The projecting camera may divide into the ordinary video frequency machine, the numeral machine, the graph machine three kinds. Only demonstrates when entire television signal, may choose the ordinary video frequency machine; Must demonstrate VGA output signal, below serviceable good frequency 60KHz data projecting camera, choice numeral machine, in order to save the resources, achieves just right, then may purchase what kind of scale according to the actual projection content resolution the projecting camera, if shows software is take the general teaching and the language processing as focus, then selects and purchases the resolution is 800*600 (SVGA); If requests high somewhat, then must choose XGA (1024*768), now in the market already appeared XGA (1280*1024) the product, later also will have UXGA (1600*1200) the product, when demonstrated when high resolution graph signal, had to choose the good frequency above the 60KHz numeral machine.


The use way projecting camera use way divides into is throwing, the suspended ceiling is throwing, the back throws, hangs the top rail throws. Is throwing is the projecting camera in audience's identical side; The back throws is the projecting camera and the audience separately (must carry in the screen beginnings and ends throws curtain). If fixedly uses, may choose the suspended ceiling way. If has the enough space, chooses the back throws the way overall effect is best, if the space is smaller, may choose the back throws the refraction the method.