Papers Category:Engineering Papers
- Industrial Design Papers
Post Time:2012-5-10 11:25:00
Paper Keywords: broadcast monitoring center technology solutions of
Abstract: Broadcast improved the quality of people's spiritual life is very important, but the quality of the broadcast depends largely on the quality of monitoring system is especially important because all necessary equipment monitoring system determines the quality of the broadcast, the monitoring center built a monitoring system is its core parts - the monitoring center. monitoring center for large-scale monitoring system is facing some of the common technical issues, this article on how to built a large-scale monitoring systems, control of the broadcast transmitter control of ancillary equipment, the control of the indoor environment (central air conditioning, indoor cycling ventilation, fire alarm, program transmission control and security monitoring technology program to explore, in order to propose the use of methods and solutions to resolve common technical problems at the same time the future development direction of the monitoring center, the outlook on the self-existing knowledge level, I hope that my exposition can play a meaningful role in solving the problem of monitoring center technology.
Broadcast quality depends largely on the monitoring system is good or bad, because the necessary equipment monitoring system determines the quality of the broadcast, is particularly important that the monitoring center, and set up a monitoring system is important to its core parts - Monitoring Center. monitoring center for large-scale monitoring system is facing some of the common technical issues, this article on how to built a large-scale monitoring system in the broadcast transmitter control, control of ancillary equipment, the control of the indoor environment (central air conditioning, indoor circulating ventilation, fire alarm, program transmission control and security monitoring technology program to explore, in order to propose the use of methods and solutions to resolve common technical problems and outlook on the self-existing knowledge level, at the same time, the future development direction of the monitoring center hope that my exposition can play a meaningful role in solving the problem of monitoring center technology.
1, the broadcast transmitter control technology problems and their solutions
1.1 broadcast transmitter control FAQs The broadcast transmitter FAQs major broadcast transmitting stations testing work found.
Frequency interference, interference investigation, jumbled broadcast transmitter site information repository excessive transmit power, residual wave radiation unqualified modulation frequency offset seriously overweight any changes to the station address additional simulcast launch point more common problem.
1.2 broadcast transmitter control solutions to common problems
1.2.1 broadcast transmitter standards as the theoretical basis to do the basic work to solve the problem
FM broadcast industry standards GY/T169-2001 << VHF FM the wide wave transmitter technical requirements and methods of measurement >> and GB/T4311-2000 << UHF FM radio technology specification >> current two The basic standard-depth study to lay the theoretical basis of norms to solve the problem, but the most used stereo FM broadcast transmitter.
1.2.2 contact manufacturers to understand the production process
Correctly and more comprehensive detection performance of the FM broadcast transmitter only master the general detection method is still not enough, because the production technology and manufacturing skills of different broadcast transmitter, therefore, we must better understand the broadcast transmitter structure, production process in order to get the correct detection results during testing, to provide a reliable basis to address broadcast transmitter failure.
1.2.3 FAQs solution suggested
(1) high-frequency radio wave propagation in an area, whether there is good coverage, according to its line-of-sight propagation law, to select the appropriate launch point is the key to the contrary, blindly increasing the transmit power, as well as in the application system comparisons transmit power, are the wrong approach.
Excessive adjustment, (2) excessive applied the audio modulation amplitude of the signal, and the transmitter reference state can lead to large modulation frequency deviation, the most direct result is that the frequency of the effective radiated power level to be sacrificed, followed by this will make the intermodulation products increases, the receiving voice quality as well as frequency radiation level is reduced and adjacent channel encroachment interference, more serious result is that it will directly affect the working life of the transmitter.
(3) on top with a dedicated communication network tend to be excessive residues wave radiation impact with three, four, five-octave harmonic radiation compared them, an octave signal arouse the more than conventional wireless communication channels the cause of the disturbance is due to the frequency of the signal width. (4) radio transmitter of the radio and television industry in the process are required to apply for approval code.
2, the control of the monitoring center equipment
The control center is the core of the whole monitoring system, the functions of the system, such as: the control of the indoor environment (central air conditioning, indoor cycling ventilation, fire alarm, program transmission control, security monitoring various functions and their implementation are rely on the monitoring center of the various devices to achieve control of the control center of the apparatus receives respective terminal transmission equipment transmission such as audio, data, video, temperature, the photosensitive and alarm signal, and then carry out various operations of its received signal, processing and integration, and then issue a command in the form of various system signals to the various functions of the monitoring system of the manipulator.
2.1 program transmission control Program transmission control can be achieved by the screen processor as well as video and audio switcher. Screen processor currently use up to four Quad, of course, on the market there are multi-image processor.
