基于虚拟仪器的频率计权实现方法
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南京理工大学机械工程学院 南京 210094

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TN06

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Frequency weighting method based on virtual instrument
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Department of Technology of Measurement and Instrument,School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

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    摘要:

    传统的频率计权方法是通过搭建硬件滤波网络来实现的,其测试精度很容易受到电子元件带来的不确定因素的影响。为了克服传统频率计权方法中硬件电路的繁琐和测试精度的不稳定,文中提出了一种在虚拟仪器平台上实现频率计权的方法,详细阐述了通过FFT分析来实现频率计权的原理和方法,并给出了对应的程序框图。通过输入模拟信号的方式分别对A计权和C计权的测量效果进行验证,实验结果表明A计权和C计权的测量精度都达到了1级声级计检定标准。文中提出的频率计权方法简单灵活,既能简化硬件电路,又能满足测试精度的要求。

    Abstract:

    The traditional method of frequency weighting is realized by building up the hardware filter network, and the test accuracy is easily affected by the uncertainty of electronic components. In order to overcome the disadvantages of traditional method, such as complicated hardware and instable test, this paper proposes a method to achieve frequency weighting on the virtual instrument platform, describing the principles and methods of achieving the frequency weighting by the FFT analysis in detail and providing the corresponding block diagram. The measurement results of A and C weighting are verified by the way of inputting analog signals. The experimental results show that the measurement accuracy of the A and C weighting have reached the testing standards of the first class level of sound level meters. The proposed method is simple and flexible, and it can simplify the hardware circuit and satisfy the requirement of the test precision.

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李茂林,江剑.基于虚拟仪器的频率计权实现方法[J].国外电子测量技术,2016,35(12):27-31

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  • 在线发布日期: 2017-01-12
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