Input devices used for text, graphic, audio and video
Input devices are any hardware components that allow user to enter data and instructions into a computer.
Input Devices For Texts - Keyboard, virtual keyboard (on the screen) & an optical reader (uses a light source to read characters, marks and codes and then converts them into digital data that a computer can process e.g. barcode reader.
Input Devices For Graphics - Scanner is a device that captures images from photographic prints, posters, magazine pages and similar sources for computer editing and display. Digital camera allows you to take pictures and store the photographed images digitally.
Input Devices For Audio - Audio input can be speech, music or sound effects. Audio input devices are such microphone( to record or give command to the computer) and digital musical instruments like the Musical Instrument Digital Interface (MIDI) keyboard ( to play and record music ).
Input Devices For Video - Video input can be from a digital camera, webcam or Closed-Circuit Television (CCTV). CCTV video camera is a type of digital video camera that enables a home or small business user to capture video and still images. A webcam is any video camera that displays its output on a web page. A digital video camera allows you to record full motion and store the captured motion digitally.
Pointing Devices - A pointing device is another form of input device that enables the user to freely move an on-screen pointer to select text, menu options, icons, and other on-screen objects. Pointing devices such as a mouse (has buttons, a rolling ball or an optical reader), trackball ( a stationary device with a ball on top or at the side), joystick ( a vertical lever for control), gamepad (game controller held in both hands with thumbs and fingers to control), graphics tablet and touch screen ( used to input spatial data into the computer. Spatial data refers to data that is continuous and multi-dimensional).
Output devices used for text, graphic, audio and video
Output device is any device that is capable of delivering or showing information to one or more user. An output device shows prints and present the results of a computer’s work e.g. speaker, monitor, LCD projector, Printer, Plotter.
A monitor is an example of an output device that can be used to display text. It can also display graphics and video. It accepts video signals from a computer and displays information on its screen.
A printer is another example of an output device that can be used to print text, apart from graphics, on mediums such as paper, transparency film or even cloths. A photo printer is a colour printer that produces photo-lab-quality pictures.
An image setter produces high quality output compared to an ordinary laser printer. An image setter is a high resolution output device that can transfer electronic text and graphics directly to film, plates, or photo-sensitive paper.
A pair of speakers is an audio output device that generates sound. The headphone is a pair of small speakers placed over the ears and plugged into a port on the sound card. A woofer or subwoofer is used to boost the low bass sound and is connected to the port on the sound card.
A Liquid Crystal Display (LCD) projector uses its own light source to project what is displayed on the computer on a wall or projection screen. A digital light processing (DLP) projector uses tiny mirrors to reflect light which can be seen clearly in a well-lit room.
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