平坦幅度和平坦群延迟低通递归数字滤波器之间的过渡

N. Stamenkovic, M. Dejanovic
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引用次数: 0

摘要

关于连续时间和离散时间低通滤波器的特性已经写了许多论文,它们被设计成具有最大平坦的幅度特性或最大平坦的群延迟响应。考虑了一种具有平坦幅值与平坦群延迟之间过渡特征的多项式(全极)低通递归数字滤波器,称为过渡性巴特沃斯·蒂曼(TBTh)递归数字滤波器。所得到的滤波器的特性由众所周知的Butterwort滤波器的特性逐渐转变为群延迟特性最平坦的Thiran滤波器的特性。通过改变控制极点位置的参数,在巴特沃斯滤波器和蒂曼滤波器的极点之间进行插值,从而在通带边缘的陡峭幅度特性和群延迟偏差之间进行权衡,从而获得第TBTh滤波器的极点。
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Transition between flat magnitude and flat group delay low pass recursive digital filters
Many a paper has been written on the characteristics of the continuous-time and discrete-time low-pass filters which are designed to have either maximally flat magnitude characteristics or maximally flat group delay responses. The polynomial (all pole) low pass recursive digital filters which are characterised by characterise the transition between a flat magnitude and flat group delay characteristics, named Transitional Butterworth Thiran (TBTh) recursive digital filters, is considered. The characteristics of the resulting filter change gradually from the characteristics of the well known Butterwort’s filter to the characteristics of the Thiran’s filter with the maximally flat group delay characteristic. Poles of the TBTh filter are obtained by interpolating between poles Butterworth and Thiran’s filters by varying a parametar which controls the pole positions that enables a tradeoff between the steepness magnitude characteristic at passband edge and group delay deviation.
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