Discovering Computers

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Discovering Computers

• Input

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Input Device

• Hardware that allows users to enter data or
  instructions into a computer
• Keyboards
• Pointing Devices
• Scanners and Reading Devices
• Audio Input Devices
• Picture/Video Input Devices
• Biometric Input Devices

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Keyboard

• Contains keys user press to enter data
• Types of Keys
• Function
• Number Pad
• Arrangement of Keys
• Ergonomics
• QWERTY vs Dvorak
• Wired vs Cordless Keyboards
• Portable Keyboards
• Keyboard Monitoring Software

4
Pointing Devices

• Allow user to control a pointer on the screen
• Mouse
• Trackball
• TouchPad
• Pointing Stick
• Joystick and Wheel
• Stylus and Pen

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Audio Input

• The process of entering any sound into the
  computer such as speech, music, and sound effects
• Microphones
• Tape Players
• CD/DVD players
• Radios
• Electronic Keyboards

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Voice Input

• Example of Audio Input Entering data by speaking
  in a microphone
• Voice Recognition (Speech Recognition)
• Recognize vocabulary of pre-programmed words
• Automated Telephone System at Bank
• Dictate memos into word processing program
• Speaker Dependent
• Train computer by repeating vocabulary
• Speaker Independent
• Built-in set of words

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Input for PDA, Tablet PCs, Smart Phones

• PDAs
• Stylus
• On-screen keyboard
• Handwriting recognition software
• Portable keyboard
• Digital camera
• Tablet PCs
• Digital pen
• Handwriting recognition software
• Docking station
• Smart Phones
• SMS short message service (Text Messages)
• MMS multimedia message service (pictures,
  videos)
• Digital camera

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Video Input

• PC Video Camera
• Add live images to instant messages
• Broadcast live images over the internet
• Make video telephone calls
• Web Cam
• Video camera that displays its output on a Web
  page
• Weather or Traffic information
• Employees at work
• Home Surveillance

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Scanners and Reading Devices

• Light-sensing device that translates printed text
  and graphics into a form the computer understands
• Types
• Flatbed
• Pen or Handheld
• Sheet Fed
• Drum
• Optical Character Recognition
• Converts scanned text documents into a text file
  that can be edited with a word processing program

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Optical Readers

• Optical Characters
• Turnaround documents return to company that
  creates and sends it (phone bill)
• Optical Marks
• Fill-in circles on tests, questionnaires, answer
  sheet
• Bar Code
• Vertical lines and spaces of different widths
• Retail Stores and Supermarkets
• Universal Product Code (UPC)
• United States Postal Service
• POSTNET

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Magnetic Ink Character Recognition

• MICR
• Check Processing
• Bank Routing Number
• Customer Account Number
• Check Number
• Check Amount (added after check is cashed)

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Terminals

• Dumb vs Smart
• Does it have a processor?
• Can it perform independently?
• Special Purpose Terminals (Industry Specific)
• Point of Sale
• Location in a retail or grocery store where
  customers pay for goods.
• ATM (Automated Teller Machines
• Smart Display
• Thin desktop monitor that detaches from the
  computer, wireless touch screen, remotely access
  computer

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Biometric Input

• Translates personal characteristic into digital
  code
• Fingerprint Scanner
• Grade School alternative to lunch money
• Business restrict access to computer
• Law Enforcement
• Face Recognition
• Casino
• Super Bowl Ticket Buyers (known criminals)
• Secure Rooms
• Hand Geometry System
• UGA meal cards
• Voice Recognition
• Iris Recognition

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Input Devices for Physically Challenged

• Voice Recognition
• Keyguard allows users to rest hands on keyboard
• Keyboards with larger keys
• On-screen keyboards
• Trackball attached to wheelchair
• Head-mounted pointer

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Web Resources

• Take Online Quiz over scanners, terminals,
  biometric devices and input for the physically
  challenged users.
• http//scsite.com/dc2005/quiz
• Chapter 5 Objectives 9-12
• View Live Web Cam
• Search Online Web cam Macon Weather
• www.13WMAZ.com
• What are the prices of some biometric devices?