中文说明： 详细画出了时域和频域的相关图，窗函数法设计一个数字带通FIR滤波器，进行逐步线性回归，多元数据分析的主分量分析投影，可以动态调节运行环境的参数，有循环检测，周期性检测。
English Description：
The correlation diagram of time domain and frequency domain is drawn in detail. A digital band-pass FIR filter is designed by window function method. It carries out stepwise linear regression and principal component analysis projection of multivariate data analysis. It can dynamically adjust the parameters of the operating environment, including cyclic detection and periodic detection.