【 Weak current College 】 on sports broadcasting systems, closed circuit monitoring system, big-screen display system design

Summary: this article from stadiums starting describes stadiums broadcasting systems, closed circuit monitoring system, big-screen display system design, information only
Keywords: big space burst sites noise sound field compensation as modern introduction: social life pace, the rapid development of science and technology, as well as the importance of the environment, people's stadium weak electricity system design requires more user-friendly and convenient. This article focuses on weak electricity system emergency broadcast system, site sound reinforcement systems, closed circuit monitoring system, big-screen display system. Would like for your reference. Emergency/public broadcasting system 1.1 needs analysis of emergency/gymnasium public broadcasting requirements and general building, roughly similar to demand, there is still a particularity, the design of the emergency broadcast system and gymnasium, it should be noted that the question is how the Auditorium and venues for effective compensation of noise.　　At the venue, the Auditorium, distributed offices and other places set noise detector, and the corresponding audio compensation. Emergency/public broadcasting function is usually available for business radio, emergency situations be used as an emergency broadcast priority utilization. In perfect voice alarm devices at the same time, improve emergency operations; adapt stadiums and other large buildings needs up line, a timely response to all of the sites, enhance emergency grooming is security.　　1.2 system overview ◎ emergency broadcasting system traditional alarm bell to ease the present staff (staff, athletes, spectators, VIP seats, etc.), while the system is able to adopt detailed voice broadcast clearly on any single location venues for broadcasting. In the Museum all personnel informed emergency occurs and grooming at the same time, also be able to accurately grasp the fire place and situation. ◎ Broadcast management system directed at specific places and regional broadcasting. By storing the game used in the BGM and broadcast content, the ability to automatically acquire information such as date and week. Through the regional play different music, creating a more pleasant environment. ◎ Emergency grooming system in the event of fire, monitor master site. In the central management a real-time understanding of the situation, to take appropriate countermeasures in a timely manner. Can monitor to confirm safe evacuation route, quickly relieve the Museum staff. ◎ Distributed topology based on the functional area of distribution, placing the amplifier, reducing wiring distributed costs, reduce and control center power load, easy to maintain management through digital audio network transmission audio signal transmission distance by reducing power to reduce audio power attenuation 1.3 design method of the engineering design process 1.3.1 broadcasting 1.3.2 design principles ◎ speakers distribution ceiling height speaker interval 1 speaker cover 2.5 m 3 m approximately 9 square meters 3.O m 4 m ~ 16 m 3.5 m S m approximately 25 square meters, about 6 m 4.O m 36 m S.0 m 8 m about 64 square meters in a ceiling suspended ceiling, use of indoor, non-embedded in the back cover of the ceiling speakers in the ceiling of the room (such as the underground car park), on the other hand, to choose wall mount speakers or audio column in outdoor, waterproof speakers or use Horn. These speakers are not only a waterproof function, and volume. In the community, the Botanical Garden, lawn, lawn speaker to choose. This type of speaker waterproof, beautiful, and the volume and sound quality are fastidious in decoration elegant, ceiling high wide Hall, use elegant, tonal harmony of hoisting-and-speakers in the fire safety requirements for high occasions, use fire-speakers.　　These speakers are sealed type, its outlet port matching with flame retardant casing. Radio speakers are usually distributed configuration, the broadcast coverage of the sound pressure, can be approximated as a single radio speakers. According to the theory of electro-acoustics, speaker covering area of the sound pressure level of sensitivity SPL with speakers-Lm, fed to speakers power P, listening points and speaker distance, and so has the following relation: SPL = Lm + 10 k dB p-20 lg r (1) it can be concluded that the distance each doubles, sound pressure level decreases 6db, in stadiums broadcast design to take into account the volume and sound pressure. ◎ Circuit quantities determine floors emergency broadcasting press on the same floor where the dividing line, the fire region different intervals, elevators, staircases, outdoor can be used as a separate circuit Setup. On the same floor of the circuit can be divided in accordance with the functional area further input audio select by ◎ needs to configure the mixer, noise detector, radio microphones, emergency operational unit ◎ amplifier configurations calculating power amplifier configuration broadcast power amplifier of the most important parameter is the rated output power. Should use the rated output power, subject to the total power of the radio speakers. The broadcasting system, as long as broadcast speaker power less than or equal to the amplifier's rated power and voltage parameters are the same, you can feel free to adapt, but considering the line loss, aging and other factors, should be appropriate to leave power.　　