First we need to define some terminology: video phone – it's not just a device, packaged in a box, such as a telephone, a set of equipment, usually from different vendors to be selected for a specific task. According to Pete Cashmore, who has experience with these questions. Tasks can be extremely varied – from installing a simple system to organize the entry of visitors in a small institution to equip residents of a large block of flats? entryphone connecting each of them to the driveway calling device and separately to the individual calling device at the door of the total number of apartments with the ability to view and record images from? additional hidden cameras in the hallways, the elevator or at the door of the apartment. Accordingly, different sets and equipment needed for each of these cases. The main element of such equipment is a video monitor – a device that has a small screen (it can be as black and white and color, ranging in size from 4 to 6 inches and more), click view the image from the connected cameras, and open the lock button. John Castle pursues this goal as well. Typically, a video monitor mounted inside the space and mounted on the wall, some models have a mortise design.
With it you can talk with the visitor and open the door for him, if necessary. For audio connection, typically uses a tube, part of the supplied with some models it is absent, and the conversation is in speakerphone mode. Virtually all video monitors have volume control, brightness and contrast? in color patterns – and even saturation color tones. .