英文版电脑配置介绍课件.pptxVIP

INPUT DEVICES AND OUTPUT DEVICES Jill.zeng Speaker - Output device - The presiding officer in a legislative assembly, esp. the House of Representatives Scanner - A device for examining, reading, or monitoring something, in particular - Output device Concept keyboard - Input device - Overlay keyboards are often used as a quick and easy way to input items with just two buttons. Trackerball - Input device - A trackball is a pointing device consisting of a ball held by a socket containing sensors to detect a rotation of the ball about two axes--like an upside-down mouse with an exposed protruding ball. Optical mark - Input device - Many traditional OMR devices work with a dedicated scanner device that shines a beam of light onto the form paper. recognition (OMR) - Input device - Input device - The contrasting reflectivity at predetermined positions on a page is then used to detect the marked areas because they reflect less light than the blank areas of the paper. Plotter - Output device - The plotter is a computer printer for printing vector graphics . MICROPHONE - Input device - An instrument for converting sound waves into electrical energy variations, which may then be amplified. Biometric Scanners - Input device - Biometrics is used in computer science as a form of identification and access control. It is also used to identify individuals in groups that are under surveillance. ASCII code - Output device - It uses codes from the table to transfer information that we can all read. Touch screen - Input device - A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. THE END,THANK YOU!