According to the "standard" requirements, the amplifier's volume (corresponding to the rated output power) should generally be anxiashijisuan: P = K1 xK2x ∑ P0 (2) P-amplifier device output total power (w) P0-each loop (equivalent to partition) at maximum power when broadcasting P0 = Ki ~ PiP1 – I partition speakers rated capacity Ki – I also want partition coefficient: service broadcasting room programs, take 0.2 — 0.4 background music system, take O.5 ~ 0.6 business of broadcasting, 0.7-0.8 fire broadcasting, 1.0K1 — line attenuation compensation coefficient: 1.26-1.58K2 — aging coefficient: 1.2 ~ 1.4 spare amplifier calculated if the background music system, broadcasting amplifier's rated output power shall be speakers total power of 1.3 times. All of the public broadcasting system in principle should be can't disasters emergency broadcast, as a result, the system shall be provided with emergency radio power amplifier. According to the "standard" requirements, emergency broadcasting amplifier's rated output power shall be broadcast speaker largest three partition speaker volume totals 1.5 times. ◎ Partition, select one of the public broadcasting system is often divided into several areas, the managers (or pre-programming) decide which area shall publish broadcast, those regions to suspend the broadcasts, the region shall beInsert the emergency broadcast, etc. In principle, the partition scheme depends on the customer's needs. Usually refer to the following rules: 1, stadiums usually stand partition, VIP seating partitions, manage partitions. 2, stadium management departments and establishments of public places, athletes should be located.　　3. important departments or broadcast speaker volume need to be adjusted in the field should be set up individually. In General, the partitioning is designed for easy management. Anyone who needs to be treated separately in part, should be split into different areas. However, each region, the total power of the radio speakers should not be too large to be with the audio matrix and amplifiers of capacity. 1.4 broadcasting system configuration diagram 2 site amplification system 2.1 needs analysis, large-scale construction than General Gymnasium has a unique, Super extra large space and architecture of diversity determines distinctiveness gymnasium weak electricity system.　　This article focuses on the characteristics of its diversity and space to discuss site sound reinforcement system design principles, and so on several issues. Since the stadium's 24 x 7 x 365, multi-purpose characteristics. Need site amplification system provides the flexibility required for different purposes, such as the opening ceremony, sports competitions, concerts, theatrical performances, concerts, exhibitions and other different situations, as well as their different audience capacity, flow changes.　　And called on various occasions in the context both high-definition broadcast and high-fidelity music effects. This article draws on the Osaka Stadium sound reinforcement system of venues, venue for sound reinforcement systems, related description. 2.2 system overview Osaka stadium is to host baseball-various sports, a variety of concerts to exhibitions, gymnasium diameter 202m, high 72m, volume 120 000 m2, Max hold 55,000, multifunctional, located in Japan Kansai Urban circle of mass sports facilities. Based on the IRC multi-purpose, big space, the stadium sound reinforcement system of venues chosen Panasonic RAMSA audio system.　　2.2.1 system device configuration in six audio dimming room set audio adjustment table, Mac support, sound field support frame, etc., in the left and right sides of power amplifier room configuration is used for sound field compensation balancer and PA Group, digital multi-function balancer, range controller, digital audio processor, 114-amplifier and other devices over a network audio dimming room for centralized control.　　Speaker system is located in the center of the center speaker gymnasium, Auditorium and upper secondary radio speakers, upper balcony of the speakers, 6 to 8 layers around the stadium's VIP room (VIP seats) speakers. Osaka Stadium's greatest features is based on a variety of functional activity needs, change the height of the ceiling, roof lifting system which ring. And, through the ceiling of lifting can freely control the brightness of the light inside, such as sports events and so on needs to open natural outdoor sports, concerts, etc. require full shade. In order to adapt to the ceiling of the lifting of changes, such as the number of seating, temporary change of the swimming pool, sports ground segmentation partition wall location changes, and audio systems with compatible with competition requirements of preset functions, is very necessary. Not only to meet the sports games requires a clear broadcast sound, concerts by speaker sound reinforcement, but also takes into account a wide range of music of audio features. 