用matlab对信号消噪，用小波提取信号节律并计算功率谱-Signal extraction using matlab signal denoising using wavelet rhythm and calculate the power spectrum

用平面波展开法计算二维声子晶体带隙,matlab小波分析程序，用于信号特征提取、信号消噪。- Computation Method D phononic bandgap plane wave, matlab wavelet analysis program, For feature extraction, signal de-noising.