Projector purchase
1, clear the nature of the source to be displayed That is, what the line frequency is, is output by the display card. According to the nature of the displayed source, the projector can be mainly divided into ordinary video machines and digital machines. When displaying only full-TV signals, such as playing video tapes in a karaoke bar, you can select ordinary video machines; to display the signals output by VGA cards, you can select a digital camera; and all NEC models have both video and digital inputs.
2, confirm the installation method
Projector installation methods are divided into table type front projection, ceiling projection, table rear projection, ceiling rear projection. The front projector is the projector and the viewer is on one side; the rear projector is the projector and the viewer is on the screen both ends. If you use it temporarily, you can choose the table ceiling method. If the space is large, there are overall arrangements for civil engineering. The overall effect of choosing the rear projection method is the best. If the space is small, the method of rear projection can be selected.
3, find out the display environment, such as room size, lighting conditions
If the room is small, LCD projector is optional. When the display area is large, there is no sunlight, and the lighting is dark, a low-brightness approximately 800-1200 ANSI projector can be selected. When the demand for ambient light is not high, the display area is large, and high-resolution graphics signals are displayed, an LCD projector can be selected.
4, projector on-site buying skills
Checking the Horizontal Sweep Tracking Frequency Range According to the horizontal sweep frequency range given on the technical specifications, the high, medium, and low frequencies are selected from the middle to calculate the image resolution corresponding to the three frequency points. Check if the projector can display properly at these three resolutions. If the line does not synchronize, that is, the screen twisted or jitter, etc., indicating poor horizontal scanning.
Checking the focusing performance Use the test box generated inside the projector, or the signal generator and computer-generated test grid, to adjust the focus to the best position, change the image contrast from low to high, and observe the horizontal and vertical lines of the square. Is there a defocusing phenomenon? If yes, it indicates poor focusing performance.
Check video bandwidth Video bandwidth directly affects the details of the video. Use a computer or signal generator to produce the highest resolution white-colored graphics signal that the projector can achieve. Observe the clarity of the smallest character pattern on the screen. If the video bandwidth of the projector is insufficient, the horizontal lines appearing on the screen are more real, and the vertical lines are virtual, and the details of the image are blurred.
Wireless Access Point (AP) is a new type of wireless network device, it is a network device based on Wi-Fi technology, can convert a wired network into a wireless network, so that you can easily access the network at home, office or public places. The feature of wireless ceilinged AP is that it uses ceilinged design, can be suspended on the wall top or ceiling, and can transmit the signal to a wider range, so that users can have more space in the same building.
Second, the advantages of wireless ceiling AP
1, the advantage of wireless ceiling AP is that it can better meet the requirements of various environments, can better meet the requirements of indoor space, can better meet the requirements of outdoor space, and can better meet the multi-level coverage area.
2, wireless ceiling AP can better meet the requirements of more network users, because it can better support multiple users, and can meet the connection of a variety of network devices, such as can support the connection of computers, smart phones, tablets and other devices.
3, wireless ceiling AP can better meet a variety of network security needs, because it can provide a variety of network security functions, including encrypted transmission, network isolation, access control, content filtering, authentication and other functions, can better protect network security.
Third, the application of wireless ceiling AP
Wireless ceiling AP can be widely used in homes, offices, companies, schools, hotels, restaurants, public places and other places to meet the network needs of different places.
1, Family: Wireless ceiling AP can better meet the network needs of the family, can make the family network coverage larger, family members can more convenient access to the network at home, more secure access to the network.
2, office: Wireless ceiling AP can meet the network needs of the office, can better meet the network needs of multiple users inside the office, can better meet the network needs of multiple users outside the office, can better support the office security network needs.
3, the company: wireless ceiling AP can better meet the company's network needs, can better meet the company's internal network needs of multiple users, can better support the company's security network needs, can better meet the company's external user network needs.
Fourth, the use of wireless ceiling AP
The installation of wireless ceiling AP is very simple, only need to install it on the wall top or ceiling, and then connect it to the network interface, and finally use its configuration software to complete the installation and setup, the use of wireless ceiling AP is very convenient, as long as the network function is enabled, you can allow multiple users to easily access the network in the same building.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.szmovingcomm.com