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Time dependent autoregressive spectrum estimation of heart wall vibrations

机译:心脏壁振动的时间相关自回归谱估计

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We present a new method for estimation of spectrum transition of a nonstationary signals in low signal-to-noise ratio cases. Instead of basic functions which are employed by the previously proposed time-varying AR modeling, we introduce the spectrum transition constraint in the cost function described by the partial correlation coefficients so that the method is applicable to noisy nonstationary signals of which spectrum transition patterns are complex. By applying this method to the analysis of vibration signals on the interventricular septum of the heart, noninvasively measured by the method developed in our laboratory using ultrasonics, spectrum transition pattern is clearly obtained during one beat period for a normal individual and a patient.
机译:我们提出了一种在低信噪比情况下估计非平稳信号频谱跃迁的新方法。代替先前提出的时变AR建模所采用的基本函数,我们在部分相关系数所描述的成本函数中引入了频谱转换约束,因此该方法适用于频谱转换模式复杂的噪声非平稳信号。通过将此方法应用于心脏的室间隔的振动信号分析,该方法是通过我们实验室中使用超声波开发的方法进行非侵入性测量的,对于正常个体和患者,在一个心跳周期内可以清晰地获得频谱转换模式。

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