The working principle of video intercom
Video intercom, the alias is building intercom or video door bell, and the English name is Video door phone or Video door bell. Introduced from developed countries in the 1990s, it has achieved rapid development in China. Since the end of the 1990s, it has been mainly used in commercial residential buildings, and its scale has developed rapidly, and it has been widely used in middle- and high-rise residential buildings in urban communities. When in use, the resident hears the ringtone, just like answering a video phone, accepts the call from the visitor through the host at the door downstairs, and conducts a conversation. At the same time, the visual extension in the household can receive video images through the host camera downstairs, and the resident observes the extension display The surveillance image on the screen confirms the identity of the visitor, and finally decides whether to press the unlock button of the indoor extension to open the electronically controlled door lock connected to the host at the door, allowing visitors to open the door and enter.
Video intercom is an audio-visual communication system for residents in residential communities and visitors. It is the first line of defense for residents in residential communities from illegal intrusion. Through the setting of this system, residents can use the intercom/visual intercom extension at home, through the intercom/visual intercom door host located at the door of the unit building, to talk to visitors and through the extension screen Image, to identify the visitor. When the visitor is confirmed, the owner of the household uses the door lock control button on the extension to open the electronically controlled door lock on the main unit at the entrance of the unit building to allow the visitor to enter; otherwise, all people who are not in the unit building and unfamiliar visitors will be allowed to enter. no enter.
The system can also be connected to alarm devices such as emergency alarm buttons, infrared detectors, magnetic door and window magnets, smoke detectors, combustible detectors, etc., to notify the management center of illegal intrusion, fire alarm, gas leakage, and emergency help in time. Providing residents with a convenient and safe life and reducing the troubles of residents unwilling to be disturbed is also a reflection of the grade of the residential community and the identity of the residents.
