基于S域变换的声压衰减曲线计算方法优化  

Optimization on calculation method of sound pressure attenuation curve based on S-domain transformation

作　　者：桂桂[1] 高旭[2] 孙磊[1] 鄂治群[1] 尹永钊 付志勇[1] GUI Gui;GAO Xu;SUN Lei;E Zhiqun;YIN Yongzhao;FU Zhiyong(National Institute of Measurement and Testing Technology,Chengdu 610021,China;Unit 32603 of the PLA,Chengdu 610000,China)

机构地区：[1]中国测试技术研究院,四川成都610021 [2]中国人民解放军32603部队,四川成都610000

出　　处：《中国测试》2021年第9期47-51,共5页China Measurement & Test

摘　　要：针对声学测量设备不同时间常数对声压衰减曲线测量结果影响较大的问题,提出一种基于S域变换的声压衰减曲线计算方法。在分析时间计权声级计算原理的基础上,阐述现行声学测量设备的时间计权声级算法;选择不同的时间常数τ,计算得到各常数下的声压衰减速率;利用时间计权函数特性和卷积定理,通过S域变换与反变换后消除时间计权函数对声压衰减曲线的影响,进而提高混响时间测量的准确性。经过仿真和实验验证,该方法在不同时间常数下的测量结果一致性较好,避免时间常数选择引入的误差,具有一定的参考意义。Aiming at the problem that different time constants of acoustic measuring equipment has great influence on the measurement results of sound pressure attenuation curve,a calculation method of sound pressure attenuation curve based on S-domain transformation was proposed.Calculation theory of time weighted sound level was researched and therefore time weighted sound level algorithm of the current acoustic measuring equipment was expounded.By choosing different time constantsτ,the attenuation rate of sound pressure was calculated.The characteristics of time weighted function and convolution theorem was studied,the influence of the weighting function on the attenuation curve was eliminated through the S-domain transformation and inverse transformation,and the accuracy of the reverberation time measurement was improved.The simulation and experiment results showed that the methods has a good consistency under different time constants,and avoided the error caused by the selection of time constants.

关 键 词：混响时间 声学计量 声压衰减曲线 时间常数 

分 类 号：TB9[一般工业技术—计量学]