Indoor Acoustic Control System Design Research

In this paper,the planning and design process of an indoor multifunctional hall electric acoustic control system is studied,including the overall planning of the system,the design of each subsystem,the computer aided simulation design,and the design of special filters for sound field defects.The main contents of this thesis are as follows:1.According to the building space plan,the elevation plan and the parameters of the decoration material,the general design of the electric acoustic control system is studied and designed,and the schematic diagram of each subsystem is designed,and the digital tuning control system is designed.The link diagram of digital audio intelligent control system,amplifying system and loudspeaker signal processing.2.The sound field of the designed electric acoustic control system is analyzed by using the computer aided design software EASE.The reverberation time curve is obtained by the three-dimensional modeling of the multifunctional hall,and the sound absorption coefficient of each surface of the multifunctional hall is selected in the sound-absorbing material database.According to the structure and practical design requirements of multifunctional hall,the loudspeakers of corresponding types and parameters are selected,and the distribution design of loudspeakers is carried out on the basis of full consideration of direction and coverage,and the sound field coverage diagram is calculated and formed by using EASE software.The simulated sound pressure level,loss rate of articulation and intelligibility of speech consonants in each band of audio.The simulation results are in line with the requirements for the maximum sound pressure level,sound transmission gain,sound field homogeneity,transmission frequency characteristics and total system noise in the National Standard GB50371-2006 of the people's Republic of China.3.the functions of gain control,frequency equalization,signal delay,filtering,limiting and frequency division of symnet Express 8X8 digital audio processor in multifunctional hall system are expounded,and the intelligent control of electric acoustic control system is realized.4.The special filter is designed by using Butterworth low passing filter,and the acoustic defects in the sound field of the system are solved by MATLAB simulation.