一、观察序列频谱，观察信号通过系统后波形与频谱的变化。

系统函数，根据正准型结构（canonical form）编写样本处理算法。

-First, observe the sequence of the spectrum, observing the signal waveform and frequency spectrum through the system after the changes. System function, according to canonical structure (canonical form) the preparation of a sample processing algorithm.