摘要
介绍了利用DFT分析信号频谱的基本流程,重点阐述了利用DFT分析信号频谱时产生误差的原因,即存在的频谱混叠、频谱泄漏及栅栏效应,并提出了相应的改进方法。实例列举了MATLAB环境下DFT分析信号频率分辨率的影响因素,通过与理论分析的对比,解释了提高频率分辨率与计算分辨率的方法。
The process of spectrum analysis by discrete fourier transform（DFT）is introduced in this paper,the reason of error is explained in detail when the signal spectrum is analyzed by DFT,that is to say,when there are the spectrum aliasing,spectrum leakage and picket fence effect in the system,and the improved method is put forward accordingly.The application procedures are listed in the MATLAB,the methods of improving the frequency resolution are explained.
出处
《机械工程与自动化》
2014年第4期47-49,共3页
Mechanical Engineering & Automation
