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Input and Output. Describe input Input Devices Keyboard entry, pointing devices, scanning devices Image capture, digitizing, audio-input devices Output Monitors, printers, audio output Combination input and output devices. INPUT. INPUT

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input and output
Input and Output
  • Describe input
  • Input Devices
  • Keyboard entry, pointing devices, scanning devices
  • Image capture, digitizing, audio-input devices
  • Output
  • Monitors, printers, audio output
  • Combination input and output devices

IT Fundamentals

slide2

INPUT

  • INPUT
  • Input is any data or instructions entered into the memory of a computer.
  • Input Devices
  • An input device is any hardware component that allows users to enter data or instructions, programs, commands and user responses into a computer.
  • Translate what language people understand into a form that computer can process
    • keyboard, mouse, stylus, digital pen, microphone, digital camera and scanner, audio input device.

IT Fundamentals

keyboard entry
Keyboard Entry
  • Translate numbers, letters and special characters
  • 3 types of keyboard
    • Traditional keyboard
    • Space-saving folding keyboards
    • Ergonomic keyboard

IT Fundamentals

keyboard entry1
Keyboard Entry
  • Traditional keyboard
  • ESC: escape key, cancel a selection or a procedure
    • Function keys: shortcut for specific tasks
    • Numeric keypad
      • numbers, arithmetic symbols
      • Controls cursor or insertion point
    • Navigation keys
      • Controls cursor or insertion point
    • Windows key: displays the start menu
    • Spacebar: enters blank spaces between characters
    • Caps lock: toggle key
    • Ctrl, shift key: combination keys

IT Fundamentals

pointing devices
Pointing devices
  • The most natural gestures of human
  • Many kinds of pointing devices
    • Mouse
      • Mechanical mouse
        • Left button
        • Right button
        • Roller ball
      • Optical mouse
      • Cordless or wireless mouse
    • Something similar to mouse
      • Trackball(roller ball)
      • Touchpad
      • Pointing stick

IT Fundamentals

pointing devices1
Pointing devices
  • Many kinds of pointing devices
    • Joystick
      • Primary used for games
    • Touch screen
      • Touch-sensitive display device. Users interface with these devices by touching areas of the screen with a finger

IT Fundamentals

pointing devices2
pointing devices
  • Light pen
    • Light-sensitive penlike device
  • Stylus pen
  • digital pen

IT Fundamentals

slide8

Examples of Direct Entry Input Devices(1)

Scanner

  • Also called optical scanner, is a light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can process.
    • Flatbed、Pen、Sheet-fed、Drum

IT Fundamentals

slide9
Barcode Readers
  • A bar code scanner is an optical reader that uses laser beams to read bar codes. It is an identification code that consists of a set of vertical lines and spaces of different widths. The bar code represents data that identifies the manufacturer and the item.

IT Fundamentals

slide10
Character and mark recognition devices
    • Scanners that are able to recognize special characters and marks.
    • 3 types
      • Magnetic-ink character recognition (MICR)
      • Optical-character recognition (OCR)
      • Optical-mark recognition (OMR), mark sensing

IT Fundamentals

slide11
MICR
  • Application of OMR
  • OCR

IT Fundamentals

image capturing devices
Image capturing devices
  • Create or capture original images
  • Digital cameras
    • Images are recorded digitally on a disk or in the cameras memory
    • Take a picture, view it immediately
  • Digital video cameras
    • Record motion digitally
  • Webcams
    • Specialized digital video cameras

IT Fundamentals

digitizing devices
Digitizing devices
  • Convert a sketch or figure into a form that can be processed by a computer
  • Consist of flat surface and a writing device
  • 2 kinds of digitizing devices
    • Graphic tablets
      • Used by artists, mapmakers, engineers
    • Digital notebooks
      • Use a notepad positioned on top of an electronic pad or tablet
      • Electronic pad records the notes taken and drawings created by regular pen

IT Fundamentals

slide14
Graphic tablets
  • Digital notebook

IT Fundamentals

audio input devices
Audio-input devices
  • Convert sounds for processing
    • Microphone
  • Voice recognition systems
    • Use a microphone, sound card, special software
    • 2 types of voice recognition systems
      • Discrete-speech recognition systems
        • Can recognize individual words
        • Cannot distinguish between same-sound words
      • Continuous-speech recognition systems
        • Distinguish between same-sound words by evaluating the context
        • Example:IBM Via Voice

IT Fundamentals

voice recognition system and dictating a paper
Voice recognition system and dictating a paper
  • Preparing
    • Create your personal user profile,which will store your speech patterns
    • Read prearranged standard text to teach the software your unique speech patterns
    • Refine your profile to include specialized vocabulary
  • Using a microphone, dictating the text in word
  • Surfing
    • Start internet explore
    • Go to address www.yahoo.com.
    • Click auctions

IT Fundamentals

slide17

Examples of Direct Entry Input Devices(2)

Data Collection Device

obtains data directly at the location where the transaction or event takes place.

Sensors

  • encode a physical event into data
  • pressure sensor temperature sensor

IT Fundamentals

terminals
Terminals
  • a device that enables you to communicate with a computer. Generally, a terminal is a combination of keyboard and display screen
  • Point-of-Sale Terminals(POS)
  • The POS transaction is captured using a variety of devices which include computers, cash registers, optical and bar code scanners, magnetic card readers, or any combination of these devices.

IT Fundamentals

terminals1
Terminals

IT Fundamentals

terminals2
Terminals
  • Automated Teller Machine (ATM)
  • A computerized telecommunications device that provides the customers of a financial institution with access to financial transactions in a public space without the need for a human clerk or bank teller.
  • On most modern ATMs, the customer is identified by inserting a plastic ATM card with a magnetic stripe or a plastic smartcard with a chip, which contains a unique card number and some security information, such as an expiration date.
  • Security is provided by the customer entering a personal identification number (PIN).

IT Fundamentals

terminals3
Terminals
  • ATM

IT Fundamentals

terminals4
Terminals
  • Smart Displays
  • Smart Display was a Microsoft initiative to use a portable touchscreen LCD monitor as a thin client for PCs, connecting via Wi-Fi(Wireless Fidelity)

IT Fundamentals

biometric input
Biometric Input
  • Biometrics
  • the study of measurable biological characteristics.
  • In computer security, biometrics refers to authentication techniques that rely on measurable physical characteristics that can be automatically checked
  • several types of biometric identification schemes

IT Fundamentals

biometric input1
Biometric Input
  • Biometric devices
  • A biometric device is a device that translates a personal characteristic into a digital code that is compared with a digital code stored in a computer
  • Biometric Flash Disk device

IT Fundamentals

slide25

User Interface(UI)

  • The junction between a user and a computer program.

(1) A command-driven interface

(2) A menu-driven interface:

    • Graphical User Interfaces (GUI)

IT Fundamentals