说明：  利用三次样条函数对截断波形进行恢复。程序内部存有注释语句对三次样条和实现过程进行说明。包括有试验数据和结果对比图。
(Using cubic spline function to recover truncated waveforms. Statements within procedures there are comments on the cubic spline and the implementation process are explained. Including test data and results comparison chart.)