What is CCTV

1) What is a closed circuit TV system 

A closed circuit system (CCTV) is a television system that operates on the basis of a private memo signal distribution in “closed loop” …
Unlike radio or television, which are available to anyone with a suitable receiver (Radio or TV), CCTV images are available only to those directly connected to the circuit or who, from the outside, have appropriate authorizations to access it.What is CCTV
2) When and where to apply
Security and surveillance are the most common applications for CCTV systems. With the use of these systems enables the security officer to oversee the affected areas while maximizing the efficiency with the certainty that no potentially dangerous event gets out of control.
3) Camera selection
The camera is the “eye” of a CCTV system and at its heart lies the CCD technology.
The human eye and the camera lenses operate on completely different lines.
The human eye adapts to different lighting conditions, the camera is inherently less flexible for this reason, the design of a CCTV system should be accurate and targeted to the environment in which it will be installed.What is CCTV 1

4) Choosing the correct optical
The quality of the lenses is vital in determining the quality of the final image.
The optical characteristics of a lens are: the focal length, aperture and the motorisation of zoom and focus.
5) Types of monitors and their use
An operator to control in a room may be required to view images from multiple monitors for prolonged periods. Since the effectiveness of the monitoring system depends crucially on the degree of attention of the operator and his State of tiredness, a correct monitor selection is vital.
6) Transmission of video signals
A CCTV signal contains a wide range of frequencies, from about 30 Hz to about 10 MHz.
Consequently, you require circuits capable of coping with the bandwidth required if you want to preserve signal quality during transmission.
Various adapters allow you to transmit video and audio signals when required, over coax, fiber or twisted, wirelessly.What is CCTV 2
7) Video switching and multiplexing
If a system consists of a single camera and a monitor, the switching system is not necessary.
It would not of course practical or desirable in a multichambered system have a monitor for each camera.
In these cases, a switching system will allow the video to be seen on a screen only (analog or PC) while coming from any number of cameras.
8) Dmv CCTV control systems
While most cameras are installed in a fixed position, allowing the operator to follow an event, it may be useful to have the ability to traverse the camera itself; the control can take place by means of a dedicated console or via PC.
9) Recording video control arrays and alarms
The purpose of the surveillance systems is being constantly monitored, but these are the minority. The majority of systems not being continuously monitored requires registration systems.What is CCTV 3

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