FIR 底通和带通滤波器和IIR 底通和带通滤波器，保证准确无误，是学习通信的好帮手，对于初学matlab的同学会有帮助。- Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter, Ensure accurate communication is learning a good helper, Matlab for beginner students will help.