【摘要】 离散傅里叶变换(Discrete Fourier Transform,DFT)的频谱泄露及其抑制是教学中的难点,如何面向工程信号建立实验平台,来加深对理论的理解,成为数字信号处理教学的重点。利用Matlab设计一种展示离散频谱泄露以及抑制泄露分析界面的实验平台,该平台采用图形用户界面(Graphical User Interface,GUI)分别搭建频谱泄露和加窗抑制两个仿真模块。以非正弦周期信号为实验对象,通过同步与非同步信号采样DFT比较,发现频谱泄露的实质;通过不同加窗DFT结果比较,发现其对泄露抑制和频率分辨率的影响。在实验中,学生可改变参数对比实验结果,加深对DFT频谱泄露及其抑制原理的理解,提高其分析问题的能力。实验结果验证了实验平台界面的便捷性和有效性。更多还原

【Abstract】 Spectrum leakage and its suppression of discrete Fourier transform(DFT) are difficult points in teaching,how to set up experimental platform for engineering signal to deepen the understanding of theory and application,has become a key issue in the teaching of digital signal processing. Tailored for this problem,an experimental platform for displaying discrete spectrum leakage and suppressing leakage analysis interface was designed based on Matlab,the experimental teaching platform was used the graphical user interface(GUI) to build spectrum leakage and its windowing suppression simulation module,respectively. Taking the non-sinusoidal periodic signal as the experimental object,the essence of the spectrum leakage was found by comparing the DFT with the synchronous and asynchronous signals.Through different windowing DFT results comparison students can find its impact on leakage suppression and frequency resolution. During the experiment,students can change the parameters to compare experimental results,it deepens the understanding of DFT spectrum leakage and suppression principle,and improves ability to analyze problems. The experimental results verified the convenience and effectiveness of the experimental platform.更多还原