Speakers and projectors
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10/20/2012
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Transcript of Speakers and projectors
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History and Introduction to Speakers, Headphones, and Ear buds
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In 1877, German, Ernst Siemens patented the first loudspeaker on Dec. 14, 1877. Englishmen, Sir Oliver Lodge received the second patent for a loudspeaker on April 27, 1898. This was all before music was electrified.
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In 1924, two General Electric researchers, Chester W. Rice and Edward Washburn Kellogg patented the modern, moving coil, direct radiator, loudspeaker, which become the prominent design for all loudspeakers The Rice and Kellogg loudspeakers were sold to consumers under the name of "Radiola'' loudspeakers beginning in 1926, and were superior to anything previously invented by lowering sound distortion and raising audio quality for the consumer.
In 1958, the first box-enclosed loudspeakers were invented by the Cabesse, a French company.
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An audio output device produces music, speech, or other sounds
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Most computer users attach speakers to their computers to:
Generate higher-quality sounds for playing games
Interact with multimedia presentations
Listen to music
View movies
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Sound systems are especially useful to people who use their computer to create or use multimedia products, watch videos or listen to music, or participate in online activities such as videoconferences or distance learning.
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Headphones are speakers that cover your head or are placed outside of the ear
Ear buds (also called earphones) rest inside the ear canal
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Some speakers are specifically designed to play audio from a portable media player
Wireless speakers
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Cone: this is what pushes the air and begins the sound wave’s journey. Most modern tweeters move air with a dome rather than a cone.
Voice coil: the electromagnet that drives the cone. Magnet: the non-changing magnetic field that allows the
voice coil’s alternating magnetic force to be attracted or repelled.
Spider: a springy cloth disc that keeps the voice coil and bottom of the cone from moving off to the side while allowing it to move forward and backwards.
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Surround: a springy ring that keeps the top of the cone from moving off to the side while allowing it to move forward and backwards. Together with the spider, a suspension system is formed for the parts that move, the moving parts being the cone and voice coil.
Frame (or basket): what holds all these parts together.
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ALI HAIDER REG NO:1245148
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A projector is an apparatus for presenting an
enlarged image on
a screen from a transparency such as a
photographic slide or a film.
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Louis Lumiere, one of the first inventors of moving pictures, is quoted as saying, "The cinema is an invention without a future." And yet Lumiere, along with a number of "co-inventors" who spanned over three centuries, made steps toward an incredible future for the cinema. The projector has come a long way since his time, and still its beginnings are no less imaginative than the moving pictures we see today.
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There are many different uses for projectors. Though not all of them are equipped for all the tasks, there are some that meet the needs of most people. Join me as we take a look at the various uses for projectors In the home, a projector can be used as a home cinema
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There are other uses to projectors in the home. For example, it can be used as a monitorfor a computer or laptop. This can work great as it allows you a screen size no monitor can provide!
This works better with HD models, as on old style equipment, the resolution may not be up to scratch. As projectors improve in technology, they are getting used more with computer related needs. This can only benefit you.
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This works better with HD models, as on old style equipment, the resolution may not be up to scratch. As projectors improve in technology, they are getting used more with computer related needs. This can only benefit you.
Projectors are even used by clubs and other organizations. At chess tournaments, projectors are used to show an audience the position of play as well as the time remaining on the chess clock. Projectors can even be used to create holiday displays, and decorations for events such as weddings and parties.
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Projectors have a lot of functions that are similar to televisions, as well as many that are unique to projectors.
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projectors are able to reproduce lifelike colors on the screen by projecting light through a mixture of these colors in various ways beforehand in a projector mechanism Minute image elements called Micro Devices (MD) such as LCD (Tran missive LCD) and LCOS (Reflective LCD) are used in LCD projectors.If you look closely at the screen of a cathode-ray tube TV, you can see groups of small dots of "red, blue and green". These red, blue and green colors are called "three primary colors of light (RGB)" and various colors are displayed through a combination of these 3 colors.For example, mixing red and blue light creates purple light. Mixing green and red light creates yellow light. Mixing the three colors of red, blue and green light with the same brightness creates "Transparent light". LCD projectors
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