webcam is a video camera whose output displays on a Web page

56. What is video conferencing?  Two or more geographically separated people who use network or Internet to transmit audio and video data

57. Special Input Devices A terminal is a computer that allows users to send data to and/or receive information from a host computer 57 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

58. What is a point of sale (POS) terminal?  Records purchases, processes credit or debit cards, and updates inventory  Swipe credit or debit card through card reader  Reads customer’s personal data from magnetic strip

59. What is an automated teller machine (ATM)?  Self-service banking machine that connects to a host computer through a network

60. Biometric Input  Authenticates person’s identity by verifying personal characteristic  Fingerprint scanner captures curves of fingerprint  Hand geometry system measures shape and size of person’s hand

61. Biometrics authenticates a person’s identity by verifying a personal characteristic 61 Fingerprint reader Face recognition system Hand geometry system Voice verification system Signature verification system Iris recognition system Retinal scanners

62. Examples of biometric technology  Voice verification system compares live speech with stored voice pattern  Signature verification system recognizes shape of signature  Iris recognition system reads patterns in blood vessels in back of eye

63. Game Controllers Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects 63 Gamepads Joysticks and Wheels Light guns Dance pads Motion- sensing controllers

64. Controllers for Gaming and Media Players  Gamepad  Joystick  Wheel  Light gun  Dance pad  Motion-sensing game controller

65. Mercedes Benz SCL600 65

66. No steering wheel, no gas or brake pedals 66

67. Just a joystick (more info here)more info here 67

68. Input devices for those with physical limitations.  Keyguard allows users to rest hands on keyboard without accidentally pressing keys  Head-mounted pointer controls pointer on screen  New developments include gesture recognition and computerized implant devices

69. To see the online addition to the book click here

70. 70 Instructions can be entered into the computer in the form of programs, commands, and user responses A program is a series of instructions that tells a computer how to perform the task User issues commands about when and what tasks (programs) to perform A user response is the users reply to a question displayed by a program