摘要
与数字计权相比,模拟计权电路具有稳定可靠、实时性高、动态范围宽等优点。文章对A计权电路参数进行了计算,分析了电路幅值、相特性对声强测量系统测量精度的影响,给出了电路参数调整策略,并最终对其产生的声强测量不确定度进行了评定。结果表明,通过对器件的筛选、改变隔离棒长度和微调电阻,可有效控制电路对声强测量精度的影响。
The A-weighted analog circuit is more useful than digit weight, because of its stability, realtime capability and large dynamic range. In this paper, the parameters of this analog circuit are worked out, and the effect of the magnitude value and phase behavior on the measurement accuracy of sound intensity measurement system is discussed. Then the adjustment strategy of circuit parameters is given, and the uncertainty caused by the A-weighted analog circuit is evaluated. The results show that the error effect caused by the A-weighted analog circuit can be reduced markedly by screening component, adjusting resistance and choosing longer partition between two microphones.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第7期865-869,共5页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(10974040)
关键词
A计权
模拟滤波器
声强测量
双传声器法
测量误差
不确定度
A-weighting
analog filter
sound intensity measurement
two-microphone method
measurement error
uncertainty
