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BAN2 - Angličtina pro bakaláře- mírně pokročilí 2
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Stáhnout celý tento materiálBrno University of Technology
Faculty of Electrical Engineering and Communication
Department of Languages
ENTRANCE EXAM Postgraduate Doctoral Study
FAX
Facsimile machines only came into widespread use in the late 1970s., when intenational standards were set by the Comite Consultatif Intern ational Telegraphique et Telephonique (CCITT), a body based in France. Before this, machines could only communicate with those made by the same manufacturer.
Since then fascimile technology has become increasingly sophisticated. The latest machines, which must be linked to a special digital phone line, can send a document to several places at once for the price of one phone call.
Fascimile transmission involves sending a document along a telephone line and converting the received signals into a reproduction of the original. „Fax“ machines can now send an A4 document, containing images as well as words, in less than a minute.
When you feed a document into the machine, a fluorescent lamp reflects the image on to a series of mirrors, which reduce its size so that the whole document can be reflected on to a camera lens. The lens can only read the image in black and white. This information is converted, via a microprocessor, into binary information. The machine records black as 0 and white as 1.
Another mic roprocessor then converts the binary data into digital information, which allows more data to be stored on the microchip. But because most telephone systems cannost read digital information,this is again changed, via another microprocessor (modem), into analoque tones, or pitches of noise. The first machine transmits these tones to the second.
The receiving machine converts the analogue tones back into digital and then binary inform
Vloženo: 4.06.2009
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