Analysis of System Components of Visual Intercom System

Building intercom, also known as video intercom, visual building intercom system refers to the installation of buildings or buildings in residential quarters, unit buildings, office buildings, using images and sounds to identify visitors, control door locks and encounter emergency situations. Sending help and assistance signals to the management center, the management center can also integrate device information to the residents.

Mainly by the door machine (resident door machine), indoor unit, administrator machine and Other components.

a. Indoor extension

Indoor extensions mainly include two major types of intercom and video intercom products. The basic functions are intercom (video intercom) and unlock. With the continuous enrichment of products, many products also have the functions of monitoring, security alarms and disarming, household access, information reception, remote telephone alarm, message retrieval, home appliance control and so on. The video intercom extension has two types of color LCD and black and white CRT monitors. As of 2014, many technologies were applied to indoor extensions, such as wireless reception technology and video character overlay technology. The wireless connection technology is used for the indoor unit to receive the signal of the alarm probe, and it is suitable for the difficult wiring. However, there are major loopholes in the wireless alarm mode, as the continuous transmission of the emission source of the frequency will cause the host to fail to receive the alarm signal sent by the control head. Video character overlay technology is used to receive short messages issued by the management center.

There are two types of indoor units in principle design. One is an indoor extension with a code. The splitter can be simpler, but the indoor extension costs a little higher; the other type of encoding is done by a doorway host or splitter, indoor Extensions are very simple. The LCD screens of color indoor extensions have not been domesticated in 2014 and the cost is relatively high. This is a bottleneck restricting the application of intercom systems in color video buildings.

The appearance of the intercom extension is similar to the bread telephone and tends to be diversified. Visual extensions tend to be ultra-thin handsfree wall mounts, but the most popular ones are wall-mounted black-and-white visual extensions. Indoor extensions occupy a relatively large cost in the building intercom system. From the development point of view, color extensions with security alarms and information releases are used in high-end real estate applications, while mid-range mobile phones are mostly black and white video intercom extensions. Speak extension.

b. Door host

As of 2014, whether it is the use of visual indoor competition or intercom indoor extensions, most users require the use of visual doorway host for users to choose. The host computer at the entrance is the key equipment of the building intercom system. Therefore, the appearance, function and stability are the main points of the manufacturers' competition. The main materials of the doorway are aluminum alloy extrusion profiles, die-casting or stainless steel shell stamping and forming. In terms of effect, aluminum alloy extrusion profiles have advantages. There are two kinds of liquid crystal display and digital control at the entrance of the host computer. The liquid crystal display cost is higher, but the display content is more abundant, especially the indispensable component of receiving the short message. In addition to the basic functions of calling the resident, the host computer at the door must also have the function of the call management center. The infrared auxiliary light source and the nighttime auxiliary keyboard backlight are the functions that the entrance host must have. The ID card technology and the reduction of the read head cost make the proximity card access control technology be applied to the host computer to implement the card unlocking function. In addition, for the convenience of use, many products also provide ringback tone prompts, key tone prompts, call prompts, and various voice prompts. Other functions make the performance of the door host gradually perfect.

C. Management Center

The management center machine generally has the basic functions of calling and alarm receiving, and is the basic equipment of the community networking system. The use of a computer as a management center greatly expands the function of the building intercom system. Many manufacturers spare no effort to make their integration in management software such as three-meter, patrol and other systems. With the system hardware, the management center connected by a computer can realize information release, community information inquiry, property service, call and alarm record query function, and setting up disarm record check function.