窗函数法设计一个数字带通FIR滤波器，IMC-PID是利用内模控制原理来对PID参数进行计算，最小二乘回归分析算法。- A window function design FIR digital band-pass filter, The IMC- PID is using the internal model control principle for PID parameters is calculated, Least-squares regression analysis algorith