College】 【weak sound system engineering and construction technical requirements of steps --- Power By weak home network 【China】.

<br> of professional sound engineering and technology are brought together multi-disciplinary knowledge of a top integrated technology, it is associated with professional audio technology and development. .Especially the audio and lighting equipment performance and quality increasing, the importance of professional audio engineering technology to become stronger, to make an analogy: professional audio works like a tailor in a garment cut, professional audio equipment like the clothes .fabric, what kind of fabric on the market anyone can buy, but the general fabric of good tailor can play its most important feature, make a good clothes; and even the best fabric showed a poor tailor, he also .can not make a nice dress. .Professional audio works is like this, the same cost, different design, quality will be high and low points; same equipment, different facilities, quality will be high and low points. .<BR> <BR> Summed up in sound engineering characteristics: small quantities, but the engineering and technical content; engineering flexibility, but the heavy responsibility. .To say that the workload of professional audio, line the technical staff know: a medium-sized project, goes well with a two hundred man-hours is sufficient; little large-scale projects will also be able to complete several hundred hours, so compared to other industries .The project is really small quantities. .But in this project is not actually contain a high technology content, the need for strict design and selection of qualified embedded need to wear tube technology; need for reliable welding technology; need for scientific testing means of debugging, etc. .flexibility to say the project is also a fact, sound engineering by objective factors is not too large, but rather the general user or decorative units to try to meet the requests sound engineering, but in these flexibilities in the great responsibility also included .Imagine; easily hundreds of thousands to millions of works you go to construction, or engineering if mainly the poor quality, or even leaving engineering problems, it should bear a responsibility to big. .<BR> <BR> One <BR> <BR> requirements engineering as a high technology content, assume greater responsibility in the professional sound engineering in the construction technology has special requirements. .First, we should have qualified construction team. .State works for the sound must be efficient and reliable, if not a qualified construction team, not only design can not be effectively implemented, and the construction quality is difficult to guarantee, in the only team there should be: relevant technology licensing .license electricians, welders and electronic technicians, and sound so far as is some experience in the construction of the staff, so the construction team to ensure the successful completion of projects. .Second, the works must be in strict accordance with the design. .States for the sound engineering is a complex engineering design and construction techniques by the theory of the impact of large construction projects if the rule of thumb to act recklessly by imagination, is sure to bring bad consequences, and the design is to fully understand the .kinds of information and conduct a series of calculations to complete, it must be the basis for the construction work. .Last is that Engineering must follow the corresponding technical specifications for construction. .Sound engineering in the construction will involve different types of work, the construction of these types of technical requirements and different security measures, only the serious implementation of these specifications in order to ensure that all the construction aspects of quality, to ensure the safety of construction workers, the specific .The technical details and notes, the author had "Audio Technology" magazine devoted been described, here without further analysis. .<BR> <BR> Two construction steps <BR> <BR> (1) First, the pipeline and attached to embedded parts. .<BR> <BR> Embedded pieces of pipe and attached the project to determine the general need to be immediately after the start, because generally speaking, are embedded in the pipeline is not built the main stage where the ground or no decoration dolphin .wall in, if not embedded in time, it is likely to influence the progress of decoration, but must pay attention to the export pipeline is embedded must be co decoration department, or they may be due to mishandling of decorative appearance; .articulated parts embedded position and lifting strength building and technical personnel must be recognized, or security can not be guaranteed, usually buried in the cement structure needed in the pipeline to choose better quality of steel pipes, diameter cable according to the number worn by .to decide; <BR> <BR> through the roof, decorative wall pipe, generally used in PVC trunking iron or fire, mainly threading convenient construction to accommodate a large amount of cable, but also fire; for the laying of the distance .longer pipeline, a certain distance must be set up in the manhole, the last must be noted that the work is almost embedded pipeline can not be changed, once decided where, how much buried, how buried and embedded after the completion of ., to change is unlikely, so the former must be carefully embedded analysis and design, specifically the equipment number, location, power supply and control the situation, put forward on this basis, the exact line number, diameter and direction. .<BR> <BR> <BR> (2) Second, to conduct a variety of studio, frame welding and installation. .<BR> <BR> This work as cross and decoration works, because in the construction of a number of holes and the inevitable opening of the decorations have been damaged, they need to help complete the decorating department, in the welding process, we must .to have qualified workers to operate welding, this way of security requirements in addition to the main welding quality is directly related to the scaffolding lifting strength, can not be careless at the same time, because the welding construction and decoration works are usually the same time, the spot .Some flammable, so the construction must pay attention to fire prevention, to be solid welding, painting is completed, you should begin the shelf installation, the installation of security is also very important, there must be a more adequate building and technical personnel to start lifting when .; last is all of the installation pieces are reliable measures of protection must be added, so that only the installation of security guarantee. .