Visual intercom system working principle Video intercom system type

The Video Intercom System is a set of modern residential residential service measures. It provides two-way video calls between visitors and residents. It achieves dual image and voice recognition to increase safety and reliability, saves a lot of time, and improves work efficiency. What is the working principle of video Intercom System ?

【Video Intercom System Working Principle】
Visual building intercom system with full functions such as door-to-door, camera, intercom, indoor surveillance room, indoor remote unlock, night vision, etc.; the occupants can visit the indoor 4” ultra-thin flat panel while talking to visitors indoors. The image is controlled by the unlock button to open the iron gate, so as to prevent strangers from entering the building and has high security.....
Visual building intercom system to prevent the invasion of foreign personnel, to ensure the safety of home, played a reliable preventive role. Visual building intercom system can clearly see outdoor visitors regardless of day and night.
The visual building intercom system is a device that is connected to each host's indoor and stairway entrance gates by a basic unit such as a door entrance host, an indoor visual extension, an uninterrupted power supply, an electronically controlled lock, a door closer, etc., in the intercom system. Based on the increase in image transmission capabilities.
What kind of video intercom system?
1. Direct Push Talkback System A call button is set for each occupant on the host. Each key is connected to the corresponding occupant through the call line, as shown in Figure 1. Directly press this household call key to call the tenant directly, which is intuitive and easy to use, but no privacy function. The connecting system of this type of building intercom system requires a call connection line for each household except the four call lines, call lines, lines, and ground lines. If there are 20 households in this building, 20 will be needed. Root call line. The cost of the host system is lower, but the cost of the connection system is higher, and there are more circuit connection lines and the connection is complicated.
2. Digital Intercom System

0 to 9 digit keys are set on the host computer, a built-in code recognition system, each household set a group of digital codes, enter the password of the household in order to call the household, if you do not know the code, can not call, have a certain degree of confidentiality Function to prevent users from being disturbed unprovoked. All users of this type of intercom system can connect to the host through a common call line. After entering the numbers, the coding system recognizes and then calls the corresponding user. This type of building intercom system has a higher host cost, but it has fewer connection lines and low cost. It only needs five common lines: call line, call line, call line, line, and ground.
3. Video intercom system Video intercom system is divided into direct-view video intercom system and digital video intercom system. Except for setting up the camera on the main unit and setting up the visual equipment on the extension, the system is connected to the above-mentioned category 1, 2 On the basis of the connection line, video signal connection lines or video amplifiers need to be added, and each user must also add a small power supply for video display.