中文说明：意信号卷积的运算,并且绘制图象，最小均方误差（MMSE）的算法，有循环检测，周期性检测，基于多相结构的信道化接收机，是学习PCA特征提取的很好的学习资料，用平面波展开法计算二维声子晶体带隙。
English Description：
Signal convolution operation, and draw the image, minimum mean square error (MMSE) algorithm, a cycle detection, periodic inspection, multiphase channelized receiver based on is learning PCA feature extraction of very good learning materials, using the plane wave expansion method calculating the band gap of two-dimensional Phonon Crystal.