Teach You How To Distinguish Genuine And Fake Projector
Although Projector The prices have been gradually "common people"
, but for the ordinary working family, the price of the yuan is still a little "outrageous"; in order to avoid the cohabitation of the projector market, the selection of the fake and shoddy products, for their economic losses , you'd better learn to identify some of the projector in the tactics of performance to ensure that elections to the low price and high quality boutique.
Identify video bandwidth So-called projector video bandwidth, in fact, refers to the total bandwidth video channel size, the numerical size of the input signal in the projection down to 0.707 times the amplitude of the time, corresponding to the maximum signal frequency output projection. As 0.707 times the bandwidth of the corresponding increment is-3db, so the video bandwidth, usually referred to as-3db Bandwidth. The identification of video bandwidth performance, the projector can verify your details in the projection ability. In identifying the performance, you can make use of professional signal generator, or directly with the computer, try to be an ideal state can obtain a maximum resolution of the projector, the background image for the white signal input to the projector machine, and then carefully identify the projection screen image displayed on the screen to see the smallest characters on the screen display is clear. If the projector close to the ideal of high-resolution conditions, the smallest character is still visible, then also, it means that the projector's video bandwidth of good performance; the contrary, high-resolution image signal in the projection screen when the characters hair looks a bit empty, or the level of line feel more solid, vertical lines are not clear, then it shows that the projector's video bandwidth performance is not good.
Performance differential focus Projection screen is usually the smallest display unit pixels, the smaller the value, then if the pixel on the projection screen shows the higher display resolution. In the CRT projector, the pixel size is normally provided by the focusing properties of the projector determined. Therefore focus on the performance of identification that can help you test the projector display is very clear, if the focus on good performance, then it indicates that the projector is easy to adjust, but also easier to projection out of harmony, a clear picture effect, if the focusing properties not good, the projection to the text and images on the screen will not clear. In identifying the performance, you can make use of a professional signal generator, or the use of computers to the projector a square input signal, and then to identify the grid's display. Of course, differential focus performance using this method, you first need a computer to the projector output a random text message, and then gradually adjust the projector's focal length, with the naked eye until you feel the text on the projection screen is clear so far; and then maintained The size of the same focal length, then a professional signal generator and projector RGB port directly connected, then the box to the projector input signal, and observe the signal in the specified grid projection focal lengths, it can clearly show that if not clearly shown, then it indicates that the focus on performance is not a good projector; At this point, you may wish to then gradually adjust the contrast projection display, the best allowed to change from low to high value, and then look at squares in contrast to gradually change process, its horizontal and vertical edges have defocusing "suspects" are quite obvious if the defocusing case, determined that the projector can focus on performance is not good.
In addition, each test about whether the projector includes local amplification, picture freeze function, trapezoidal correction function, the projector also identify a way of focusing performance good or bad, because the focusing properties of the projector is set up in the projector screen freezing, keystone correction technology, based on partial amplification technology, if you buy the projector even these most basic skills are not, then its not good to focus on functions where.
by: heiyou
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