Weak current College】 【public broadcast system design and specification-Power By】 【China power house network.

<br> 1. the public broadcasting system design ideas: <br> <br> In strict accordance with People's Republic of China Ministry of public security fire alarm system design specifications (excerpt) (GB50116-98) as the design basis, combined with .your needs, use the best designs reflect the highest cost performance, so that the system functions and indicators and achieves the domestic advanced with the type system, are our overall design concept. Embodied in the following areas: <br> <br> A) .nature and scalability: <br> <br> The development of modern information technology, new products, new technologies are constantly evolving. Therefore this system in investment costs permits should make full use of modern technologies in order to make the system in short time as .possible and adapted to social development. But because of the rapid development of modern science and technology, they must take full account of the future development needs, design programmes must have a forward-looking and scalability. This extensibility is not only the full protection of .the party's investment and a fairly high performance-price ratio. This design on this are fully considered, embedded the necessary pipeline, reserved various interface, very easy to extend and upgrade of the system. <br> <br> B) scientific and normative .: <br> <br> Public broadcasting system and the General sound system, is a sophisticated integrated systems engineering, starting from the system design is necessary, including the construction, installation, debugging, until final acceptance of the whole process, are in strict .accordance with national standards and norms, do a system of standardized design and science of management. Last submitted formal testing and inspection reports and complete construction drawings and technical data for the Party of the archive. Special projects as government funding, must ensure that the entire .project can withstand various aspects and for a longer time severely tested. <br> <br> Implementation of major specification includes: <br> <br> SGB50116-98 the automatic fire alarm system design specifications (excerpt) "<br> <br .> SGJG/T16-92 the civil construction electrical design code <br> <br> SGB/T50314-2000 intelligent building design standards "<br> <br> C) security and reliability: <br> <br> The construction of the .public broadcasting system, and directly affect user performance, external image and return on investment, so the system must be secure, reliable, this programme has already been fully considered mature technology and products, in equipment selection and system design to minimize failure. And from .the line laying, equipment installation, commissioning and personnel training of party, etc, will meet the requirements of reliability. Particularly important that the programme selection of all major key equipment made the device manufacturers or agents of authorized certification and undertook engineering equipment, technical support .and after-sales service, giving full support. (To be paid on the certificate) is the international and domestic engineering bidding projects focused on the examination of one of the key conditions. <br> Third, public broadcasting system design requirements <br> .<br> We at design public broadcasting projects, strictly follow the tender on public / fire broadcasting project various venues of specific technical requirements, taking into account relevant national standards, the according field of acoustics of the actual situation and the use of functional requirements, .public / fire broadcasting system design and device configuration, the system design technology standards, equipment standard specifications, engineering standards fully in line with the relevant national legislation and norms. Design is based on the owner's request, drawing on the current domestic fire protection system of .advanced technology, designed as a set of advanced equipment, elegant, and beautiful sound quality, functional, modern background / emergency broadcast system. The configuration of main equipment selection of brand-name products to ensure excellent performance indicators, and auxiliary equipment is imported or .domestic reliable brand to appropriate cost reduction. Use our public broadcasting's design and construction for years of theoretical and practical experience, and carefully mix combinations to ensure that the performance is outstanding, reliable quality. Design principles are as follows: <br> <br> .A) transmission method: <br> <br> Broadcasting system used cable pressure transmission, transmission voltage 70V or 100V. <br> <br> B) on line attenuation requirements: <br> <br> In the public broadcasting system, from .the output of the amplifier unit to line up of speakers of the line between user attenuation should meet the following requirements: <br> <br> B.1 using fixed output voltage, output voltage feeder lines using 70V or 100V. <br> < .br> Power amplifiers of capacity calculation method: <br> <br> The business of broadcasting systems and operations of the broadcasting system of calculation method: P = K 1 × K 2 × Σ P o <br> <br> Type: P .- power amplifier output total power (W); <br> <br> Po - Ki × Pi, each tap at maximum power when broadcasting (W); <br> <br> Pi - I tap on user devices rated .capacity; <br> <br> Ki - I tap while need coefficient; <br> <br> Service broadcasting, the rooms show each Ki of 0.2-0.4; <br> <br> Background music by 0.7-0.8 Ki < .br> <br> K1 - line attenuation compensation coefficient line attenuation while taking 1.26 1dB; line attenuation 2dB from 1.58; when <br> <br> K2 - aging factor, generally take 1.2-1.4; <br> <br> .B.2 power amplifier capacity on the system speaker 1.5 times. <br> <br> C) speaker settings <br> <br> C.1 can adapt to the needs of different environments, and the volume and audio quality are very high .. <br> <br> C.2 radio speakers, in principle, to the principle of uniform, dispersed in broadcasting service area. Its decentralized level should ensure that the service area of signal to noise ratio is not less than 15dB. <br .> <br> D) broadcasting systems of power supply requirements <br> <br> D.1 small-capacity radio can supply power directly from the socket; capacity above the 500W, sets the broadcast control room, its power can beFrom the nearest .power controller-dedicated power supply. <br> <br> D.2 AC voltage offset value is greater than + General 10%, when the voltage offset does not meet the requirements of the device limitations, should <br> <br> Equipment .for automatic voltage regulator unit in the vicinity. <br> <br> D.3 broadcasting AC power supply capacity is generally final broadcasting equipment AC power consumption capacity 1.5-2 times. <br> <br> Transmission cable choice <br> < .br> D.4 broadcasting channels use copper conductor stranded wire plastic. <br> <br> The signal line D.5 variety should be shielded cable. <br> <br> E) line of laying <br> <br> Line .used to wear steel pipe or cable laying, and lighting, power line and cable laying. <br> <br> F) public / fire broadcast design specifications: <br> <br> (People's Republic of China Ministry of public security fire alarm .system design specifications (excerpt) (GB50116-98) 1 June 1999) <br> <br> F.1 Control Center alarm system should be set fire emergency broadcast, central alarm system should set fire emergency broadcast. <br> <br> .F.2 fire emergency broadcast speaker setting, should meet the following requirements: <br> <br> A, civil construction in the speakers should be set in the corridors and halls and other public field. Each speaker rating should not be less than 3W ., its amount should guarantee from a fire protection district of any part of the recent one speaker distance not greater than 25m. The last speaker in the aisle to aisle end distance should not be greater than 12.5m. <br> <br> B, .the ambient noise settings greater than 60 places, in which the speaker playback range up to burst pressure level should be higher than the on-demand in the background noise of 15. <br> <br> F.3 fire emergency broadcasting and public broadcasting .and should meet the following requirements: <br> <br> A, fires should be able to fire control room will fire evacuation level for the speakers and to public broadcasting amplifiers force fire emergency broadcast status. <br> <br> B, fire .control rooms should be monitored for fire emergency broadcast of amplifiers for operation and should be opened with remote control and microphone audio amplifiers. <br> <br> C, should set fire emergency broadcast alternate amplifiers, its capacity should not be less than the fire .when simulcasting range fire emergency radio speakers a maximum capacity of total 1.5 times. <br> <br> <br> <br> <br> <br>.