The connecting system of intercom system in this kind of building needs a call connecting line in addition to four lines: sending line, receiving line, cable and ground wire. If there are 20 households in this building, 20 telephone lines are needed. The host cost of this call system is low, but the cost of connecting the system is high, and there are many circuit connecting wires, and the connection is complicated.
2. Digital intercom system
There are 0 ~ 9 digital buttons on the host computer, and a code recognition system is built in. Each household is equipped with a set of numerical codes, and only by entering the household's password can you call the household. If the household password is unknown, it can't be called, and it has certain security functions to avoid users being disturbed for no reason. All users of this intercom system can connect with the host through the call line. After entering the number, the coding system recognizes the number and calls the corresponding user.
This kind of building intercom system has high host cost, but few connecting lines are connected to the system, and the cost is low, and only five lines are needed: calling line, sending line, receiving line, cable and ground line.
3. Visual intercom system
Visual intercom system can be divided into direct press visual intercom system and digital visual intercom system. In addition to the camera on the host computer and the imaging equipment on the extension, the system is connected with the above-mentioned 1 and 2 types of connecting cables, and video signal connecting cables or video amplifiers need to be added, and each user also needs to add a small power supply for video display.
Extended data
System functional characteristics
1, based on local area network, uses TCP/IP protocol to transmit video, audio and various control signals, which is convenient for Internet connection and access.
2. Embedded hardware platform and linux operating system are adopted. Image coding adopts H.263 and H.264 compression standards, G.7 1 1 and G.726? The compression standard is different from the traditional analog building visual intercom system.
3. Use the most advanced technology in the industry to build a digital community and realize the visual intercom of the community.
4, pure screen high-definition picture display, bright colors, high performance and strong compatibility; Intelligent full touch operation.
5. An intelligent system integrating digital visual intercom, IC card access control management, information release, convenience information, advertising information, emergency broadcast, home security, photo message, electronic photo album, password unlocking, fingerprint identification, anti-disassembly, mobile detection, call transfer, hijacking code, music doorbell and emergency alarm; At the same time, functions such as home appliance control and remote meter reading of three meters can be flexibly incorporated into the system.
Baidu Encyclopedia-Building Visual Intercom System
Baidu Encyclopedia-Visual Intercom System