基于CCS软件的数字滤波器实验设计

Experimental Design of the Digital Filter Based on the CCS Software

本文借助CCS软件完成IIR和FIR滤波器实验设计。设计过程主要包括三个步骤:首先,输入序列x(n)设计。其次,通过求解IIR滤波器的系统函数H(z),求得IIR滤波器的常系数差分方程;FIR滤波器的单位脉冲响应h(n)设计。再次,通过求解IIR常系数差分方程,计算出IIR滤波器的输出序列y(n);通过计算x(n)和h(n)的线性卷积,求得FIR滤波器的输出序列y(n)。并借助time/frequency菜单观察输出序列y(n)的时域波形和频谱。

With the aid of CCS software,the experimental design of the IIR and FIR filter is finished. The experimental design process mainly include the three steps： Firstly,input sequence x（ n） is designed. Secondly,the constant- coefficient difference equation of the IIR filter is obtained by solving the system function H（ z）; the unit impulse response h（ n） of the FIR filter is designed. Thirdly,the output sequence y（ n） of the IIR filter is obtained by solving the constant- coefficient difference equation; the output sequence y（ n） of the FIR filter is obtained by solving the linear convolution of the x（ n） and the h（ n）. The time domain waveform and the spectrum of the y（ n） is observed by the time / frequency menu.