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1) The composition of the host: The door host includes the panel, the bottom box, the operation part, the audio part, the video part, the control part A, and the panel: the operation surface of the host, all exposed on the mounting surface, providing the user with operations. The panel of the building intercom system host is generally required to have a metal texture, and it is mainly required to achieve a certain level of protection to ensure that the host is robust and durable. There are also panels of plastic texture, which are generally used for early products and single-use machines;
B. Bottom box: The installation of the host computer is a buried burial (surface mounted) box, which is mainly fixed by the bottom box (usually with a buried wall installation, a door installation, etc.), and the panel of the host is then fixed on the bottom box. The materials used for the bottom box of the host machine are based on different manufacturers of metal bottom boxes and plastic bottom boxes, but the main principle is solid, avoiding the squeezing deformation caused by concealed installation. Nanning, Guangxi IP video doorphone doorbell price C, the operating part: the operation is the most basic requirements of the host, the operating part is on the host panel, usually by the operation of the key part and the operation display part. The operation keys (direct press type keys and digital numeric keypad) generally have two kinds of metal keys and plastic keys according to the texture, and the metal keys are sturdy and durable (the host key is the most frequently used part, and the sturdiness and durability should be the first consideration. The use of the bank teller machine button on the market today is a case where the life of a single button is more than a million times. However, the disadvantage of the metal button is mainly nighttime display (some manufacturers' products have basically solved the problem of displaying metal buttons at night). The transmissive ability of the plastic buttons is relatively strong, but the disadvantage is that the durability is not strong, and the keys are prone to aging and damage.
D. Audio Part: The audio part of the host is composed of a speaker and a microphone head, and is mainly used for audio playback and audio reception. The audio part is inside the host.
E. Video part: The video part of the host consists of a camera. It completes the host's image acquisition and sends it to the extension's display through the video channel. At present, the video part of the building's video intercom system host is limited by space. The camera basically uses a single-board machine. The performance of the video camera is different from that of a professional surveillance system: the pixel is low (the building video intercom system extension The display screen can only reach 380 lines, the host's camera is generally used in products below 480 lines, and the backlight performance is poor. (Because the volume of the single-board machine is limited, the camera used in the building intercom system does not generally have back light compensation function, only simple The electronic shutter) and illumination limit (the black and white camera illumination in the building intercom system is all around 0.1 LUX, and all use infrared light compensation function, but the distance is limited). Due to the above reasons, the good monitoring range of the host video part of the building intercom system is generally within 0.5 meters from the host (further distances can be seen but the resolution will be reduced).
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The main unit is installed at the entrance of the security door of the building and the intercom control device. The mainframe is usually installed on the security door at the entrance of each unit or on the wall near the security door.
September 07, 2019