2.2.2 system features adopts the integrated computer-controlled audio system designed to meet the spatial variability of a stadium environment characteristics, play the best suitable for a variety of activities, in stereo sound control Center PC Terminal color display, you can easily set up in compliance with the ceiling height and basic use of the area covered by the speakers, sound pressure level, delay time, the balancer and other parameter values. In addition, in order to be able to better meet the requirements of sound at the time, a more detailed set of parameters, you can set several different models of management, the maximum you can set a campaign 999. Network by adopting RAMSA-LAN (adjustment of the Interior) and RAMSA-NET (adjust the room a power amplifier room), capable of achieving system scalability and speed.　　◎ Mode preset function to graphically display the sports competitions, concerts, etc. all with State of the stadium speaker ON/OFF display a field activity can set 10 mode, maximum setting 999 field activities on settings in the power of digital multifunction data processors for remote speaker group status detection network and device status detection (self diagnosis function) to a power outage and abnormal sound alert alarm function of centralized and decentralized speakers and speaker, natural voice sense of direction and sound pressure is distributed. Because the concentration of speakers (Centre speaker group) and dispersion speakers (Secondary/6 cabin next/VIP room) and, as the sound source to the audience's voice delay arising from different phenomenon, in order to eliminate the delay in adopting digital site amplification system, audio processors for different regions for the corresponding parameter is set to achieve the balance of the sound, the sound of homogenization, and amplifying timing control. By delaying parameter settings (group than Center speaker, Auditorium near auxiliary speaker and second floor balcony of speakers, by setting its based on distance difference delay compensation parameters) to ensure uniform distribution of the sound pressure. The audience can feel the Central speaker group and assisted natural dispersion speakers and unique sound effects.　　Back from the Auditorium sound field support system control reflection sound, residual tone. Stadium Auditorium is divided into upper and lower layer theatre-style seating. Because the upper seats of the front roof eaves blocks from sources of reflective tone, so lower seats of audience hearing is not optimal. To avoid this situation, the use of digital range controller from the ceiling of the first reflection sound and residual tone in the balcony of your speakers on and then construct a sound field support, and realize the balcony with the balcony outside sound field and sound of natural law. Auditorium rear sound field support frame and other audio dimming interior of audio equipment sound adjustment table WR-SX1A and sound CPU underframe, power increases with professional sound system mixer audio dimming room single use is equipped with 24 circuit, stereo 4 circuit input, output, 2 20 loop circuit and matrix 10 circuit output mixer. And equipped with 12 loop transportation person of the mixer, CD player and audio removable temporary transferYintai, can meet the audio requirements of events or performances and other activities. In order to achieve greater spatial sound reinforcement, using a low-impedance transmission mode. General site amplification system with amplifier and speaker high impedance connections, Osaka Stadium in order to avoid signal attenuation caused by the deterioration in the actual sound, using a low-impedance transmission. Use low attenuation of transmission cables, and minimize the amplifier and the distance between the speakers, to achieve high quality playback. 3 closed circuit monitoring system 3.1 needs analysis Stadium from the architectural point of view, the space is very large, integrated complex. Perfect function; from a security perspective, because the concentration of sporting events, staff will suddenly increase the traffic to a cross, for security monitoring system, how to limit the flow of people, avoid emergencies, become an important note; but in no event will the period, personnel flow almost to zero.　　Therefore, the stadiums of the CCTV system set must satisfy the General security standards, but also flexibility, year, reliability characteristics.　　