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Karhunen-Loeve decomposition of peripheral blood flow signal

机译:外周血流信号的Karhunen-Loeve分解

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The Karhunen-Loeve expansion is applied to scalar signals and the effect of window length (t(w)), time lag (tau) and embedding dimension (d) is analysed for periodic signals and for signals modeled by the Lorenz equations. For tau not equal k/2 f(i) (f(i) are characteristic frequencies of the signal, ii is positive integer), we obtain 2m modes from an m-periodic signal. For a large set of parameters a finite number of modes was not obtained from the Lorenz system. It is further shown that, on the time scale of a minute, the peripheral blood flow signal contains oscillatory modes that occur in pairs thereby confirming that the blood flow through the cardiovascular system is oscillatory. Some of the difficulties of applying Karhunen-Loeve expansion to scalar signals are pointed out. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 26]
机译:将Karhunen-Loeve展开应用于标量信号,并针对周期信号和通过Lorenz方程建模的信号分析窗口长度(t(w)),时滞(tau)和嵌入尺寸(d)的影响。对于tau不等于k / 2 f(i)(f(i)是信号的特征频率,ii是正整数),我们从m个周期信号中获得2m个模。对于大量参数,无法从Lorenz系统获得有限数量的模式。进一步显示,在分钟的时间尺度上,外周血流信号包含成对出现的振荡模式,从而确认通过心血管系统的血流是振荡的。指出了将Karhunen-Loeve展开应用于标量信号的一些困难。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:26]

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