Components of a CCTV System

The camera is the front end of the entire WiFi closed-circuit television monitoring system with two-way audio, and its image quality directly determines the image quality of the entire system. There are several types of cameras: intelligent fixed cameras with infrared night vision, intelligent WiFi zoom cameras, PTZ ball cameras, integrated ball cameras and gun cameras. Fixed cameras are generally used in areas with a small monitoring range; zoom cameras are used in areas where the viewing angle of the monitored target needs to be changed and the viewing angle range is large. WiFi security cameras with batteries are divided into two types: wireless integrated cameras and gun cameras with PTZ. The intelligent PTZ ball camera is a new type of camera system that integrates CCD cameras, zoom lenses, omnidirectional pan/tilts and decoders. In terms of performance, it realizes high-speed stepless speed movement of the pan/tilt, precise preset of lens zoom and aperture. , programmed multi-preset settings, and even focus function during movement, so that the home WiFi camera system has automatic inspection and partial automatic tracking functions, transforming from a simple functional type to an intelligent type. The gun-type camera with a pan-tilt is composed of a camera, a zoom lens, a pan-tilt, a decoder, a protective cover, and a bracket. Its main features are a large and wide monitoring range, fast zoom speed, and truly no blind spots in monitoring.

The pan-tilt is divided into a constant speed pan-tilt and a DC variable speed pan-tilt. The constant speed pan-tilt rotates slowly, the horizontal rotation speed is generally 6 ° / second, and the vertical rotation speed is generally 3 ° / second; the DC variable speed pan-tilt rotates faster, such as the British Molinks pan-tilt, which is the fastest pan-tilt on the market, generally with a horizontal rotation speed of 48 ° / second and a vertical rotation speed of 24 ° / second. The decoder is divided into an AC decoder and a DC decoder, which can control the rotation of the pan-tilt, the zoom and focus of the lens, and can also control the pan-tilt and lens that support the preset function. Protective covers are divided into indoor protective covers and outdoor protective covers. The British Molinks protective covers have a higher protection level, generally IP66 standard. Its outstanding dustproof, anti-corrosion and waterproof functions are particularly suitable for use in harsh outdoor environments. Transmission system: refers to the transmission network connecting the front-end and back-end devices.

The transmission medium is generally composed of cables (power cords, video cables, control cables) and optical fibers. The transmission equipment consists of optical terminals and video codecs. Optical terminals are divided into single-mode optical terminals and multi-mode optical terminals, analog optical terminals and digital optical terminals. Video codecs can transmit video signals and control signals, and are generally used for long-distance network transmission. Back-end equipment: mainly composed of control equipment, display equipment, recording equipment and peripheral equipment. The control equipment is a matrix control host, a control keyboard, a multimedia computer, etc.; the display equipment is a monitor; the video equipment is a time-lapse recorder, a hard disk recorder, etc.; the peripheral equipment is a multi-screen splitter, a video distributor, etc. The main function of the back-end equipment is to process, control, display and record the signals collected by the front end.