中文说明： 使用 kalmanf.m 的使用协方差矩阵卡尔曼滤波器的实现。 请注意，听起来应该有相同的采样频率和此值必须是与框架窗口的大小保持一致： 256 样品应该有的持续时间约 30 ms
English Description：
Use kalmanf.m for implementation of kalman filter using covariance matrix. Note that sounds should have the same sampling frequency and this value has to be consistent with the size of frame window: 256 samples should have a duration of about 30 ms