Popular Science: Numbers? simulation? Smart home intercom system is silly and unclear

Analog video intercom systems use analog technology to transmit audio and video signals. Generally, bus technology is commonly used to transmit signals. This technical system has the following main problems:

1. Poor anti-interference ability. Due to interference, there are often no signals or images, and the sound is not clear;

2. The transmission distance is limited. The analog signal is easy to attenuate and distort, and the amplifier is added at a long distance, not to mention the increase in networking cost, and the signal reductiveness cannot be ensured;

3, the use of bus technology is particularly busy. Because only two calls are allowed on the same bus;

4. Single function. In addition to supporting simple information publishing functions, it is mainly limited to functions such as calling and unlocking, and the device usage rate is low;

5. The limitations of product upgrade or expansion are large;

6. It is difficult to integrate with other weak electronic systems. The industry lacks standards, products from different manufacturers cannot be interconnected, and it is difficult to integrate with other weak electronic systems;

7. The wiring engineering volume is large, the service cost is high, and it cannot be integrated into the community integrated network.

These shortcomings of the analog video intercom system not only seriously affect the stability and reliability of the system, but also can not meet the differences in functional requirements between different brands.

Digital video intercom system: completely adopts TCP/IP technology. All indoor equipment, door machine, wall machine, management machine and other terminal equipment adopt TCP/IP technology, combined with the latest digital audio and video compression technology and DSP technology. Streaming media and IPV6 network transmission technology to achieve. Its main advantages are reflected in the following aspects:

1. Compared with the analog video intercom system transmitted by the bus system, the digital video intercom system is much more convenient in wiring and installation and debugging. Since the digital video intercom system uses TCP/IP to transmit signals such as sound, data and video images, a network cable can solve all problems, greatly simplify the wiring engineering, and make the installation and debugging of the building intercom system change. It is simple and the construction period is greatly shortened.

2. Once all the signals are digitized, it is easy to meet the networking needs. The digital video intercom system's indoor unit is like a small computer with high-performance CPU and DSP digital processing chip. The powerful data processing capability makes the networking function powerful and provides integration with other security subsystems. Convenient.

3, IP networking has a strong scalability, it can not only achieve video intercom, but also enable multimedia information transmission, broadcasting, security alarm, smart home , IP videophone, VOD on demand, video surveillance, and value-added services And other functions. If you access the internet, you can configure, monitor, remotely upgrade, and remotely read any terminal (visual walkie-talkie) on the Internet. It can meet the traditional video intercom application, and can provide various functions such as security alarm and smart home control, and become the core hub of “digital home”.

4. Nowadays, the development scale of the community is getting bigger and bigger. It can also extend the transmission distance to several kilometers through the solution of video amplifier, but the cost is too high. The video intercom system based on TCP/IP has no distance limitation and can realize low-cost long-distance transmission.

For the moment, digital video intercom is in an accelerated period of development, both in the market and in technology, and is increasingly becoming an important part of the digital home.

Its three main elements: video compression, voice processing, network transmission, make digital video intercom and other home multimedia products. As the demand for digital products in the market has become more and more vigorous, digital video intercom has become the trend of the times. Many manufacturers have also seen the advantages of digital video intercom products, and they all want to catch this "golden train"!

Domestic intercom manufacturers have also focused their attention on this earlier. Some manufacturers have already produced and sold digital video intercom products, and some manufacturers are still in the research and development stage.

As a result, the digital video intercom products market is mixed, and the semi-digital and fake digital products are also flooded, making the digital video intercom products greatly discounted in the hearts of users, and still hold a wait-and-see attitude. So how do you identify the true and false of a digital visual system?

1. First, we must examine whether the standard TCP/IP protocol is used, and whether the transmitted audio and video signals are encoded and compressed.

2. See if the intermediate devices and networked devices are universal. At present, some use a dedicated switch, and some rename the converter to a switch, etc., which need to pay attention to distinguish. In general, real networked intermediate devices can be purchased directly from the market. If you can only buy them from the intercom system supplier, it is definitely not a true digital product. The real digital products are standard and universal.

3. Look at the interface. When purchasing the product, we must carefully observe the interface of the door machine, the central management machine, the indoor unit and the wall machine to see if the RJ-45 interface is used. If it is not the RJ-45 standard interface, it is definitely not a digital intercom equipment.

All along, there is a fixed concept in people's minds: "New technology means high prices, new products must be more expensive than traditional products." Then, as a leading digital intercom system, it must be more visible than traditional analog Is the system costly and costly?

In fact, from the point of view of installation and debugging, wiring, the use of TCP / IP transmission mode to reduce a small investment. At the same time, the construction period is shortened, personnel expenses are saved, wire and labor costs are reduced, and value-added services can be brought in, which is easy to maintain. Therefore, the key is how you choose!

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