Computer input output devices

INPUT DEVICES

An input device is an electromechanical device that accepts data from outside world and translates them into a from a computer can interpret.It is a piece of equipment used to provide data and control signals to an information processing system.

Categories

Keyboard devices

Example:
    1. Qwerty keyboard
    2. Gaming keyboard
    3. Virtual keyboard
    4. and multimedia keyboard.

Point-and-draw devices

It is an input system that helps to point and select an icon to be shown on the screen quickly.
 
Example-
  1. MouseTypes
    Mechanical and optical mouse; one,two and three buttons mouse;serial and bus mouse;wired and cordless mouse.
  2. Trackball
  3. Joystick
  4. Electronic pen types
    1. Light pen
    2. and writing pen with pad.

Touch Screen

  1. Data scanning devices
    Data scanning devices are input devices, which are used for direct data entry into the computer system from source documents.
  2. Types-Image scanner(Flatbed scanner and Hand-held scanner)
  3. Optical character Recognition(OCR) Device
  4. Optical Mark Reader(OMR)
  5. Bar-code Reader
  6. Magnetic-Ink Character Recognition(MICR).
 

Digitizer

A digitizer is a machine that converts an analog object,image or signal into a digital(computer-readable) format.
 

Electronic-card Reader

Modern card readers are electronic devices that can read plastic cards embedded with either a barcode, magnetic strip, computer chip or another storage medium.
Advantages:
  1. Money saver
  2. Time saver and customization.
 

Speech recognition devices

Speech recognition, the ability of devices to respond to spoken commands.
Example:
  1. Alexa
  2. and google assistant.
 

Vision based devices

Computer vision is a field of artificial intelligence that trains computers to interpret and understand the visual world using digital images from cameras and videos and deep learning models. 
 

OUTPUT DEVICES

An output device is an electromechanical device that accepts data from a computer and translates them into a form suitable for use by outside world(users). 

Categories:-

Monitors

It is an output device that displays information in pictorial or text form.Two basic types of monitors are cathode-ray-tube(CRT) and Liquid Crystal Display(LCD) flat-panel.

Printers

A printer is a device that accepts text and graphic output from a computer and transfers the information to paper.

Types:
  1. Dot-Matrix Printers
    A printer that uses hammers and a ribbon to form images from dots. 
  2. Inkjet Printers
    It is a computer peripheral that produces hard copy by spraying ink into paper.
  3. Drum Printers
    A line printer that uses a rotating drum with raised characters, against which the paper is pressed. Drum printers are line printers that print an entire line at a time.  
  4. Chain/Band Printers
    An early line printer that used type slugs linked together in a chain as its printing mechanism. Chain/Band printers are line printers that print one line at a time.
  5. Laser Printers
    It is a popular type of personal computer printer that uses a non-impact,photocopier technology.
 

Plotters

A plotter is a printer that interprets commands from a computer to make line drawing on paper with one or more automated pens.It is used to print graphical output on paper.

Types:
  1. Drum Plotter
    A type of pen plotter that wraps the paper around a drum with a pin feed attachment.
  2. Flatbed Plotter
    A graphics plotter that contains a flat surface that the paper is placed on.
 

Screen image projector

A projector or image projector is an optical device that projects an image onto a surface, commonly a projection screen.
The five projectors are
  1. DLP
  2. LCD
  3. LED
  4. LCOS
  5. and laser.

Voice response system

It is a specialized technologies designed for providing callers with verbal and faxed answers to inquiries without assistance from a person.
 
Types:
  1. Voice Reproduction System
    A voice reproduction system produces audio output by selecting an audio output from a set of pre-recorded audio responses.
  2. Speech Synthesizer
    A speech synthesizer converts text information into spoken sentences, To produce speech, it combines basic sound units called phonemes.
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