<BR> <BR> (3) and then the following will be a variety of cable laying. .<BR> <BR> This work is a relatively simple, but it should also be seriously, in particular, to wear out of this one, can not tolerate a little sloppy, the laying of cables to grasp the moral and rational methods, such as wear and wear steel tube .The cable should be tightly and reduce rolling resistance of the first quest, if necessary, apply a small amount of oil; followed by cable damage or disorder of the trouble; Furthermore, is the time to carefully lay the cable to check the cable, like the skin is .broken shield is damaged and the wire is broken and so on; Finally, we must do a good job in laying the cable was on the mark, in order to repair the installation of equipment and future use. .<BR> <BR> (4) and then should be followed by the installation of various equipment, equipment installation must be completed in the decoration, right after the laying of the cable, audio and lighting equipment for the country not only expensive, but many devices need to avoid dust .of contamination, site decoration is not suitable for messy installation of equipment, installation of equipment should be noted that out of the box the first to carefully check the packaging for many foreign equipment is standardized, there are a number of important spare parts or instructions may be isolated in a separate box .the bottom, it is easy to unpacking the box together with the throw; followed by installation of equipment should carefully read the instructions before to master the correct installation methods and procedures. .For example; light bulbs and many computers are required to wear cotton coated gloves, glass installation, are not allowed to touch with bare hands; the final equipment installation is to be strong, protective measures must be in place, especially the lighting equipment, set high, the weight of large and to .regular exercise, the general and the top of the stage or dance floor, so to be absolutely safe. .<BR> <BR> (5) Last is the power lines, control lines and signal lines connected. .<BR> <BR> This is a serious need for detailed and technical work, so should be skillful and strong sense of responsibility of personnel in the line of connection, the first way to ensure that the requirements under the state without electricity, because the sound .lighting equipment, power supply requirements vary, if the installation to provide power not only to poor security, and easy to damage the equipment; Secondly, the construction meet the requirements of electrical installation practices, because the electrical installation rules to test whether a reasonable standard way, so .or not in accordance with standard construction, to quality of the project is completely different, many of the formal construction in accordance with standard engineering expert to see that job done, "beautiful"; Moreover, requiring a variety of connectors, large-scale projects .required to be a variety of two core, three core, Lotus connectors, XLR plugs, the number of multi-core non-party plug large, often need a few people while making a very long time to complete, if you do not know the correct connection before soldering methods .and welding methods, we can imagine how much trouble will come back to Qigong, it must be clear, for example: some European foot XLR audio products, and not the same as the number of general use, do not weld wrong; <BR> < .BR> Some light shielding requirements of the control line high, if the welding is unreasonable, it is possible to produce light malfunction; last request line all the live, neutral, ground and shield connections must be accurate, the power .the supply side, to note are: sound and lighting equipment used in some power to often cause misunderstandings, for example: Some devices use 110V AC, while the transformer is a separate plug-random, and if the connection line when it is forgotten, .directly to the device power plug on the power supply is 220V, the consequences can be imagined; another example: some of the same edge device using a low-voltage alternating current, and some they use low-voltage DC, and their appearance is similar to the plug, if .not careful, after power for those who cause the sound to reverse the low light extinction, acoustic pressure drop, sound quality is bad consequences, but also easy to cause the device to live shell, leaving the security risks; from the screen is concerned, the system network interference .capacity, mainly depends on the system shielding and shielding is who is correct does not work, heavy equipment will be damaged, and power lines phase error may affect the speaker's phase, which has the right and the screen quality will often .found in a number of projects: either no mask or shield the formation of closed-loop; either the shielded cable connection error did not form the network can not resist interference shielding, and even some engineering and construction staff will signal to the zero power, ground, shield .and signal lines confuse these essentials, random access, not only not anti-interference, but also bring a lot of interference, they must first actually put these concepts to understand clearly. .<BR> <BR> <BR> (6) The other is the installation, power lines, connecting the inspection. .<BR> <BR> Sound engineering of the entire system because of the connection involves more points and connectors in the installation may also cause an error because of the individual, so careful examination is necessary, the general examination, including equipment .Install security, power lines is reasonable, the connection of the connectors is correct and so, there is another critical test items are: carefully check the status of each piece of equipment meets the design requirements set, this must not forget that .or vulnerable to damage the equipment, these states include; amplifier in the bridge request, the bridge switch is set; each device's power switch is the right choice; lights or electronic control device is a voice; address code scanners are set correctly .; projector input settings, and more. .<BR> <BR> (7) steps to be more confident that the construction is completed, the equipment should be ready to debug. .<BR> <BR> For equipment debugging, because each project is different, it is difficult unity of a common approach, requires a separate discussion of classification, if it is to fully complete the engineering for all types of debugging are introduced, the size of .will be too big, here only in general engineering equipment easy adjustment are introduced. .