But the pulse waveform obtained from this method merely has distinctive features such as the QRS complexes in ECG, so the ratio of correct detection of pulse waveform is always low.

由于采用双波长法得到的脉搏波信噪比较低，且脉搏波又不具有明显的特征(例如心电信号中有QRS波群)，因此常用的脉搏波波形识别方法正确检出率不高，经常出现漏检或误检。

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