关键词: 心电模板, 强噪声背景, 心电去噪, 小波变换模极大值, 相干平均

Abstract: Aiming at ECG de-noising under strong noise background，a de-noising method based on the ECG template is proposed.First，it integrates the wavelet transform modulus maxima method with the signal coherent averaging technique to construct the ECG template.Secondly，it gives two ECG de-noising methods based on the ECG template：direct reconstruction method and indirect correlation method.Finally，it compares the de-nosing results of the method proposed with the results of the soft and hard threshold methods based on wavelet transform.The results show that the ECG de-noising signal by the method based on the ECG template has the better smoothness and higher Signal to Noise Ratio（SNR）.The ECG de-noising method based on the ECG template can effectively remove the strong noise and it establishes the foundation for an accurate extraction of the weak components in the raw ECG signal.Furthermore，the construction method of the ECG template can also be used for other quasi-periodic physiological signals.This results in a new way to research the de-noising method of the physiological signal under strong noise background.

Key words: ECG template, strong noise background, ECG de-noising, wavelet transform modulus maxima, coherent averaging