已知一个连续时间信号 ， ，取最高有限带宽频率 。分别显示原连续时间信号波形和 三种情况下抽样信号波形，并尝试用内插公式重建原信号。-A continuous time signals, known, take the highest frequency of limited bandwidth. Respectively according to the original continuous time signal waveform and the sampling signal waveform, the three situations and try to reconstruct the original signal with interpolation formula.