Weak current College】 【Stadium sound system design reference.

<br> <br> Currently, most small and medium-sized sports centre are considered as multifunctional use. In addition to meet future various sports competitions, training of functional requirements, but also takes into account various theatrical performances, audio system, must be .considered, do try to meet a variety of sound reinforcement needs. <br> Sound system design includes two aspects: one is the architectural acoustic design, mainly consider the gym body, building structure, selection, sound-absorbing materials. It mainly addresses: .reverberation time throughout the stadium, the acoustic field distribution uniformity, avoid various acoustic defect, so as to construct a sufficient loudness, clarity, uniformity of sound field, meet a variety of uses. Second, the electro-acoustic design, it must be built .on the basis of sound design, through various speaker selection, arrangement, audio equipment, systems, and ultimately, the venue of sound effects to achieve: loudness fit, language clear and beautiful sound. Therefore they must cooperate closely and coordinate design. <br .> Electro-acoustic design consists of 3 parts: <br> General requirements for the design of the system; including various subsystems: sound reinforcement for speech sound reinforcement, performances, broadcasts, sound reinforcement <br> Control room acoustic design <br> Above .the second is the key. <br> According to the MoE, acoustic design of the stadium standard measurement practices law, sound reinforcement system should include the following seven system: <br> (1) on the Auditorium sound reinforcement system; <br> .(2) of the competition venues; sound reinforcement systems <br> (3) on the athletes, coaches, referees, health care, and other staff lounge, driving range and workplace-calling call system; <br> (4) on the .rest of the audience, the room background music and broadcasting system; <br> (5) on Museum admission outlets nearby outside broadcasting system; <br> (6) the theatrical performances with a high-quality mobile sound reinforcement system; <br> .(7) other systems, such as gymnastic competition with mobile music playback system. They can be networked or stand-alone use. <br> Requirements under IRC, IRC electroacoustic no juice should include the following: <br> (1) must have .competition venue, audience seating, rest Hall, room Office of independent control and switch sound reinforcement system; <br> (2) must have for the opening ceremony, closing ceremony and theatrical performances of mobile sound reinforcement system; <br> (3) .must be able to switch the automatic emergency broadcast, automatically raising in excess of broadcasting sound level, according to the rules, procedures and flows for evacuation for emergency disaster communication timing broadcasting system; <br> (4) the recommended settings for radio and television .audio broadcast of the interface Terminal. <br> Acoustic design of the stadium measurement code for standards, sound reinforcement system characteristic parameters of the indicator is divided into 3 levels, each level has a maximum sound pressure level, transmission frequency, audio gain, sound .field uniformity, system noise five parameters and requirements, for small and medium-sized gym features parameter index requirements, from the economy, practicality, disturbing sexual, generally recommended "L3" o this is because, if the gym is in a residential area within .. maximum sound pressure level can not be too high to avoid leakage of disturbing sound, frequency transmission characteristics than the "level" of some low frequency bandwidth is narrow, requiring 250Hz-4kHz attenuate allow + 4/-10dB, in language spectrum energy concentrated .band, ensures high language definition, acoustic gain only "low level" 2dB. sound field not uniformity also only "low level" 2dB, system noise 3 levels of requirements are the same as the maximum sound pressure level is not too large, in addition .to avoid disturbing, but also reduces the sound system and power amplifier. To save large sums of money. Transmission frequency, audio gain, sound field uniformity, etc. mainly acoustical problems, set up juice and equipment of the system. Requirements of specific expressions .is: <br> (1) the public gallery enough loudness <br> (2) the speaker layout should cover the entire Auditorium and competition venues, try to make the sound field with uniform, should not be dead. <br> (3 .) have clearly heard conditions, good sense of direction and programming of fidelity: <br> (4) the system should have adequate stability and power. <br> In order to achieve the above requirements, refer to the Department of radio, film and .television, proclaimed by the standards of the auditoria system level indicators of the use of "language and music sound reinforcement system level indicators", game Hall sound reinforcement system design specifications: <br> (1) maximum sound pressure level (empty field steady quasi .-peak sound pressure level) 125Hz-4KHz average sound pressure level is greater than or equal to 102dB. <br> (2) transmission frequency characteristics in 100Hz - 16KHz average sound pressure level to 0dB, in this band allows greater than or equal to .+ /-3dB.) <br> (3) acoustic gain 125Hz - 4KHz average is greater than or equal to-10dB. <br> (4) sound field not uniformity 1KHz, 4KHz is less than or equal to 6dB. <br .>.