Video intercoms. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Video intercoms. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Security and safety. Audio and video surveillance

Systems that perform the functions of a peephole and an intercom are called video intercoms. The shape of the video intercom resembles a telephone. It consists of a monitor and an intercom.

When you pick up the handset, the video intercom automatically turns on, which allows you to see the limited space in front of the door and talk to the person behind it. In addition, the video intercom performs the function of a call. The intercom from the visitor's side is a monoblock in which the camera, the intercom and the call button are located. Video intercom - the simplest television security system. It is small and, as a rule, is installed at the front door to a room (for example, to an apartment). As a monitor, you can use a regular TV, which is installed indoors. The camera is turned on when the doorbell button is pressed.

Video peephole allows you to conduct covert surveillance of the visitor. Outwardly, the video peephole resembles an ordinary door, but in terms of its technical equipment it is a miniature video camera with a special lens. Some types of such lenses, such as pin-holes, can be masked and made invisible to the visitor. It is impossible to detect such a video eye without special tools. By the number of subscribers served, individual, group and access intercoms are distinguished.

The individual intercom is designed to serve one subscriber and is used to protect individual apartments, offices, country houses, as well as small security posts.

A group intercom allows you to serve a small number of subscribers (usually from two to six) and is used to protect closed (that is, having one common entrance) halls located nearby offices, cottages for several families, etc. Individual and group intercoms differ in the number of blocks of the same type . The entrance intercom allows serving a large number of subscribers (from tens to several hundreds) and is used to protect the entrances of apartment buildings, office buildings, etc. Modern technology allows the production of integrated multi-subscriber, that is, designed for several entrances, intercom systems. They are designed to protect complexes of residential and administrative buildings. Thanks to one such system, it is possible to serve several thousand subscribers and close the doors of dozens of entrances.

The design of an intercom of any kind consists of the following parts:

- external block (call block);

- subscriber indoor unit;

- processor unit;

- control equipment;

- main power supply;

- backup power supply;

- communication lines;

- remote-controlled electric lock;

- door closer.

Author: Korshevr N.G.

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