Processor through the four-screen four screen compressed combinations, and then displayed on the same screen, save video equipment, while more intuitive reaction real-time image, and at the same time support the amplification the playback site records and records of the effect have been greatly improve.
Multi-screen processor is a more advanced video image processing device, it can in a shorter time interval of the actual scene monitoring and picture recording, to better reflect the authenticity of the monitoring scene In addition to the features in the aspects of picture processing, It also has a single-screen display, picture-in-picture display any combination of segmentation of multi-screen display image digital zoom, video signal loss detection time occurs the image channel name title editing and alarm processing functions. The video and audio switching equipment mainly refers to the camera connected to VCR or monitor.
Many occasions monitor the work of on-site data collection equipment in the terminal.
Sound through these terminal data image acquisition equipment to monitor the area within the field data transmitted to the monitoring center, after the monitoring center to determine which data image and sound transmission of data storage, and issued the command to achieve control. Mostly through Network radio technology and fiber optic technology to achieve.
Little branch of this system, generally as long as the installation of audio-visual images voice acquisition monitor addition to artificially vandalism, no problems, Of course, if there are large areas of the United States where senior crime, problems are inevitable After all, the machine device is artificially set is inevitable, there is its own defects.
2.2 indoor environmental control
Indoor working environment mainly refers to the heating and ventilation of the indoor environment, and control of the work environment of the control center through the HVAC system control, HVAC system control of the central air-conditioning system, through the collector terminal of the central air-conditioning temperature control at all times monitoring temperature within the region working environment by the terminal temperature and ventilation information feedback to the monitoring center, the monitoring center based on feedback information to issue a command to raise or lower the temperature of the working environment, raise or lower the wind speed.
Also under the control of the general situation of the indoor working environment rarely a problem, in addition to the temperature in the case of fire out of control, the indoor working environment has control center computer automated process control HVAC indoor environment. Posted in the free papers Download Center http:/ / eng.hi138.com 2.3 Fire alarm control
The fire alarm control alarm processor control, The the collection terminal alarm signal alarm processor, then transfer to the control center by the control center of the computer control system to send an alarm signal to notify emergency, allow people to pay attention to safety, seize the time to evacuate security scene. The alarm processor can be divided in accordance with the approach of different bus and multi-line.
Bus alarm processor terminal probe's signal is transmitted to the control center by a two-lane, low cost but complex structure is still a large number of applications, multi-line each terminal probe without interfering signal is transmitted to the control center, free speed signals interfere with each other transmission, but the cost is high.
The alarm processor to collect all the front-end alarm signal, while the the alarm occurred channel signal processing, and outputs a plurality of switch control light, such as a VCR, the device automatically starts, while the output of the alarm channel coded and transmitted to the control center of the master.
The common problem is that the line of the system easy to aging, the transmitted signal interference phenomenon periodic alarm device performance testing solution is to take preventive measures. Can also be self-help training personnel in critical situations.
2.4 security monitoring
Security monitoring systems typically Multimedia Monitoring System, a comprehensive grasp of the whole picture of the monitoring area by electronic chart, but its different systems use different personnel granted permission, be sure to do security work, to prevent the system from being used illegally , causing damage to the system.
Its characteristics are not subject to human control to monitor the area to provide emergency and disaster prevention, and this is done by the a particular computer control program. It also has a flexible design capabilities of the computer module, as well as information network platform , lay the foundation for security monitoring network information.
Its problems is the information interface processing difficulties, computer application technology requirements of the operating personnel stronger sense of responsibility, and respond to emergencies and disasters better qualities of heart, so the staff of the security monitoring system be carefully chosen, after layers of strict examination to posts work.
3, on the outlook for the future monitoring center
The key focus in the discussion of the full text description of the function and work of the various branches of the monitoring center, its common issues raised and given appropriate solution, a general view, all control by the main computer control program interactive control through the man-machine interface, the collection terminal servers and fiber optic cable, and a variety of information aggregators to automate control, and ultimately to achieve the purpose of monitoring.
The monitoring center monitoring system design facing solve computer programming safety of feedback signal the transmitter compatibility and system stability control. RMON main monitoring center in the future direction of development of computer information technology-oriented, network-oriented development. Structured communication between the various monitoring systems through computer programming segments integrated management control, through the network in the twenty the first century of this era of information technology, network and computer technology deep into all areas of life, so future monitoring center at the center of the monitoring system the same like today's computer chips cpu command of the various branches of monitoring system for the people spiritual life to provide quality services, while helping people to understand the current political, so that people's eyes open.
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