The characters of phase shift and group delay are controlled by the number and position of zeroes and poles.
而滤波器的零点、极点个数及其位置又完全决定了其相移和群延迟的性质。
The purpose of optimizing phase response characteristic is to obtain flat group delay characteristic at Pass band.
而对相频特性优化的目的是要在通带内获得平坦的群时延特性。
The abnormal group includes early phase positive, delay positive and all three phase positive sets.
显像异常组包括早期相(血流相和血池相)异常，延迟相异常以及三相骨显像均异常。
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