基于小波变换和样条插值的容积脉搏波去噪方法研究

摘要

目的：研究去除容积脉搏波中噪声的方法，以得到无噪声干扰的容积脉搏波信号。方法：利用sym4小波并结合改进阈值的小波算法去除容积脉搏波的高频白噪声，利用样条差值拟合法去除容积脉搏波的基线漂移。结果：容积脉搏波经sym4小波并结合改进阈值的小波算法以及样条差值拟合法后，高频白噪声和基线漂移得到了有效的去除。结论：容积脉搏波去噪方法能去除容积脉搏波中的噪声，并较好的保留了容积脉搏波的有效信息。%Objective: To eliminate the noise of the plethysmography wave and obtain plethysmography wave signal without noise. Methods:Using sym4 and combining the improved wavelet threshold wavelet algorithm to remove high frequency white noise of plethysmography wave, and then using spline differential fitting method to remove baseline drift of pulse wave volume. Results:The experimental results show that the high frequency noise and baseline drift of plethysmography wave have been removed effectively processed by the sym4 wavelet and combining with improved threshold of wavelet algorithm and spline difference after fitting. Conclusion:The method can well remove the noise of the plethysmography wave and retains the effective information of plethysmography wave effectively.