The comeback of the all-pass equalization approach for digital filter with combined amplitude and phase specifications

F. Leeb
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Abstract

In modern digital communication systems the need for digital filters with high selectivity and good phase linearity is rapidly increasing. A new all-pass equalization approach is presented that uses a new design strategy based on the interaction between amplitude and phase (or group-delay) requirements and lattice wave digital filter (WDF) cascaded by an all-pass filter for the realization. Furthermore for given amplitude and phase specifications a method for predicting the minimum required degree of the transfer function is presented. The design example demonstrates the properties of the proposed method and the efficiency in comparison to simultaneous amplitude and phase approximation method.
幅度与相位相结合的数字滤波器全通均衡方法的回归
在现代数字通信系统中,对高选择性和良好相位线性的数字滤波器的需求迅速增加。提出了一种新的全通均衡方法,该方法采用一种新的设计策略,基于幅相(或群延迟)要求之间的相互作用,并采用全通滤波器级联的点阵波数字滤波器(WDF)来实现。此外,对于给定的振幅和相位规格,提出了一种预测传递函数最小所需度的方法。设计实例验证了该方法的有效性,并与幅相同步逼近法进行了比较。
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