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 wavef