采用脉冲反向积分法的手持式混响时间测量仪的设计(英文)

Design of Hand-held Reverberation-time Meter by Integrated Impulse Response Method

本文对GBJ76-84提出的切断噪声和ISO3382提出的脉冲响应后向积分的混响时间测量方法做了简要介绍,提出了基于脉冲反向积分法的手持式混响时间测量仪的解决方案,并从量化误差、检波器平均方式及平均时间、滤波器响应、取样时间间隔、积分上限及拟合方法六个方面分析了影响测量精度的因素,通过在华南理工大学混响室和某教室的对比实验分析,证明采用脉冲反向积分法的手持式测量仪具有现场测试使用方便,声能衰减曲线比较平滑且波动起伏小、测量结果重复性好的优点。

In this paper,the two methods of reverberation-time testing mentioned in GBJ76-84 and ISO3382 are introduced briefly with the design of a hand-held reverberation-time meter by the Integrated Impulse Response Method discussed in detail.The precision and error is analyzed from six aspects,Experiments were performed in the reverberation room and a classroom of South China University of Technology.By comparing the results,it was concluded that the decay curve of energy obtained from the Integrated Impulse Response Method is more smooth and little fluctuant,and the measurement by the hand-held reverberation-time meter is rapid,convenient,and accurate.