| A计权电路对p-p声强法测量精度的影响 |
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| 引用本文： | 陈品,陈心昭.A计权电路对p-p声强法测量精度的影响[J].合肥工业大学学报(自然科学版),2012,35(7):865-869. |
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| 作者姓名： | 陈品 陈心昭 |
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| 作者单位： | 合肥工业大学机械与汽车工程学院,安徽合肥,230009 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 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。
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| 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 |
Effect of A-weighted analog circuit on the accuracy of p-p sound intensity measurement |
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| CHEN Pin
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CHEN Xin-zhao.Effect of A-weighted analog circuit on the accuracy of p-p sound intensity measurement[J].Journal of Hefei University of Technology(Natural Science),2012,35(7):865-869. |
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| Authors: | CHEN Pin CHEN Xin-zhao |
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| Institution: | (School of Machinery and Automobile Engineering,Hefei University of Technology,Hefei 230009,China) |
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| Abstract: | The A-weighted analog circuit is more useful than digit weight,because of its stability,real-time 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. |
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| Keywords: | A-weighting analog filter sound intensity measurement two-microphone method measurement error uncertainty |
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