CAJ | 학술논문

在进行快速傅里叶变换时，对信号进行截断会产生频谱泄漏现象。为减小频谱泄漏的影响，以理论分析窗函数为基础，利用Matlab作为辅助工具绘出汉宁窗、汉明窗、矩形窗、三角窗和布拉克曼窗的时域幅度与频域幅度曲线，分析了频谱泄漏的原理以及各窗函数的特点和性能，提出了在对信号进行截断时，如何通过选择合适的窗函数来减小频谱泄漏对信号分析的影响。用Matlab软件对某一信号进行加窗仿真实验，结果表明：汉宁窗最适合此实验信号，验证了选择合适的窗函数的重要性。
재진행쾌속부리협변환시，대신호진행절단회산생빈보설루현상。위감소빈보설루적영향，이이론분석창함수위기출，이용Matlab작위보조공구회출한저창、한명창、구형창、삼각창화포랍극만창적시역폭도여빈역폭도곡선，분석료빈보설루적원리이급각창함수적특점화성능，제출료재대신호진행절단시，여하통과선택합괄적창함수래감소빈보설루대신호분석적영향。용Matlab연건대모일신호진행가창방진실험，결과표명：한저창최괄합차실험신호，험증료선택합괄적창함수적중요성。
The signal is intercepted in the process of FFT, which will cause spectrum leakage. In order to reduce the effect of spectrum leakage, based on theoretical analysis of window function,using Matlab as a tool to make time domain amplitude and frequency amplitude curve of the Hanning window, Hamming window, rectangular window, triangular window and Blackman window,this paper analyzes the principle of spectrum leakage and the features and functions of the window function, chooses the appropriate window function to cut down the spectrum leakage which is provided. A simulation experiment that window function is added to a singal make full use of Matlab software,the Hanning window is most suitable for the signal in the experiment, verifying the importance of choosing the appropriate window function.