利用dsp builder设计的IIR滤波器，已经验证完全可以使用，只需要把其中系数改变。内含VHDL代码-Design IIR filters by dsp builder have been verified , just change the coffetions including VHDL code.

用MATLAB下面的simulink库里的dsp builder搭建了一个图形化的iir滤波器模型-Using MATLAB simulink library following the dsp builder to build a graphical model of iir filter