将采集到的数据信号导入MATLAB软件进行处理，查看其信号频谱图，采用频域窗函数法编程设计数字滤波器，实现低通、带通和高通滤波效果。(The collected data is imported into the MATLAB software to process, check the signal frequency spectrum, and design the digital filter with frequency window function method to achieve low pass, band pass and high pass filtering effect.)