Design Of Acoustic Control System Based On EASE

This dissertation designs and researches detailedly the electro-acoustic control system of a major theater from planning, design, construction and commissioning of the entire process including the design planing, computer aided design guidelines, measured data, the theatre subsystem design, digital audio processor for centralized control and intelligence deficiencies sound field special filter design.The main contents of this dissertation are:1.According to the theater floor plans, elevations and decorative units decorative map and various decorative material parameters provided by The Architectural Design and Research Institute, computer-aided design software EASE is used to obtain three-dimensional model of the theater and model the absorption coefficient within each area to meet the room reverberation time curve.2. According to theater structure and actual needs, various types of speakers layout and technical parameters and directional selection are obtained. Software EASE is used to computer and form acoustics coverage, analogical pressure level, articulation loss, rapid speech transmission index and arrival time.3. According to the above analysis of the data, the statistical tables of above four indexes compares with The People's Republic of China National Standard GB50371-2006"hall sound reinforcement system design". The acoustic target reaches or exceeds national standard at last.4. The components and functions of the speaker system (the center channel, left and right channels, feedback monitoring, effect sound,etc),digital main tuning system ,digital audio workstation system, analog multi-tuner system, speaker signal processing system, stage monitor system and the communication system are expatiated . Diagram of each subsystem and link diagram are made at the same time.5. The star topology is selected based on reliability and economy from the comparative analysis between the theater digital optical transmission system two kinds of star and ring topology. 6. The centralized and intelligent control is achieved in this complex system. The U.S. Company's Express 8x8 is used as powerful DSP processing to achieve a balanced, signal distribution, delay, filtering, effect, matrix, clipping frequency, etc. It conducts a complete control program through Symnet designer.7. According to field measurement, the user experience and the acoustic sound field defects, the special filter is designed comparing with IIR and FIR, Lin Kuizi-Rayleigh, Butterworth and Bessel filter of the indicators. The final selection is Butterworth low-pass filter that designs the parameters of filter and uses MATLAB to simulation.