Analog equipment is not the first yearpredict full withdrawal from the market, as happened with cassette tape recorders. Nevertheless, even against the background of the communication revolution in the form of the appearance of wireless data transmission modules and the constant build-up of high-definition formats, this segment remains. And if in the niche of multimedia technology it is almost imperceptible, then analog video surveillance is worthy of competition to digital equipment.
These are traditional video surveillance systems thatfeed through a coaxial cable and connect to an analog DVR. The basis of the kit is formed directly by a video camera, which can also have different shooting capabilities. Most often used analog video cameras for video surveillance of budget type. They are distinguished by a monochrome "picture" of a simple lens with a fixed diaphragm and the missing possibility of changing the focal length. And on the contrary, premium models are characterized by high definition images with color transmission, which have no limitation in terms of the ability to work in different weather conditions.
At the same time, the connection scheme is almost alwaysstandard. The camera is connected to a power supply (usually an autonomous power supply unit) and a signal recorder for processing. Further, the signal that recorded analog video surveillance can be sent to the monitor of the dispatcher, to the archive or to the network.
Directly the matrix of the chambers in comparison withdigital models of the same level allow you to shoot high quality video regardless of the lighting and detail the objects in motion. As for the general infrastructure of analog video surveillance, it is free from all the disadvantages inherent in IP-devices. This includes delays in data transmission, viruses in network channels, minimum maintenance costs, and so on.
But this part of the benefits is also conditional, becauseIn today's world, the total rejection of digital equipment is almost impossible. Therefore, even at the stage of transforming the signal in the registrar, the infrastructure also encounters "digital" problems. Of course, there are a lot of negative features that analog CCTV cameras are sinning - IP cameras, in turn, also become a contrasting background, on which these shortcomings are clearly manifested. These include electromagnetic interference on transmission lines, the lack of wide-ranging real-time control capabilities, the elimination of the concept of wireless connectivity.
One of the most important problems in modernThe competition for analog cameras is the outdated low definition standards. Understanding this state of things, manufacturers have developed several new analog formats, including HDCVI and HDTVI.
The first standard is characterized by translationsignal using amplitude quadrature modulation. This means that the stream is segmented into several channels, in which, for example, the luminance and chroma signals are separated. Devices in this format allow the transmission of three signals via a single cable. Among them there will be audio, video and command signals with PTZ control technology. These are modern analog CCTV systems, in which it is supposed to control the camera through a cable - for example, the user can focus the device, scale the "picture", rotate the body structure, etc.
HDTVI technology, in turn, differs two-way transmission of control signals via the PTZ system, but at the same time, compared to the HDCVI models, provides insufficient protection against interference.
As the simplest solution for working witha converted analog camera signal can be recommended by the CamPermanent program. It has a base for programs of this type of functionality, but it is reliable and simple - for home video surveillance this is the optimal solution.
If it is planned to organize a combinedinfrastructure with the integration of elements of IP-equipment and analog signals, it is worth using the "Videolocator" system, which will unite all the security equipment into one complex.
Professional solution for analogCCTV offers developers NVR Smartec. This program allows you to organize a client-server architecture, within which a network video surveillance system will be built.
Most users of analog systems -these are consumers who, due to financial constraints, could not switch to a digital system. They value analogue means for price accessibility, familiarity of use and lack of need to rebuild the cable infrastructure.
The fact is that in many enterprisesa completely working coaxial network is maintained, which does not coincide with IP cameras. Accordingly, a quite reasonable step in such cases is the installation of compatible equipment. In addition, the practice of operation does not always confirm that analog video surveillance significantly loses to digital cameras. The users themselves rarely complain about the picture quality, distortion or malfunction on the line. It's another matter that in terms of the communication possibilities of pluses, it is more precisely the "figures", but for the majority of consumers the new opportunities are not so significant.
Modern technological solutions were opened foruser a vast range of new functions in a variety of ways. At the same time, there are purely marketing products, the practical value of which is barely perceptible. Partly due to loud advertising and the widespread use of digital cameras, analog surveillance a few years ago has yielded significantly to its positions. The most progressive part of consumers willingly switched to a new format, having received many advantages. At this stage, developers of analog video cameras are trying to revive this segment, since it also has a considerable operational potential.
