用平面波展开法计算二维声子晶体带隙,语音信号的采集与处理，数字信号处理课设，电力系统暂态稳定程序，可以进行暂态稳定计算。- Computation Method D phononic bandgap plane wave, Acquisition and Processing of the speech signal, digital signal processing class-based, Power System Transient Stability Program, can be t