Circuit is a term that comes from the Latin circuitus and refers to the route in a closed curve, the previously established route that ends at the starting point or the terrain within a perimeter. Closed, on the other hand, is something that has no way out or that is final.
The notion of a closed circuit, therefore, refers to the interconnection of two or more components with at least one closed path. The closed circuit in electricity involves a set of sources, switches, resistors, semiconductors, inductors, capacitors, and cables, among other components.
Thanks to the closed circuit, the flow of electrical current circulates between the components. In general, a circuit of this type has devices that produce or consume current in an interleaved manner.
A closed circuit television, also known by the acronym CCTV (Closed Circuit Television), is a technology that allows you to visualize various environments for surveillance. Its name comes from the fact that the emission of the images is intended for a limited number of viewers, unlike traditional TV.
It is possible to build a closed circuit television with one or more camcorders connected to one or more televisions or monitors, which are responsible for reproducing the images. If a recorder is added, videos can be stored.
Closed circuit television is common in companies. Many choose to install cameras at the entrance, the reception, the offices, the factory and the warehouse, with the monitors located in a special room in charge of a surveillance person, who must intervene or notify the police in the case of detect any strange movement.
Depending on the technology and the brand, among other factors, the cameras used to configure a closed circuit have highly variable prices, and their performance is also very different at each end of the range of alternatives. The cheapest equipment usually offers images every few seconds, instead of an uninterrupted video sequence, although this does not always depend on the camera used.
When the monitoring is remote, that is, one or more people assume the task of observing all the movements of a home from another geographical point, the fluidity of the images responds in part to the speed of Internet connection available in the desired position be watched. On the other hand, it should be mentioned that even in cases where normal videos are sent there is a certain delay, since the information must travel from one place to another.
Although today many cities already have 100Mb / s connections, there is still a large percentage of the world’s population that barely exceeds 3Mb / s; furthermore, signal stability is usually quite poor for most Internet users, and this is directly related to the technology offered by the service provider, but also to issues such as saturation and weather.
Therefore, even in an era in which many enjoy high- quality streaming videos, this is not a widespread situation, and this is also reflected in the surveillance systems of small and medium-sized companies, which are supported by technology. dated.
In addition to the fluidity of the images, a very important factor in a closed circuit television is the quality of the images. It should not be forgotten that to know in detail the movements of a commercial premises, for example, a place where there are usually many people over several hours, it is necessary to have a good resolution, a good refresh rate and a compression system that does not cause significant losses in the frames.