改进窗函数在FIR数字滤波器设计中的应用

Application of modified window function in designing FIR digital filter

电网谐波分析已成为电力系统环境治理的重要课题,为了提高谐波分析的精度,对采样得到的信号进行滤波处理是必不可少的环节。窗函数法是FIR数字滤波器设计中最简单的方法,正确地选择窗函数可以提高所设计的数字滤波器的性能。通过对Gauss窗函数的改进,使设计出的低通滤波器具有更好的优越性,并通过Matlab仿真验证了该方法的有效性。

The analysis of harmonic is an important subject for environment government of power system, It is necessary that the signal of sampling will be processed by the filter, in order to improve the precision of harmonic analysis. Window function is considered to be the simplest method in designing FIR Digital Filter. The performance of FIR digital filter can be improved by choosing the suitable window function. The FIR digital low-pass filter designed in this paper has more advantages in practice, through the improvement of the gauss window function. The simulated results show the effectiveness of the proposed method.