Seat audio compensation system schematic with electronic technology, the growing development of the network traffic, the expansion of the network bandwidth, video network transmission reliability and more network monitoring system is based entirely on computer networks to its core, combined with the security monitoring actual requirements and for many years and constantly improve security theory and experience using the latest digital video technology, fieldbus technology, network communication technology to establish a set of software and hardware integration, brand new, complete security system, optimized internal structure, reduce unnecessary links, improve overall performance and responsiveness, meet new technology evolving needs, and provide the user with a comprehensive range of value-added services, will monitor from security to the management of height, this is the future direction of development of monitoring systems. Closed circuit monitoring system to monitor population sports stadium, the personnel monitoring, congestion, venue Center status, with or without emergency patients or suspicious persons, equipment, machinery and work status, due to the demand of outdoor stadiums, require camera have even at night, outdoor, darkened areas can monitor suspicious character of ultra-high sensitivity. Monitoring system at the same time helping stadiums events security operations, effective management tools, you need to have strong management capabilities, sophisticated software and hardware support. 3.2 system overview monitoring network camera directly to the video image signals directly converted to a digital network signals, and through the network interface is passed to the video server, and monitoring and management needs to record the image to the video data server, and through communication server and wide area networks or specific is connected to a network, implement remote image calls, monitoring features. In the monitoring center of video server can monitor multiple network remote audio and video image and security information, and can control the front of the head; monitoring video server can record alarm occurs, the front of the image, and can be networked remote storage through networked storage to storage devices, such as fire hosts, security hosts, etc. ◎ A capacity redundant video network transport system takes full advantage of broadband network resources, and in the bandwidth reserved for redundant bandwidth to accommodate sudden flow of reliable, advanced network hardware device, including communications servers, data servers, switches and other equipment Super function of management software, can be combined with the management of sports facilities, and to the public security sector reserved private interface ◎ camera design Super sensitivity through the use of hyper-sensitivity design, even in the sunset or indoor light Dim places can make color monitor. In light of lower case will automatically switch from color to black and white, thereby enhancing sensitivity, 24-hour monitoring. ◎ Monitoring system with rich functionality for large image contrast illumination, through digital processing, respectively, read, and dim light too light led screen white unrecognized image, made into a site of any of the parts are easy to distinguish between natural images. Auto-sensing of dynamic and static monitoring picture and alarm signal output to the system, so no one can ingest into areas of suspicious persons, etc. Through the use of flip with built-in digital (★ reverse) function models, continuous tracking just below from the camera through the past. Have the ability to record elevation as-is, zoom, etc. prior to manual operation of the camera operation, and then to reproduce their operations single touch. ◎ High durability used to waterproof outdoor installation by design drip and strong material impact resistance and, therefore, has the extremely high durability. Adopt the high reliability of electronic components manufacturing equipment ◎ CCTV wiring design due to the use of network solutions, the wiring is simple, only need all you may need to set the location of the control point for the network interface, you can race is held, the sudden flow, free to install. Easy to create and expand, implement system rationally 3.3 system design method 3.3.1 design principles ¡ò practical: to the actual situation at the scene selection of equipment to less cost gets to use ◎ advanced technology: front-end and dual-purpose type camera suitable for daytime and night-time surveillance, control system uses video network matrix system to facilitate the control of prospective: that is, design programs not only to consider the needs of now needs to take into account the need to develop, with strong applicability and can protect the applicability of filling: System @ hardware design for management staff and security personnel, requirements for operation and easy to use intuitive and convenient, easy to learn. With Chinese characters.　　