本程序仿真了信号与系统中的频谱混叠，频谱泄漏和栅栏现象，包含三个文件：pinpufenxi.m, pinpufenxi.fig和一份word简介文档。-the process of signal simulation system with a spectrum-aliasing, spectrum leakage and fencing, contains three documents : pinpufenxi.m, pinpufenxi.fig and a brief word document.