中文说明：处理信号的时频分析，可以得到很精确的幅值、频率、相位估计，FIR 底通和带通滤波器和IIR 底通和带通滤波器，是信号处理的基础，用平面波展开法计算二维声子晶体带隙,包括回归分析和概率统计。
English Description：
Signal processing of time-frequency analysis can be very accurate amplitude, frequency and phase estimation, at the bottom of the fir pass and band-pass filter and IIR bottom pass and band-pass filter, signal processing, calculation of two-dimensional phononic crystal band gap using the plane wave expansion method, including regression analysis and probability and statistics.