利用三次样条差值法抑制脉搏波基线漂移

Removal of Pulse Waveform Baseline Drift Using Cubic Spline Interpolation

目的脉搏波检测过程中,必须克服由于呼吸运动和身体移位会导致脉搏信号的基线漂移。本文提出一种基于三次样条差值的脉搏波基线漂移抑制方法。方法选择脉搏波的各个起始点为给定点,根据各个给定点的数值利用三次样条插值拟合出基线。然后用脉搏波在各个采样时间点上的采样值减去对应时间点上的基线函数数值,得到去基线的脉搏波波形。结果通过实际测量实验表明,脉搏波去基线后,基线比较平稳,波形比较稳定。结论三次样条差值法能有效抑制脉搏波的基线漂移,并且能够很好地应用在脉搏波实时检测中。

Objective Baseline drift of pulse waveform caused by breathing and physical movement needs to be removed in pulse wave detection process. This paper presents a removal method of pulse waveform baseline drift using cubic spline interpolation. Methods Starting points of pulse waveform are selected to be the spline interpolation point. And cubic spline interpolation according to the starting points is used to fit the baseline drift. Subsequently, pulse waveform of baseline drift removed is obtained by pulse wave data minus the corresponding baseline drift values. Results The actual measurement results show that pulse waveform after removing baseline drift shows a stable baseline drift and a stable waveform. Conclusion The method of cubic spline interpolation can inhibit the baseline drift effectively. The method and can be well applied in real-time detection of pulse wave.