Building intercom technology trends and applications
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I. Introduction
The earliest building intercom system originated in Europe and the United States and other developed countries. It has been in Europe, America, Hong Kong, Taiwan and other regions for more than 20 years. Since the late 80s of this century, it was gradually introduced to the mainland. At that time, the main domestic agent was single-family products for foreign countries. The main products are Korean and Taiwanese brands, which are sold in Shanghai, Guangdong. Since the early 1990s, foreign manufacturers of building intercom systems have gradually opened up markets in China, but the earliest building intercom products have a single function, mainly including unit intercom and visual single doorbells. During this period, domestic market demand Less than 100,000 households. After the first development period of the domestic market in 1995-1997, several professional video intercom manufacturers such as Shenzhen Shidian, Guangzhou Anjubao, and Zhongshan Amin appeared in the Pearl River Delta region. Fujian Zhenwei, Xi'an Jiaotong University Kaiyuan, etc., these manufacturers began to scale production, technology continues to progress, unit building intercom and video intercom users showed a sustained growth momentum, concentrated in the real estate market started earlier in Guangdong, Shanghai, etc. In economically developed cities, at the end of the 1990s, building intercom products entered a second period of rapid development. Large-scale community networking and integrated intelligent building intercom equipment began to emerge. Zhuhai Taichuan, Shenzhen Huiruitong, Fulin Forest, Zhuhai into the frame, etc. Also launched their own products. After experiencing foreign products, independent research and development of single-family units, analog non-visual systems, and analog visual systems, a visually-networked building intercom security system has gradually become the mainstream product building intercom market.
Second, the technology development trend and application of building intercom
After more than 10 years of technology accumulation and development in building intercom, all mainstream manufacturers of analog video intercom system technology have become homogenous and the competition has become more and more fierce. All manufacturers are gradually embarking on the next-generation building intercom system. With the accumulation and development of technology, with the gradual maturation of TCP/IP technology and wireless digital technology in recent years, many manufacturers have applied such advanced technologies to building intercom products. Some manufacturers have already formed actual products and market them. According to the continuous development of technology and the needs of market development, the following types of systems will gradually develop and become the mainstream of the market in different periods in the future:
(I) Semi-digital video intercom system
(II) Pure digital video intercom system
(III) Wireless Digital Smart Home System
(D) Smart Home System Based on Telecom Service Platform
Here we analyze the basic architecture, advantages and disadvantages of each of the above four systems and the direction of technological development.
(I) Semi-digital video intercom system
The development of semi-digital systems and their gradual approach to the market are mainly due to the following major technical bottlenecks in the traditional analog systems:
1. The signal loss and interference caused by long-distance transmission of audio and video are serious, and the quality of the networked audio and video is difficult to guarantee.
2. The number of audio and video channels in the networking part is limited. Most of them are audio and video channels all the way. The actual use of the channel is serious and affects the normal use of the video intercom system.
3. Due to the limited communication capacity, the system's expansion is inconvenient and the cost of extended functions is high
4. The lightning protection problem is difficult to solve in large-scale networking and is severely damaged by lightning strikes
From the analysis above, it can be seen that most of the problems of the traditional analog intercom system are concentrated in the networking part. In the interior part of the building, the quality of audio and video is still recognized by most users. The mainstream manufacturers deal with the part inside the building. It is better and has accumulated a considerable amount of experience. The design and development of the semi-digital system is based on these advantages and disadvantages of the analog system, targeted development of the next-generation video intercom system. The building is still using mature analog technology, and the networking part is using the mature TCP/IP networking technology. The main features of the semi-digital system are as follows:
1. The traditional analog bus is used in the building's buildings and part of the entrance line. Since the distance within the building is limited, the audio and video quality of this part can be well guaranteed, and this part of the technology is relatively Mature, easy to form a stable system.
2. The cell networking part adopts the TCP/IP digital transmission, which solves the problem that the image and sound caused by the analog system's transmission distance are far more susceptible to interference. At the same time, the number of audio and video channels is no longer limited by the analog bus, and it can ensure that the cell networking part is not Again, there is a busy situation due to insufficient capacity. After the adoption of TCP/IP technology, the previous simulation system was able to cost-effectively release information, store images, and record messages, which could be easily implemented on the system.
3. The performance of the simulation system integrates the low-cost advantages. At the same time, the digital system has gained the advantages of the digital system. The performance has been greatly enhanced and the cost performance is higher.
4. The cost is similar to the analog system. The audio and video quality can be compared with the digital system completely. 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, the use of star-shaped structures and optical fibers effectively avoids the damage caused by lightning strikes. This is a more stable and reliable part of the networking and greatly improves maintainability.
6. It is easy to solve the problem of setting up the multi-level management center of a large-scale community and locating the location of the management center.