Iterative Reweighted Minimax Phase Error Designs of IIR Digital Filters With Nearly Linear Phases

Iterative Reweighted Minimax Phase Error Designs of IIR Digital Filters With Nearly Linear Phases
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具有近线性相位的 IIR 数字滤波器的迭代重加权最小最大相位误差设计

DOI:
10.1109/tsp.2016.2521610
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发表时间:
2016-05
影响因子:
5.4
通讯作者:
Lin Zhiping
Lin Zhiping
中科院分区:
工程技术1区
文献类型:
--
作者:
Lai Xiaoping;Lin Zhiping

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线性相位是许多信号处理应用中数字滤波器的重要特性。本文提出了两种迭代重加权极小极大相位误差算法,用于设计具有预定或同时最小化幅度误差和预设过渡带增益的近线性相位无限冲激响应(IIR)数字滤波器。在算法的每次迭代中,首先采用变步长的修正Gauss-Newton法求解权函数固定的加权Minimax相位误差问题,然后利用滤波器群时延误差修正包络的平方根更新相位误差的权函数.该方法在满足通带、阻带幅度误差和过渡带增益要求的前提下,获得了很小的相位误差和群时延误差。设计实例证明了所提方法的有效性和所设计滤波器的优良性能。
Linear phase is an important characteristic of digital filters in many signal processing applications. In this paper, two iterative reweighted minimax phase error algorithms are proposed to design nearly linear-phase infinite impulse response (IIR) digital filters with prescribed or simultaneously minimized magnitude errors and preset transition-band gain. In each iteration of the algorithms, a weighted minimax phase error problem with a fixed weight function is firstly solved using a modified Gauss-Newton method with a variable step length, and the weight function of the phase error is then updated using the square root of a modified envelope of the group-delay error of the filter. With the proposed methods, both very small phase error and group-delay error have been obtained while meeting the requirements on the passband and stopband magnitude errors and the transition-band gain. Design examples demonstrate the effectiveness of the proposed methods and the excellent performance of the designed filters.
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