| 基于LabWindows/CVI的信号周期的精确计算 |
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| 引用本文： | 张莉,钱光弟,程昕.基于LabWindows/CVI的信号周期的精确计算[J].实验科学与技术,2010,8(4):33-35. |
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| 作者姓名： | 张莉 钱光弟 程昕 |
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| 作者单位： | 1. 电子科技大学自动化工程学院,成都,610054
2. 成都中科动态仪器有限公司,成都,610041 |
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| 摘 要： | 采样信号时,总是不可避免地引入噪声,利用滤波器并不能消除信噪比较小的噪声。这些噪声的存在,必然会使信号的幅值、周期等信息发生改变,因此,在确定信号周期时,如果继续简单地利用周期的基本概念来计算,将会得到错误的结果。针对以上问题,文章提出了基于施密特触发器和最小二乘法两种原理的信号周期计算方法,这两种方法可以在很大程度上减小这些噪声的影响。最后,通过在Labwindows/CVI上的实现,显示出这两种方法的计算效果。
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| 关 键 词： | 信号周期 施密特触发器 最小二乘法 Labwindows/CVI系统 |
Accurate Calculation of Signal Period Base on LabWindows/CVI |
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| ZHANG Li,QIAN Guang-di,CHENG Xin.Accurate Calculation of Signal Period Base on LabWindows/CVI[J].Experiment Science & Technology,2010,8(4):33-35. |
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| Authors: | ZHANG Li QIAN Guang-di CHENG Xin |
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| Institution: | 1.School of Automation Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China;2.Chengdu VIDTS Dynamic Instrument Co.Ltd,Chengdu 610041,China) |
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| Abstract: | Noise is always added to signal while sampling signal.It is hard to eliminate the noise which signal-to-noise is small in despite of using filter.Numerical value and period of signal may be changed because of this noise.Therefore,when it is needed to compute the period of signal,it would acquire some wrong results if the way which is used and based on the conception of period is continued.Thus,this article puts forward two kinds of methods based on Schmitt trigger and Least Mean Square.The two ways can minish influence of noise at a great extent.After implementing them on Labwindows/CVI,it is easy to see the effect and difference of the two kinds of way finally. |
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| Keywords: | signal period schmitt trigger least mean square labwindows/CVI |
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