基于FDATool和CCS软件的数字滤波器综合实验设计

The comprehensive experimental design of the digital filter based on the FDATool and the CCS software

为有效开展数字滤波器及其滤波综合实验设计,借助FDATool软件,设计了IIR带通和带阻滤波器和FIR低通滤波器。求得IIR带通滤波器的直接型网络结构的系数Num和Dec;求得IIR带阻滤波器的级联型网络结构的系数SOS和增益G;求得FIR滤波器的单位脉冲响应h(n)。讨论了线性常系数差分方程的求解过程。根据数字滤波器通带和阻带的截止频率,设计了输入序列x(n).借助CCS 5.5软件,采用C语言编写程序,实现了IIR直接型网络结构带通滤波;IIR级联型网络结构带阻滤波;FIR直接型网络结构低通滤波,较好地完成对输入序列x(n)的滤波。仿真实验结果表明,借助FDATool软件和CCS 5.5软件能够较好地完成数字滤波器综合实验设计。

In order to effectively develop the digital filter and its comprehensive,this paper used the FDATool software to design,it design the IIR band-pass and band-stop filters and the FIR low-pass filters drocess,and obtained the direct network structural coefficients Num and Dec of the IIR band-pass filter,the cascade network structural coefficient SOS and gain G of the IIR band-stop filter and the unit impulse response h(n)of the FIR filter.Also,it discussed the solution process of the linear constant coefficient difference equation.According to the pass-band and stop-band cut-off frequency of the digital filter,it also designed the input sequence x(n).By using the CCS 5.5 software and C language program,it realized the band-pass filtering of the IIR direct network structure,the band-stop filtering of the IIR cascade network structure and the low-pass filtering of the FIR direct network structure.Meanwhile,it aceomplished the flitering of the input sequence x(n).The simulation results showed that the comprehensive experimental design of the digital filter can be well completed by the FDATool and the CCS 5.5 software.