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Projector can be divided into general video machine, digital machine, graphic machine three categories. When only full TV signal is displayed, ordinary video machine can be selected. To display the VGA output signal, horizontal frequency available under 60 KHZ data projector, numberical machine's choice, in order to save resources, do it right, can according to the actual content of projection resolution to buy which grade of the projector, if the screening of general education and word processing software, is to choose a resolution of 800 * 600 (SVGA); If the requirements are higher, it is necessary to choose XGA(1024*768), now the market has appeared SXGA(1280*1024) products, later will also have UXGA(1600*1200) products, when the display of high resolution graphics signal, must choose the line frequency in more than 60KHz digital machine.
