2.4 Input and Output Devices

2.4 Input and Output Devices

1. INPUT DEVICES

   • Keyboard
     • Input device that contains key users press to enter data and instructions into a computer.
     • Types of keyboard: *Standard keyboard *Compact keyboard *Ergonomic keyboard *Gaming keyboard
     • Compact Keyboard
       • smaller than a standard keyboard
       • does not include the numeric keypad or navigation keys
     • Gaming Keyboard
       • designed specifically for users who enjoy playing games
       • can customize the keyboard to the game being played
   • Pointing Devices
     • Examples of pointing devices: * Mouse *Trackball *Touchpad
     • Optical Mouse
       • emits and sense light to detect the mouse‘s movement
     • Laser mouse
     • Track ball
       • stationary pointing device with a ball on its top or side
     • Pointing Stick
       • pressure-sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard
   • Touch screen
     • touch-sensitive display device.
     • can interact with touch screens by touching area of the screens.
   • Scanners and Reading devices
     • reads printed text and graphics and then translates the result into a form the computer can process.
     • Optical Readers
       • uses a light source to read characters, marks and codes and then converts them into digital data that a computer can process.
       • Optical Character Recognition (OCR)
         • Passport reader, AES Camera
       • Optical Mark Recognition (OMR)
       • Bar Code Readers
         • read bar codes by using lights patterns that pass through the bar code lines.
       • RFID readers
         • uses radio signals to communicate with a tag placed in or attached to an object
   • Pen input
     • you touch a stylus or digital pen on a flat surface to write, draw, or make selections.
     • Examples of pen input: *Stylus *Digital pen *Signature capture pad
   • Voice / Audio Input
     • entering any sound into the computer such as speech, music and sound effects.
   • Video Input
     • capturing full-motion images and storing them on a computer’s storage medium by using a digital signals
   • Biometric Input
     • Fingerprint reader
     • Face recognition system
       • Captures a live face image and compares
     • Hand geometry system
     • Iris recognition system
       • High security areas use iris recognition system. The camera in an iris recognition system

2. OUTPUT DEVICES

   • any hardware component that conveys information to one or more
   • Display Devices
     • that visually conveys text, graphics and video information.
     • CRT Monitor
       • desktop monitor that contains a cathode-ray tube (CRT).
     • LCD Monitors
     • Plasma Monitors
       • uses gas plasma technology.
   • Printers
     • Impact Printers
       • characters and graphics on a piece of paper by striking a mechanism
     • Nonimpact Printers
       • Ink-Jet Printers
         • printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper.
       • Thermal Printers
         • use of heat in order to produce the image on paper
       • Photo Printers
         • produces color photo-lab-quality pictures
   • Speaker
     • speakers is to produce audio output that can be heard by the listener
   • Headphones and Earbuds
     • usually include noise-cancelling technology to reduce the interference of sounds from the surrounding environment.
   • Data Projectors
     • that takes the text, videos and images displaying on a computer screen and projects them on a larger screen
   • Interactive Whiteboards
     • touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen,

3. Assistive Technology

   • system that is used to increase, maintain, or improve the functional capabilities of persons with disabilities.
   • Braille is a writing system for blind and visually impaired people
     • Braille keyboard
     • Braille printer
   • Head-mounted pointer
     • Control the pointer or insertion point for user with limited hand movement
   • On-screen Keyboard
     • application displaying a unique virtual keyboard on the screen and allowing you to use the mouse pointer
   • Voice recognition
     • enables the recognition and translation of spoken language into text or speech by computers.