说明：  提出同一组数字低通技术指标；分别设计成IIR滤波器和FIR线性相位滤波器，并输入同样信号进行滤波模拟；从滤波器输出的时域和频域、滤波器的阶次等比较两种滤波器。
(The same set of digital low-pass technical indicators are proposed; IIR filter and fir linear phase filter are designed respectively, and the same signal is input for filtering simulation; the two kinds of filters are compared from the time domain and frequency domain of the filter output and the order of the filter.)