Digital Video Intercom: Principles, Requirements and Future Trends

The principle of digital video intercom technology The digital video intercom system consists of several modules: indoor unit, elevator, switchboard, and management machine.

Visitors visit the designated indoor unit by dialing the elevator. The elevator uses the digitalization of the visitor's audio and video information to transmit the coded compression to the designated indoor unit. The indoor unit receives the video signal transmitted from the network for decompression and display. After the identity of the visitor, press the unlock key to open the door lock of the ladder. At the same time, VoIP is also implemented between the escalator and the indoor unit, and the two terminals can implement two-way voice intercom, providing the owners with the need to identify and communicate their identity.

Between the two indoor units or the indoor unit and the management unit, the system provides two-way video and voice transmission functions. In the realization of functions, the ladder machine and the management machine can all be attributed to the indoor unit. The function of the indoor unit is the most comprehensive, and it realizes compression and transmission of audio and video, reception and decompression display and echo cancellation functions, and can also be used as an implementation terminal of various network value-added services.

The traditional building-view video intercom products gradually move toward digitization, networking, and intelligence. In addition to video intercom products such as video intercom, remote unlock, and alarm, it also realizes remote video surveillance and transaction alarms. , access control, three forms of copy, information release, smart home control, Internet access, video on demand and even mobile phone linkage and other value-added services. Most of these products have built-in powerful SoC processors and touch TFT displays, especially the standard network functions, which bring more imagination to the product, and will more and more integrate PVR, DPF digital photo frame, With digital media capabilities such as phones and media players, digital video intercom quietly acts as another center of the digital home.

Digital video intercom product requirements (1) Security Video intercom products are security products, and their basic functions are still to meet the security needs of families and communities. Therefore, the user wants the video intercom system to provide further security functions while providing video calling and remote unlocking. If the owner is not in the home, he can remotely monitor the activities of the elderly and children in the home. When a fire, gas leak, or thief comes into the household of the household, the tenant can immediately notify the management office or the household (for example, by SMS).

(2) Stability The video intercom product is a security system that requires 24 hours of operation. Therefore, the user requires excellent stability of the product. Only stability can ensure safety.

(3) Practicality Only practical products have strong vitality. The existing products in the market are not practical, and some family-installed video doorbells may only be used once a week or two, because the functions are too simple and not practical. If households choose to buy or not, it is believed that many consumers will choose “no”. To make video intercom products popular with families, its practicality is the key. If you can browse your photo collections through the video doorbell, consult frequently used telephones, and collect monthly expenditure information, your equipment utilization and attention will be greatly improved, and only the equipment utilization rate will increase. Real prosperity.

(4) Standardization and openness Currently, there is no standard for video intercom products. Products of different manufacturers cannot be compatible with each other. The video intercom subsystem can not be interconnected with other weak electronic systems. The reason is that there is no standard. Without standards, there is a lack of openness. The system cannot be interconnected, and it will be impossible to ensure long-term product warranty and service, and the industry cannot develop healthily. Therefore, the market is very much looking forward to the emergence of standardized and open products.

The launch of the “Diagram Application of Property Management in Construction and Residential Community” of the national standard is a good thing that deserves great cheer from the industry. It points out the direction for the healthy development of the industry. For example, the "Standard" consultation draft points out:

Integrated security management integrates perimeter network alarm systems, patrol management subsystems, closed-circuit television monitoring subsystems, home security alarm subsystems, vehicle management subsystems, and public broadcasting subsystems in buildings and communities into a unified network. Integrated Integrated Security Management Platform (SMS). Through the centralized and distributed security and anti-theft alarm monitoring and management center in the building and community (including the remote alarm monitoring and management center), the implementation of the alarm information monitoring, alarm confirmation, operation control, alarm information recording and query.

The "Standard" emphasizes that integrated security management (including video intercom systems) must integrate subsystems, and standardization and openness are the key. In the big direction, IP protocol will be the key standard for the integration of various subsystems. Easy to implement integration approach.

(5) In the fashion market, existing intercom products are difficult to talk about in terms of appearance and application, compared with consumer electronics such as mobile phones, color TVs, and game consoles. As a consumer electronics product for the home, video intercom products must take the road of fashion, realize the appearance of novelty and unique, rich and colorful applications, the industry can be healthy and prosperous.

The trend of digital video intercom development From the perspective of the demand market, the technical level of the bus structure technology has entered the period of flat demand, but the overall market demand continues to heat up. The demand for building intercom products is always closely related to the development of the real estate industry. In recent years, more than 90% of new commercial buildings in big cities have been designed with this system. From the perspective of development trends, the building intercom system is a must-have system for new residential communities. In addition, some old buildings, residential units, etc. also need to be reconfigured to configure the system. Most of the county's new-level properties are not involved in this system. This shows that there are still many gaps in the market that need to be opened up.

The trend of networkization is the development of some products' full-service IP data service networks: based on the existing video intercom systems, the existing broadband network data transmission platforms or separate cell Ethernet networks are built to complete digital transmission of voice and video. Means to implement information storage, forwarding, and sharing as the application goals. Through visual terminals, each user is assigned a video call number based on an IP address to provide users with video calls over the Internet, VOIP, video surveillance, intra-cell/intra-cell/ In-building intercom, community public information release, video on demand, visual distance education, IPTV and other personalized multimedia services, and can achieve interconnection with the "3G" network. The intelligent trend is to integrate a complete set of home intelligence functions in the system (including video intercom, closed-circuit monitoring system, parking management system, three-table copying system, background music system, electronic patrol system, access control card system, property Management system, broadband network and access system, etc. The smart home trend is simply the use of ARM embedded technology to access the Internet and telephone signals, convert it into control signals, communicate via home internal data bus, wireless communication, power line carrier, etc. The home appliance control system realizes interconnection.

As far as market products are concerned, the product development speeds of these two different technology routes are very rapid. The products of smart home products can be regarded as the integration of the former proprietary areas of smart homes and the existing visual intercom fields. mature. This position has a number of well-known foreign brands, but also a number of domestic brands and other visual intercom industry on the scale of the new force; IP network technology bottlenecks are relatively high. According to the maturity of technology, IP networked video intercom products have already achieved the digital acquisition, transmission and compression process of audio and video signals. The wiring can also be done directly with a RJ45 network cable and a power line.

In summary, the development of video intercom products will be developed in terms of security, stability, practicality, standards, openness, fashion, etc. Only products meeting the requirements can lead the development trend of video intercom products.