基于MATLAB的IIR数字滤波器设计，给出IIR数字滤波器参数和冲激响应，绘出它们的幅度和相位频响曲线，分析它们的特点和设计方法。-IIR digital filter design based on MATLAB, given the IIR digital filter parameters and the impulse response, plot the amplitude and phase of the frequency response curve, and analyze their characteristics and design method.