| 基于DFT的信号幅值谱分析 |
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| 引用本文： | 李芳,曹长修. 基于DFT的信号幅值谱分析[J]. 重庆理工大学学报(自然科学版), 2007, 21(4): 64-66 |
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| 作者姓名： | 李芳 曹长修 |
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| 作者单位： | 重庆大学自动化学院 重庆400044 |
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| 基金项目： | 重庆市科技攻关重点项目(CCSTC,2005AA4006-139) |
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| 摘 要： | 根据离散傅里叶变换DFT的定义,推导出数字信号幅值谱的解析计算方法,并通过C Builder开发工具设计了一套测试程序,对数字合成信号进行了幅值谱的计算仿真,仿真结果验证了算法的有效性.最后,诠释了频谱泄漏及栅栏效应的问题,并提出了相应的改进方法.
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| 关 键 词： | DFT 幅值谱 频谱泄漏 栅栏效应 |
| 文章编号： | 1671-0924(2007)04-0064-03 |
| 修稿时间： | 2007-02-13 |
DFT-Based Analysis on Amplitude Spectrum |
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| LI Fang,CAO Chang-xiu. DFT-Based Analysis on Amplitude Spectrum[J]. Journal of Chongqing University of Technology(Natural Science), 2007, 21(4): 64-66 |
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| Authors: | LI Fang CAO Chang-xiu |
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| Abstract: | From the definition of DFT,calculation method of amplitude spectrum for digital signal is derived in this paper.Through a testing program designed with C Builder tools,simulation of amplitude spectrum calculation is fulfilled and the efficiency of the algorithm is validated to satisfy the need for project.In the end,the problems of spectrum leakage and picket fence effect are explained and the corresponding solution is proposed. |
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| Keywords: | DFT amplitude spectrum spectrum leakage picket fence effect |
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