基于全相位的零相位数字滤波器的设计方法

Design Method of Digital Filter with Zero-Phase Based on All Phase

针对通常情况下滤波器引起的相移问题,概述零相位数字滤波的重要意义。并在介绍传统两种零相位数字滤波器设计(FRR和RRF)原理和方法的基础上,提出了一种新的零相位数字滤波器的设计原理和方法——全相位方法。通过仿真实验将传统的两种设计方法与此新设计方法给予了验证,使数字信号处理中滤波器引起的相位失真问题得到很好的解决。说明全相位方法是一种很好的零相位数字滤波器的设计方法,同时还克服了传统设计方法物理上无法实现的弊端。最后,将此全相位方法与传统方法作了分析,并介绍了全相位作为一种全新数字滤波器设计方法的应用领域。

ct： Aiming at the problem of phase error caused by normal filters in signal processing, this paper summarizes the important meaning of digital filtering with zero-phase error, and introduces the all phase method as a new design method of digital filter with zero-phase based on the two traditional methods, that is FRR and RRF methods. And gives the demonstrations on the simulation experiments about the three methods, solving the problem of phase error in digital signal processing. It points out that all phase method is a good method of designing zero-phase digital filter, and this method is mechanically realizable but the two tradition methods can not on analyzing and comparing the three design methods. Finally, recommends the implement fields of the all phase method as a new method of designing digital filter.