摘要
计算机声场模拟中,房间表面的吸声性能通常采用混响室法吸声系数来表示。该吸声系数的测量方法是建立在扩散声场基础上得到的,而实际混响室中放置吸声材料后声场并非为扩散场,由此将导致吸声系数的测量误差,影响声场计算机模拟的准确性。通过对混响室声场的模拟计算,建立材料吸声系数与混响时间的关系,并对实测的吸声系数进行修正可提高声场计算机模拟的精度。
The standard absorption coefficient measured in reverberation chamber is usually employed to characterize the absorbing surfaces in computer modeling of sound fields. The measurement of absorption coefficient is based on the assume that the sound field in reverberation chamber is fully diffused, however this will lead to uncertainty of absorption coefficient when sample is arranged in reverberation chamber. A relationship between absorption coefficient of sample and reverberation time is proposed and applied to correct the standard absorption coefficient. The comparison with in-situ measurement shows that the corrected absorption coefficient can improve calculation accuracy of reverberation time in computer modeling.
出处
《电声技术》
2008年第3期9-11,共3页
Audio Engineering
关键词
计算机模拟
吸声系数
扩散声场
computer modeling
absorption coefficient
diffuse sound fields
