设计巴特沃斯低通和高通IIR数字滤波器，得到二阶频率级联参数-Design of Butterworth low-pass and high-pass IIR digital filters, to be cascaded second-order frequency parameter

DFT and an example of IIR Cascaded Lattice Structure sumilation developped in matlab-DFT and an example of IIR Cascaded Lattice Structure sumilation developped in matlab

IIR滤波器设计利用双线性变换法设计完成之后，将H（z）用级联形式表示，并用数字网络（数字网络也就是指计算机程序）实现(Implementation of cascaded IIR filter)