【摘要】 本文应用自回归模型计算了93个人的316个心动周期第一心音和第二心音的功率谱,统计了谱峰频率的分布,指出正常心音和不正常心音(指先天性心脏病和风湿性心脏病二种)在谱峰频率的分布上存在区别。统计的结果表明,第二心音的谱的峰值频率要高于第一心音的谱的峰值频率,不论是对第一心音还是对第二心音,有心脏疾病的人的谱峰平均频率均高于正常人的平均频率。本文还对谱估计的方法、AR模型系数的求解方法 阶次的选择以及在心音谱分析中的一些问题给予了讨论。更多还原

【Abstract】 <ABSTRACT>The power spectra of first and second heart sounds of 316 heartbeats from 93 cases were computed by use of autoregressive model,the distributions of the frequency corresponding to the spectrum peakswere inyestigated.The statistical results indicate that, the frequencies of spectrum peaksof the second heart sound are higher than that of the first heart soundThe ayerage frequencies of spectra peaks for either the first or the se-cond heart sound of patients with heart diseases are higher than that ofthe normal man.In addition, the method of spectrum estimation by AR model, theselection of model order as well as some other problems about the phon-ocardiogram analysis were discussed.更多还原