当信号输入FIR滤波器后,将回产生时间延迟,这一现象是不利于通信系统的,我们可以通过MATLAB工具进行仿真,观察时间延迟.-When the signal input FIR filter will be back to have a time delay, this phenomenon is not conducive to communication systems, we can through the MATLAB simulation tool to observe the tim