<BR> <BR> A. .<BR> <BR> Debugging Preparing to debug sound engineering is a need both skill and experience they require careful and meticulous work of the spirit, when the design and construction are in line with requirements, detailed debugging is not unreasonable, not only can not achieve .the design of the project results, but also may work in the equipment is not normal. .Therefore, before commissioning the work to fully realize the importance. .<BR> <BR> Carefully before commissioning sure each piece of equipment is installed, the connection is correct, serious inquiries to the construction workers left the construction may affect the use of the problem; debugging carefully before recognizing that every piece of equipment is installed, connect the right .seriously asked to construction workers may affect the construction of the remaining issues related to use; debugging again before the equipment carefully read all instructions carefully review the design drawings marked and connections; debugging must be satisfied before the power lines and power supply voltage .no problem; debugging not related to the former should ensure that on-site personnel; debugging ago but also to prepare the appropriate equipment and tools. .<BR> <BR> B. .<BR> <BR> Sound system sound system debugging debugging debugging is the key works, sound system equipment involved most commissioning the site is also most likely to encounter the most problems, so focus first to do it. .Need to prepare the equipment and tools: phase meter, noise generator, spectrum analyzer (with sound level meter), meter and so on. .<BR> <BR> Debugging steps: a single boot, from the audio signal transmission began to gradually check the situation, this check makes sense, because only the signal transmission device in all a good amplifier and speakers will get to after a normal .correctly handle the signal, it may have a good quality sound reinforcement, so do this step work, must be patient, must be careful in this step, the speaker and amplifier connected to the first, do not worry, peripheral processing devices .best placed in the bypass state. .Check the whereabouts of the signal to follow the step by step down the signal to check the whereabouts of, and gradually check its level set, gain, phase and smooth the situation, ensure that all equipment can get the best equipment before the signal level, but also .provide the best signal for the lower, while checking the signal should also check its level and gradually setting, gain, phase and smooth the situation, ensure that all equipment can get the best equipment before the signal level, but also for lower .provide the best signal, check signal in the same time, one by one observation equipment should also be working properly, is stable, meaning this is a single piece of equipment failure or unstable at this time, was easier to deal with, not .would jeopardize the safety of other devices, so that the check not be taken into the next step. .After the above is correct, it will access each speaker and amplifier system, the smaller the volume, the use of the first phase of instrument positions one by one check all boxes are the same phase, to prepare for the following commissioning, the noise generator and equalizer .access system, the spectrum analyzer is ready to begin a moderate volume equalizer access system, the spectrum analyzer is ready to begin a moderate volume to debug the equalizer equalizer, spectrum analyzer test points selected in accordance with relevant standards, .Commissioning of the equalizer principle is: the spectrum analyzer is 20Hz ~ 20kHz audio range, frequency response curve shown in the hall at the base of all test points straight, pay attention: when tested at various points on the volume to make consistent, then .Record the balance after the commissioning of the frequency position of the potentiometer; the same with a smaller volume and consistent with the larger volume, and then record the equalizer after good debugging of the frequency position of the potentiometer; similarly to the smaller volume .and the larger volume were once again testing, debugging the results of the equalizer and then recorded the final result will be some debugging data analysis, to find a variety of volume levels are measured by the frequency of the compromise position, and then .further testing, and frequency response curve depicted down the hall, the ultimate equalizer, the frequency position should be recorded, Note: The balance of debugging, the mixer frequency compensation must be placed 0, other .peripheral equipment in a bypass mode to the other should be noted that: in the usual sound engineering, considering the halls of the decorative materials absorb high-frequency signal is weak, so it can properly be made a little signal above 10kHz attenuation. .<BR> <BR> Above steps are done, you should debug the electronic crossover. .Debugging can be divided divider high, medium and low-frequency alone, which divider in the system for different purposes. .Debugging methods are different, if, only for the bass speaker crossover frequency, and that as long as the equalizer in the commissioning is completed, so the bass speaker to work alone, taking the crossover at 150 bass crossover .300Hz between the appropriate adjustments to the bass signal gain, can feel the bass level is appropriate, then, together with full-range system lyrics, then the bass and the smooth full-frequency sound; if the frequency divider used in the whole system would require .exact parameters provided by the manufacturer in accordance with speaker Lou Do not set high, medium and low frequency crossover point, and then repeated for each frequency band signal gain adjustment, until the band's sense of hearing more balanced, then the light spectrum analyzer in the next step .pressure test point test case for further fine-tuning. .Equalizers and electronic crossovers to be the basic debugging has been completed, the hall began to sound pressure level should be determined, the original selected test point or points that should be pink noise source noise meter, the test in addition to full band, the .as far as high, medium and low frequency band of a few selected tests goal is: to ensure that the signal in the best dynamic of the premise, allows the system to adjust the sound of pressure in the expansion must meet the design points .sound pressure level at the same time to refer to high, medium and low frequency of the spots, and then were on the equalizer and electronic crossover slightly adjusted. .<BR>.