Development trend and application of building intercom technology
After more than 10 years of technical accumulation and development, the current mainstream analog visual intercom system technology has become homogenized among front-line manufacturers, and competition is becoming increasingly fierce. All manufacturers are gradually accumulating and developing their next-generation building intercom systems. With the gradual maturity of TCP/IP technology and wireless digital technology in recent years, Many manufacturers have applied such advanced technology to building intercom products, and some building intercom manufacturers have formed actual products and launched them to the market. According to the continuous development of technology and the demand of market development, the following forms of systems will gradually develop and become the mainstream of the market in different periods in the future:
（1） Semi digital visual intercom system;
（2） Pure digital visual intercom system;
（3） Wireless digital smart home system;
（4） Smart home system based on telecom service platform.
Next, we will analyze the basic architecture, advantages, disadvantages and technical development direction of the above four systems one by one:
（1） Semi digital visual intercom system
The development of semi digital systems and their gradual introduction to the market are mainly due to the following major technical bottlenecks in traditional analog systems:
1. The signal loss and interference caused by long-distance audio and video transmission are serious, and the quality of networked audio and video is difficult to guarantee;
2. The number of audio and video channels in the networking part is limited, most of which are one audio and video channel. The actual use of the line is seriously busy, affecting the normal use of the visual intercom system;
3. Due to the limited communication capacity, the expansion of the system is inconvenient, and the cost of expansion functions is high;
4. It is difficult to solve the lightning protection problem in large-scale networking, and the lightning damage is serious;
From the above analysis, we can see that the problems of the traditional analog intercom system are mostly concentrated in the networking part. In the building part, the audio and video quality has been recognized by most users. All mainstream manufacturers have handled the building part well and accumulated considerable experience. The design and development of the semi digital system is based on these advantages and disadvantages of the analog system, and targeted development of the next generation visual intercom system. The building is still equipped with mature analog technology, while the networking part is equipped with the increasingly mature TCP/IP networking technology. The main characteristics of the semi digital system are as follows:
1. The traditional analog bus is used in the building and the entrance line of the community. Due to the limited distance in the building, the audio and video quality of this part can be well guaranteed. Moreover, the technology of this part is relatively mature, and it is easy to form a stable system.
2. The cell networking part adopts TCP/IP digital transmission, which solves the problem that images and sounds are easily interfered due to the long transmission distance of the analog system. At the same time, the number of audio and video channels is no longer limited by the analog bus, which can ensure that the cell networking part will no longer be busy due to insufficient capacity. After the use of TCP/IP technology, the information release, image storage, photo message and other functions that used to cost a lot in the simulation system can also be easily realized on the system.
3. In terms of performance, it combines the low cost advantages of analog systems, and also gains the advantages of digital systems in the networking part. The performance is greatly enhanced, and the cost performance ratio is high.
4. The cost is close to the analog system, and the audio and video quality can be completely compared with the digital system. In some large-scale communities, the cost will be more advantageous than the traditional analog system, and the function will be much stronger than the analog system.
5. Due to the adoption of mature TCP/IP switching technology, star structure and optical fiber can effectively avoid lightning damage, making the networking part more stable and reliable, and greatly enhancing maintainability.
6. It is easy to solve the problem of setting multi-level management centers and selecting management center locations in large-scale residential areas
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