The security monitoring system is one of the major subsystems in the security technology prevention system. The formulation of this specification is to adapt to the actual needs of safety and prevention projects, in order to improve the quality of engineering design, to provide a national uniform, more scientific and reasonable design specifications for the design of security monitoring system for the majority of engineering design personnel, but also for the intermediary service agencies and government supervision The management department provides the technical basis for program demonstration, system evaluation and supervision and inspection.
The composition of the security monitoring system consists of:
The security monitoring system is generally composed of four main parts: front-end, transmission, control and display recording. The front-end part includes one or more cameras and associated lenses, heads, shields, decoding drivers, etc.; the transmission part includes cables and/or optical cables, and possible wired/wireless signal modulation and demodulation equipment, etc.; control part It mainly includes video switchers, PTZ camera controllers, keyboards, control communication interfaces, power supplies, and consoles and monitor cabinets. The display and recording devices mainly include monitors, video recorders, and multi-screen splitters.
Front-end part: The front end completes the shooting of analog video, the generation of detector alarm signals, the control of the pan/tilt, the protective cover, and the alarm output. These security applications mainly include: cameras, electric zoom lens, outdoor infrared detectors, dual detectors, temperature and humidity sensors, head, protective cover, decoders, lights, siren and other equipment (equipment usage according to the user's Actual demand configuration). The camera uses the built-in CCD and the auxiliary circuit to shoot the scene as an analog video signal, which is transmitted via the coaxial cable. The power zoom lens zooms in and out of the shooting scene, and realizes optical adjustment such as aperture and focus adjustment. Temperature and humidity sensors can detect the temperature and humidity in the environment to ensure a good internal physical environment. PTZ, protective cover provides a suitable working environment for the camera and lens, and can achieve horizontal and vertical adjustment of the shooting angle. Decoder is the core equipment of PTZ and lens control. Through it, it can realize the use of computer interface through software control lens and PTZ.
Transmission section: The transmission section introduced here is mainly composed of coaxial cables. The transmission part requires real-time transmission of images captured by the front-end camera. At the same time, it requires transmission with small loss and reliable transmission quality. Images can be clearly displayed in the video control center.
Control section: This section is the core of the security system. It completes the digital acquisition of analog video surveillance signals, MPEG-1 compression, monitoring data recording and retrieval, and hard disk recording. Its core unit is the acquisition and compression unit. Its channel reliability, calculation processing capability, and convenience of video retrieval directly affect the performance of the entire system. The control part is the key part to realize linkage between alarm and video recording.
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