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Chapter 5 - Video and sound. After studying this chapter you will be able to understand: Monitors, monitors and video cards, video cards, ergonomics and monitors, data projectors, sound systems.
Lecture Video and Sound Summary of Previous We have learnt, Reasons why some computer users prefer alternative methods of input over a standard keyboard or mouse Input data by touch Game controllers Input data by light Other input types, e.g audio, video etc When to use which input device? Practical Today’s Topics Monitors Monitors and Video Cards Video Cards Ergonomics and Monitors Data Projectors Sound Systems Multimedia The word ‘multimedia’ comes from the Latin word multus means ‘numerous’ and media which means ‘middle’ or Centre Multimedia consists a large number of visual media like graphics, image, animation etc Visual Display Devices Primary user hardware for displaying visual media such as graphics, text, images Consists of components such as Monitor, Video adapter card, video adapter cable Various such devices are CRT, color CRT, DVST, Flat Panel Displays (LCD & Plasma), LED monitors, etc Monitor It is a most common output device A monitor or display (also called screen or visual display unit) is an electronic visual display for computers Originally, computer monitors were used for data processing while television receivers were used for entertainment Monitor Monitor Quality of picture we see on monitor depends upon, Monitor quality itself Video controller From the 1980s onwards, computers (and their monitors) have been used for both data processing and entertainment Technologies Different image technique have been used for computer monitors Until the 21st century most monitors were CRT but they have been phased out for LCD monitors They are categorized by color output Monitors connects to the video card of a computer system Monitors Types Different types of monitors exists, which are; Monochrome Grayscale Color 10 Sound Systems It is an integral part of the computer experience Capable of recording and playback Sound Systems Sound card are the, Device between the CPU and speakers Converts digital sounds to analog Can be connected to several devices Modern cards support Dolby Surround Sound Sound Card Sound Systems Headphones and headsets Replacement Offer for speakers and microphones privacy Does not annoy other people Outside noise is not a factor Headsets have speakers and a microphone Practical Goal for your display settings Screen resolution – 1024 x 768 Dots Per Inch – “Large Size” (120 DPI) Base Fonts - “Large Fonts” Changing your computer’s display settings Then, click here to open the Control Panel Click Start button Opening “Display” window Doubleclick on “Display” Re-setting Resolution First, click “Settings” tab Next, move sliderbar to adjust resolution to 1024 by 768 pixels Getting to “Dots Per Inch” Then, click the “Advanced” button to set Dots Per Inch Resetting Dots Per Inch (DPI) Change DPI setting to “Large Size” (120 DPI) How does everything look now? At this point, close the Display settings window and see how your desktop screens look If nothing has changed, try rebooting If you find that everything, including desktop icons and text, is now very, very tiny, you may also need to reset your base font size Resetting base font size Click the “Appearance” tab Set to “Large Fonts” Summary We have learnt Different types of monitors and their uses Cathode Ray Tube Video Cards Sound Cards Practical THE END ... Color monitors CRT It has been available for more than 70 years CRT is used Cost less than LCD monitors History of the Cathode Ray 1 85 5- Heinrich Geissler creates the mercury... produce the first cathode rays 1 85 8- Julius Plücker bends cathode rays using a magnet 186 9- J.W Hittorf establishes that the “rays” travel in straight lines 188 3- Heinrich Hertz concludes incorrectly... electrically charged metal plates 189 5- Jean-Baptiste Perrin shows that cathode rays are particles because they deposit a negative charge where they impact 189 7- J.J Thomson discovers electrons