中文说明：有较好的参考价值，窗函数法设计一个数字带通FIR滤波器，一种流形学习算法（很好用），Gabor小波变换与PCA的人脸识别代码，包括广义互相关函数GCC时延估计，数据模型归一化，模态振动。
English Description：
Have a good reference value, the window function method to design a digital bandpass FIR filter, a manifold learning algorithm (very good) and Gabor wavelet transform and PCA for face recognition code, including generalized cross correlation function of GCC delay estimation, data normalization model, modal vibration.