3.3.2 design methods 1. under the system functional requirements, determine the system component and device configuration and gymnasium functions, events, cultural activities, emergency personnel flow occurs, video monitoring system workload, a large amount of information, however, in a non-competition period of relatively few people flow, therefore, in the system design time, the first thing to note is the system scalability and redundancy of the system of communication, thus ensuring the stability of the system. Use network monitoring systems, system design with ease of extensibility, a closed circuit monitoring of large-capacity, high-rate monitoring backbone network (Gigabit Ethernet), especially suited to the characteristics of the monitoring system and gymnasium.　　During peacetime, personnel, just for general monitoring, during the events, activities, equipped with mobile devices, mobile managers on closed circuit monitoring system for effective management. With the development of intelligent neurons, LEONGTo monitor the application of a reduced workload, motion detection, mobile tracking, object recognition, biometric technology in closed circuit monitoring system, the implementation of the integrated application of intelligent monitoring capabilities. At the same time, provides a common interface implementation and BA, CA, fire-fighting system and other weak electricity system linkage. II. According to the sports complex architectural plan and actual demand, determining camera, monitoring point location and selection of special architectural structure of sports facilities, subject to compliance with the civil monitor TV closed-system code, you also need to pay attention there: on camera points for reasonable layout, common area, equipment monitoring, no dead ends. According to the monitoring area and scenery, clear main perturbation, Deputy photo taken, will focus on macroeconomic surveillance and monitoring, taking into account the camera angle and PTZ camera settings. Monitor target illumination camera minimum illumination requirement (F/1.4) ≤ 50 h Ⅸ 1 Lux50.,, 100 Lux ≥ 100 Lux3 Lux5 Lux installation height: indoor distributing Office etc to 2.5 ~ 5m, outdoor sports, outdoor and indoor venues high Hall to 3.5--10m suitable. Depending on the illumination, choosing the right camcorder camera under target, select the environment against the Super dynamic III. According to color camera camera distribution and environmental conditions, the configuration of the transport and routing backbone, CCTV video transmission characteristics, network bandwidth requirements are higher, and requires use of highly redundant network system, so the use of Gigabit Ethernet or over the network, the camera uses the graphics transmission system, easy to scale, easy-to-Ethernet cabling, it is recommended that you monitor the subnet with 10/100 m Ethernet, to save cost IV. choosing the video server, complete the monitoring matrix functions, including logging, monitoring, and other functions; macroeconomic dynamic monitoring, motion detection, mobile storage, alarm linkage, and alarm recording functions; micro-computer forensics, video files, key logging, log file is not changed; set video data server, on a large number of video recording file is effectively managed; 3.4 system configuration diagram 4 big-screen display system 4.1 needs analysis in sports facilities, large-screen display is the main sports complex information display. Led display is the use of light-emitting diode consists of a dot matrix module or the pixel modules in the area of the display screen, possess high reliability, high brightness, full color, long life, strong environmental adaptability, price-performance ratio is high, the use of low cost. This article on the ASTROVISION, for example, discuss the led display system design. 4.2 system overview 4.2.1 design principles ◎ angle design ASTROVISION LEl20Z level perspective is 130 degrees. In the stadium's perspective covering most of the Auditorium, in the opposite direction of the stadium to establish two pieces of the same size of the display can cover the audience, so the audience can see the display screen. ◎-Sight design recent discernible range as 9 m. The following figure for Visual range of calculation method: maximum distance to the screen in theory about screen height * 30. If the display height 7.68 m, then the most far-sight 7.68 ~ 30 = 230.4 m. Fully meet the requirements of the distance to the National Stadium. ◎ Race timing score display of a clock and video performance meter partition. 4.2.2 system architecture system display section includes screen, speakers, screens, screen controller, content player functionality is implemented by the computer, the display shows the content is controlled by the computer software. Through the network, external transmission, content manager, display the editor, data acquisition equipment and other direct will display content to the content of the player (data) or screen controller (video) for playback control. Color cameras and VTR equipment for large screen display video source, the video signal by nonlinear editing. Synthetic image directly through the network, or through the content manager to show a unified control and transmission control. 4.3 system configuration diagram