The distribution of zero and pole is analyzed to obtain several features of carotid sclerosis such as rp.These features differ from those based on the maximum frequency curve and are also efficient.

• 接着，本文从多普勒音频信号的建模出发，建立颈动脉血管的零极点模型，分析极点的分布情况，提取一定的特征参数作为血管硬化的判据（如rP等），从而为临床诊断服务。