The Geometric Parameters Of Natural Sound Good Classroom Heard Environment Research

With colleges and universities year after year freshmen enrollment, the number ofexisting classrooms of colleges and universities cannot meet the requirements of theexisting number, a large number of new classrooms were put into use, but because of lackof understanding of the causes of classroom acoustics problems and their solutions, manynew school classroom, regardless of size, sound reinforcement equipment are used toincrease the volume of teaching and interior points of sound pressure level, not only didnot make the classroom teaching sound environment to be fundamentally improved, andthe resulting reverberation room acoustic properties and artificial reinforcement too long,affected speech intelligibility, or distribution of classroom acoustics serious uneven,teaching effect has been seriously affected, and lectures, students produce irritability, asense of the results of the transformation of classroom is not only a waste of resources, theeffect is not satisfactory.In this paper, factors affecting classroom acoustics analysis to determine the languageto use the hall of the main physical parameters. Select Capital University of Economics asa research object, the first paper the investigation of the subjective feelings of students’classroom outdoor noise, most of the students that the corridor to walk around and talk tothe sound and traffic noise environment of the classroom heard in the survey, and life noiseadjacent classroom lecture audio is less affected. Then the basic physical quantities of theclassroom (classroom size, interior decoration, etc.) to investigate and measure theclassroom background noise and the theory of computing classroom reverberation time.Select the four teaching building of the Capital University of Economics in the eightclassrooms to measure the reverberation time and classroom point of SPL. Actualmeasurement of the reverberation time to determine the average absorption coefficient ofthe two types of typical classrooms; SPL situation of the classroom, and in other languagesto use the hall’s dimensions to determine the classroom sound field is uniform, classroomdimensions relationship. To determine the conditions of natural sound source, two differenttypes of interior decoration of classrooms, good acoustic environment, the depth limit of7.75m and8.2m, respectively, and consider "civil sound insulation design specifications onthe reverberation time requirements and the full field when the audience sound absorptionand other factors, it is recommended that two types of typical classrooms length is notgreater than10m and11m, the results of this study provide a reference for the classroomdesign.