Since the Beijing Security Exhibition in 2008, full TCP/IP technology and semi-digital intercom products have become quite common. The semi-digital products combining analog and digital from many manufacturers are eye-catching, and the all-digital intercom products launched by some manufacturers have become the highlights of the current intercom products. It can be seen that digital intercom products have become the technology of intercom manufacturers. An important indicator of development.
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Visual doorbell digital development
The Chinese video intercom doorbell market is undergoing a revolution from analog to digital, from bus system to TCP/IP networking. Digital and TCP/IP technologies have been widely accepted in the user market, and semi-digital intercom products and all-digital intercom products have entered the substantive application stage.
For example, Matsumoto's smart digital home 880 series is a digital building intercom system for all-IP network transmission. From indoor extension to door-to-door, to management center (PC), TCP/IP digital transmission is adopted. Since the network architecture is based on IP network, It has the fastest network communication speed and a full range of household calling functions, as well as a very powerful system expansion function.
At this stage, although the traditional analog intercom system still has a large market share, its shortcomings are becoming increasingly prominent. For example, in the wiring structure, the analog system divides the signal transmission network into a main bus (networking) and a branch bus (unit). The equipment forms a top-down hierarchical bus structure from the management machine, the community door machine, the unit door machine, the household secondary confirmation door machine, and the indoor extension. The management machine to the cell door machine, the unit door machine is the community network backbone bus, and the unit door machine to the household to confirm the door machine and the indoor extension is the secondary branch bus. Regardless of whether it is a trunk bus or a branch bus, voice lines, video, control and other signal lines need to be separately laid with dedicated cables, so the types and number of cables will be more, which will bring trouble to the system cost and engineering.
Nowadays, the semi-digital networking method has become more common, that is, the TCP/IP networking to the unit door machine, the unit door machine to the household door machine and the indoor unit still adopt the traditional bus mode. It is understood that the reason is that TCP/IP networking has obvious advantages in wiring, networking, signal transmission, system scalability, function scalability, system maintainability, network anti-interference, multi-channel communication capabilities, etc. Advantage.
Compared with the all-digital TCP/IP doorbell intercom system, the wiring is much less and much simpler. The various signals (audio, video, control) are all digitally integrated and transmitted by only one network cable, which simplifies the wiring and makes the installation of the system equipment. Debugging and maintenance are easy. TCP/IP networking can not only realize the transmission of signals such as sound, image and control, but also realize the network of the building and community intercom equipment. Because the system technology is based on digitization and networking, the system can adopt ARM platform with integrated audio and video codec module. Its powerful data processing capability and hundreds of megabytes of bandwidth make the original multiple types of signals become a single digital signal, enabling signal transmission. It has become “simpleâ€, the signal quality has been greatly improved, the anti-interference ability has been greatly improved, and it has been able to seamlessly integrate with the system perimeter alarm, access control, card, community service and other systems.
Compared with the traditional bus system analog intercom, the IP digital intercom has the following characteristics: the transmission distance is not limited by the region, and the expansion and upgrade is very convenient; the transmitted audio, video, control and other signal effects are far superior to the traditional bus mode. It can realize various functions such as home alarm, home appliance control, remote monitoring, community service, etc. It is convenient to install and debug, shorten the engineering cycle and save engineering expenses.
Video doorbell digitization
The intercom system generally includes: a central management machine, a wall machine, a unit door machine, a secondary confirmation door machine, an indoor doorbell extension, etc., which are networked through a dedicated network.
The basic functions of video intercom include two-way calling, video calling, door machine monitoring, remote control*, etc. With the development of the enhancement and the user's demand for additional functions, the current intercom system also derives the image capture storage function. Photo message function, call recording and recording function, household pass function, ladder control function, etc.
And can be integrated with the access control system to achieve transparent transmission of the access control system through the IP network. The following describes the functional performance of the main equipment of the intercom system.
Indoor extension: The basic functions are intercom (visual intercom), (emergency) call, remote control*. According to the function, it can be divided into two types of intercom and video intercom products, and can also derive the household message function, household pass function, ladder control function and so on.
Door machine: In addition to the basic functions such as calling the resident, password*, etc., it also needs to have the function of call management center. Infrared fill light and night keyboard assist backlight are also necessary for the door machine. In addition, the door machine can be integrated with the access card reader to enable the intercom system to work in conjunction with the access control system. The resident can use the ID/IC card to control the door opening through the door machine. Now the new door machine will have the following additional functions: image capture storage function, photo message function, advertisement playback function and so on. Even some door camera cameras can be adjusted by the indoor unit to adjust the field of view angles up and down, to ensure that the visible range is large enough to be suitable for the viewing of extra-high and extra-low visitors. It can be seen that the performance of the door machine is becoming more and more perfect and humanized.
Central management machine: generally has basic functions such as call, intercom, alarm reception, etc. It is the basic equipment of the intercom network system. If the central management machine is connected to a computer or directly uses a computer as a management center machine, the function of the building intercom system can be greatly expanded. Now many manufacturers have spared no effort in the management machine software, so that the management machine integrates three-table copy, information release, information query, alarm record query and other functions.
One of the outstanding features of today's intercom products is the integrated anti-theft alarm function. It is understood that most of the smart home products introduced by domestic manufacturers of intercom equipment include home security, such as the integration of anti-theft alarms, emergency alarms, smoke/gas alarms in the home.
At present, most manufacturers' products are equipped with 8 zones, and some manufacturers can reach 16 zones. Each zone can be connected to infrared detectors, door and window magnetic switches, gas/smoke detectors, emergency buttons, etc. Each zone can be used by users. Customized as an evacuation zone, a guard zone, an out zone or a 24-hour zone. There are various alarm modes. In addition to the local sound and light alarm, the alarm signal can be sent to the management center at the same time. The management function can display and record the alarm information of the household in the form of electronic map and spreadsheet.
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