实现各种调制与解调方式的有关运算；对DSB，抑制载波的双边带、SSB，FM等调制方式下调制前后的信号波形及频谱进行观察； 对DSB，抑制载波的双边带、SSB，FM等调制方式下解调前后的信号波形及频谱进行观察；-Way to achieve a variety of modulation and demodulation of relevant operations pairs of DSB, inhibit carrier DSB, SSB, FM modulation mode, suc