指端脉搏波的自适应滤波

ADAPTIVE FILTERING AND AUTOMATIC RECOGNITION OF PULSE WAVE FROM FINGER TIP

本文介绍了二种取消指端脉搏波中噪声的自适应滤波器结构。自适应滤波从根本上使原始输入与参考输入之间的均方差达到最小，从而提取出信号、消去噪声。这里原始转入为一个带嗓的脉搏波，参考输入则选为与脉膊波中噪声成份相关的另一噪声。结果表明，自适应滤波可有效地移去脉搏波中的基线飘移和50HZ的电源干扰。

Two adaptive filter structures are proposed for noise cancellation of pulse wave. The adaptive fil-ter essentially minmizes the mean-squared error between a primary input,which is the noisy pulse wave,and areference ibput,which is either noise that is correlated in some way with the noise in the primary input. The adap-tive filiter extracts the signal,and eliminates noise. The results show that the adaptive filtering can remove base-line wander and 50Hz power-line interference effectivelly on a computer.