中文说明：一个很有用的程序，对信号进行频谱分析及滤波，插值与拟合，解方程，数据分析，复化三点Gauss-lengend公式求pi，相参脉冲串复调制信号，包括面积、周长、矩形度、伸长度。
English Description：
A very useful procedure, the signal of frequency spectrum analysis and filtering, interpolation and fitting. By solving the equations, analysis of data, the complex of three Gauss-lengend formula for PI, coherent pulse train with complex modulation signal, including area, perimeter, rectangularity, stretching the length of the.