| 用DFT对连续信号谱分析的误差问题 |
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| 引用本文： | 乔建华,张雪英.用DFT对连续信号谱分析的误差问题[J].现代电子技术,2014(13):53-56. |
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| 作者姓名： | 乔建华 张雪英 |
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| 作者单位： | [1]太原科技大学电子信息工程学院,山西太原030024 [2]太原理工大学信息工程学院,山西太原030024 |
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| 基金项目： | 山西省自然科学基金项目（2013011019-1）;山西省教育厅基金项目（2009sjg202） |
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| 摘 要： | 谱分析是数字信号处理中的一个重要问题,初学者普遍对连续信号谱分析理解不深,尤其是在误差分析时缺乏统一示例,更容易产生困惑。介绍了用离散傅里叶变换(DFT)对连续信号进行谱分析的过程,并详细说明了误差产生的原因和减小误差的方法。而且通过对模拟信号谱分析的实例全面说明了各项误差的影响及解决方案,并应用Matlab直观地进行了分析和对比验证。
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| 关 键 词： | 谱分析 误差分析 DFT Matlab |
Error of continuous signal spectrum analysis based on DFT |
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| QIAO Jianhua,ZHANG Xueying.Error of continuous signal spectrum analysis based on DFT[J].Modern Electronic Technique,2014(13):53-56. |
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| Authors: | QIAO Jianhua ZHANG Xueying |
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| Institution: | 1. College of Electronic ＆ Information Engineering, Taiyuan University of Science ＆ Technology, Taiyuan 030024, China; 2. College of Information Engineering, Taiynan University of Technology, Taiyuan 030024, China) |
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| Abstract: | Spectrum analysis is one of the important missions in digital signal processing. The understanding of most begin-ners is not deep to continuous signal spectrum analysis,especially lacking of a uniform example in the error analysis,so it is easier to be confused. The process of continuous time signal spectrum analysis using the discrete Fourier transform（DFT）is in-troduced in this paper. The reasons of generating the errors and the methods of minimizing the errors are illustrated in detail. The influence and solutions of various errors are elaborated through a concrete example of analog signal spectrum analysis. It is verified intuitively through analysis and contrast with Matlab software. |
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| Keywords: | spectrum analysis analysis error DFT Matlab |
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