Abstract：This paper proposes a concept of all phase data space,and based on the DFT/IDFT filtering brings about a new type of zero-phase filter,the all phase DFT (APDFT) digital filter.The paper gives the transform and inverse transform between its impulse response and corresponding DFT response vector,demonstrates some important properties of this filter.The APDFT method is a new scheme for FIR filter design,possessing concurrently the merits of the windowing and the frequency sampling method.It has the advantage of the conventional methods in overall filter characteristics that have been verified by theoretical analysis and simulation experiments.The APDFT digital filter can be implemented with common convolution structure,and a direct frequency domain network as well.This paper gives the architecture of the network and an associate simplified algorithm.This network has real-time self-design function.It can constitute a time-variant system applied to the occasion that requires filter's transfer function variable in real-time,can be easily integrated into a universal zero-phase digital filter with all of its length and frequency response programmable,and can be used to realize sub-band filtering with strictly complementary.
侯正信;王兆华;杨 喜. 全相位DFT数字滤波器的设计与实现[J]. 电子学报, 2003, 31(4): 539-543.
HOU Zheng-xin;WANG Zhao-hua;YANG Xi. Design and Implementation of All Phase DFT Digital Filter. Chinese Journal of Electronics, 2003, 31(4): 539-543.