preface

As scientific and technological progress and economic development has brought the entire social improvement of living standards, people's life is no longer limited to traditional food, clothing, shelter, line, the surrounding living environment and environmental security is more and more attention, security technology to prevent as an important tool to protect people's lives and property is becoming more and more by broad consumer attention.

Closed-circuit television monitoring system as the safety system to prevent and manage the most basic, the most important visual tools which has been widely used and development. The practice proved closed-circuit monitoring of a variety of technical prevention system of is the most effective measures to prevent and stop the crime.

In the field of security, closed-circuit television monitoring system is very important (CCTVSYSTEM), it can promptly transmit activity image information. On duty personnel through the control device, can control the front camera, change the camera Angle, azimuth and the lens focal length, etc. To achieve a wide range of on site observation and close feature, and can through the video equipment records forensics.

The first part of system design goal

1, the design idea

Residential CCTV closed-circuit television monitoring system for village (public area and gateway). Closed-circuit television monitoring to the community

System is the entrance to the village, the main place entrances, residential area, the monitoring at various points within the scope of outdoor also can be used as the internal management. In view of the actual situation of this system, set up a master control center and other administrative departments at all levels can be realized through the network control functions.

2, the system is

We can design system to the surrounding area of the village, village entrances, and other important places to monitor and video. This system based on embedded digital hard disk video recorder and video matrix main equipment, control and alarm linkage to realize multipoint video matrix system management more levels.

The design consideration, from the perspective of the optimal ratio of peripheral devices using SONY chip system, implementation system optimization combination, the connection of science, all-round to important positions. To achieve the function is all ready, clear image, master control room can observe each field of point to point, monitoring area of the entire video, replays clearly. Based on the principle of practical, economical and reliable, which fully reflects the modern electronic technology, modern communication technology, modern control technology and the perfect combination of modern computer technology.

This system characteristic is that it adopts the frequency division multiplexing, digital modulation, CATV mature technologies such as image, voice, control, alarm set at a suit, has realized the image acquisition, transmission, monitoring, recording and management of monitoring system. The system for the bus network structure, construction simple wiring, shorten the construction cycle, improve the reliability of the system, solves the area scattered point to point and monitoring points, the transmission distance is far more difficult problem.

The second part of the system design principle, basis

1, the design basis

This design according to party a's general requirements, and follow the national related department to make the design specification requirements.

2, the principle of design

This design by industry standard as a design basis, in combination with the specific situation of the community, in line with reasonable structure, safe and reliable, the mainstream products, low cost, low maintenance as a starting point, and in this for your company to provide advanced, safe, reliable and efficient system solutions. Because this system is a comprehensive system strictly, in system design and construction process should refer to all aspects of the standard and specification, strictly comply with the technical regulations, the standardization of system design and construction.

The third part of the system design

Type 1, camera pause

Camera is the "eyes" of the whole system to monitor the content into image signal, image clarity, camera Angle, especially the night effect, and so on, affect the quality of the whole system. We are from different environmental design different camera to achieve the best effect of monitoring. Selection should be according to the site environment and user needs, choose carefully.

According to our experience can be concluded that community perimeter monitoring for choose gun camera, fixed monitoring scope, the problems and weak light at night, you will need to configure infrared camera; Important entrances and exits, because of the large cross area is wide, suitable for choose integrated camera, with spherical yuntai, can monitor the broader scope; The door of the unit area is small, but the key monitoring area, be sure to choose high definition, double CCD infrared camera, ensure 24 hours, clear monitoring and recording; Elevator monitoring scope, now wants to choose fisheye wide-angle camera, monitored by guarantee to the entire area of the elevator; Recreational area is the most difficult to solve the problem of monitoring at night, because the green space, the surface of the water, the infrared camera in these areas out of their night vision function, and so require additional light source, configuration can turn color black low illumination cameras, heavy-duty outdoor haeundae configuration can more suitable for the outdoor environment, the most important thing is can convenient combination light source. All in all, no one is universal camera, suitable for all circumstances, we must choose suitable camera according to the specific environment, to better meet the requirements of our monitor.

2, the transmission system design

Television monitoring system, usually in accordance with the function is divided into the front parts, transmission parts and control parts, the front end of the transmission system will monitor system equipment and associated terminal equipment of the physical channel. Images produced by the front-end equipment, all kinds of signals, sound signal

Alarm signal through the transmission system is transmitted to the control center, and to control commands sent to the control center of the front end equipment.

System engineering, good video transmission part of the design are very important to monitor and control system. If all selected is the front end of the high performance, high quality and the main control device, but there's not a good transmission system, finally on the monitors will not be able to see the image is satisfactory. According to the "bucket law," the final image quality will depend on the worst part of the whole system. System design and installation personnel must according to the actual need to choose the right means of transmission, the high quality transmission cable, connector and equipment, and installation in accordance with professional standards, to achieve the ideal effect of transmission.

JY2000 series cable monitoring system: video data using amplitude modulation, audio frequency modulation carry, FSK modulation signal modulation techniques, such as the number 20 road monitoring image, audio, control, broadcasting and alarm signals are integrated into the "a" in the coaxial cable of the two-way transmission. Its advantage is: make full use of the resources of the coaxial cable of the space, 20 audio and video and control signals in the same cable bidirectional transmission, realize "one line" in common cable syetem; Simple construction, convenient maintenance, a large number of save the cost of materials and construction cost; Frequency division multiplexing technology to solve the distance transmission point spread, wiring difficult monitoring transmission problem; Mode of rf transmission attenuation only carrier signal, image signal attenuation is very small, luminance and chrominance transmission synchronization nested, ensure that image quality meet the national standards; Using 75 Ω coaxial non-equilibrium transport has the very strong anti-jamming capability, electromagnetic environment complex situations still can guarantee the quality of the image.

3, central control and management system

In the control room, novel fashion, practical, stable performance