SOLUTIONS

Sports venues are professional places for sports training, sports competition and physical exercise. It is a general term for all kinds of sports places specially built to meet the needs of sports training, sports competition and mass sports consumption. Sports venues mainly include stadiums, gymnasiums, natatorium that are open to the public and provide various services, track and field sheds, wind and rain playgrounds, sports arenas and other indoor and outdoor venues required for sports teaching and training, sports clubs, gyms, gymnastic rooms and other simple fitness and entertainment venues required for mass sports, fitness, entertainment and leisure activities.
It is mainly divided into the stadium for outdoor competition training and the stadium for indoor competition training.
The scheme is as follows:
First.The main characteristics of the electroacoustic system of modern sports venues can be broadly summarized in three aspects:
★ Pay more attention to the sound effects of the auditorium and the venue;
★ In order to meet the needs of the opening and closing ceremonies of large-scale sports competitions or artistic performances, more attention is paid to the corresponding "flow" sound reinforcement system;
★ Electroacoustic systems pay more attention to the use of digital network transmission and control systems.

Second.The electroacoustic system of sports venues mainly includes
1.Meet the on-site sound reinforcement system of sports competitions
2.Flow sound reinforcement system to meet the opening ceremony, closing ceremony and large artistic performances
3.Automatic priority broadcast system that meets multi-level broadcasting (including emergency broadcasting)
4.Digital network signal transmission and control system
5.Power amplifier and signal transmission fault automatic detection system

Third.The basic requirements of sound reinforcement system for sports venues
1.The regular use of sports venues is sports competitions or mass gatherings, so the basic requirements of the sound reinforcement system are to ensure the intelligibility (or clarity) of the language reinforcement. This may seem simple in implementation to really satisfy the stadium spectators (or most spectators) have a good hearing is not easy.
2.The use of sports venues if there are large-scale games opening ceremony, closing ceremony or large-scale high-level artistic performances, then the sound reinforcement system with high-quality "flow system" and the original "fixed" installation system combined use, the effect will be better and more economical way.
3.The audience group of modern sports venues is different from the traditional "audience", more is to support the "fans" cheerleaders of the participating teams, and the atmosphere of sports games is warm. However, for sound reinforcement, the background noise level increases and is random, which should be fully paid attention to in the design of sound reinforcement system.

Fourth.Specifications for acoustic characteristics of sports venues
1.Specifications for acoustic characteristics of gymnasium
《The Regulations for Acoustic Design and Measurement of Gymnasiums, edited by China Academy of Building Science and approved by the Ministry of Construction, is a national industry standard and has been implemented since March 1, 2001. Its main contents include: general provisions; Architectural acoustic design; Noise control; Five parts, including sound reinforcement design and acoustic measurement (see JGJ/T131-2000,J42-2000). The competition hall is basically divided into the comprehensive gymnasium competition hall; Swimming pool competition hall and skating hall, etc.
2. Acoustic characteristics of the stadium
At present, there are no written norms for stadium acoustic characteristics in China. Recently, the relevant information of the World Football Association (FIFA) and the German Football Association (DFB) shows that the requirement for the steady sound pressure level of the stadium audience reinforcement is about 105dB.
The acoustic characteristic index requirements of the main sound reinforcement system of the new or rebuilt stadium for the 2008 Beijing Olympic Games;
Sound pressure level: 95dB in normal use; Maximum sound pressure level (emergency broadcast)106dB.
Transmission frequency characteristics: language use 100Hz ~ 5KHz±5dB;
Music uses 100Hz ~ 15KHz±5dB.
Language articulation: Rapid language delivery index RASTI≥0.5.
It should be pointed out that although the stadium is a non-enclosed space, it is very important that the sound reinforcement design cannot simply be treated as a free sound field. Most of the stadium seats above the "ceiling" there is a sound reflection, a typical stadium can accommodate tens of thousands of seats, the reverberation time will be about 5 seconds, the reverberation time will be about 3 seconds when the audience is full. Therefore, sufficient attention should be paid to the design of sound reinforcement system.

Fifth.Sound field control is the basis of sound reinforcement system design Sound reinforcement belongs to the category of applied acoustics, whether indoor or outdoor sound reinforcement can not be separated from the acoustic environment (or sound field) in which the sound reinforcement is used. The final effect of sound reinforcement is the embodiment of the integrated effect of construction sound and electrosound, so the basic problem of sound reinforcement system design is acoustics, which is to complete the analysis and design calculation of sound reinforcement field on the basis of construction sound. If a sound reinforcement field is evaluated from the acoustic characteristics of the sound reinforcement system, it mainly includes the maximum noise pressure level, transmission frequency characteristics, sound field unevenness and transmission gain. If an amplified sound field is evaluated from the sense of hearing, it mainly has the clarity of language and music, and the sound quality effect of "many attributes" of sound. Whether it is indoor or outdoor sound reinforcement, there is more or less sound interference in the sound field, perhaps this is inevitable. The presence of acoustic interference in the amplified sound field will affect the clarity of the language and music, and damage the sound quality of the amplified sound replay. Modern sound reinforcement design is no longer "satisfied" with the sound pressure level and the non-uniformity of sound field in the general sense, but attaches great importance to the sound interference problem of sound reinforcement sound field, and tries to minimize the sound interference in the design, which is the focus of modern sound reinforcement design.