形象地描绘出了功率谱密度曲线。自适应窗口，鼠标跟随显示出坐标。-Vividly depicts the power spectral density curve. Adaptive window, the mouse coordinates to follow the show.

利用matlab来进行画门函数的频谱图和能量谱密度图-Use matlab to draw gate function spectrum and energy spectrum density map