Lim Yong Gyu, Chung Gih Sung, Park Kwang Suk
Department of Oriental Biomedical Engineering, Sangji University, Wonju, Republic of Korea.
Annu Int Conf IEEE Eng Med Biol Soc. 2010;2010:1250-3. doi: 10.1109/IEMBS.2010.5626424.
For the reduction of common-mode noise level in Indirect-contact ECG (IDC-ECG) measurement, a driven-right-leg grounding method was applied to the IDC-ECG. Because the IDC-ECG does not require any direct contact between the electrodes and the human skin, it is adequate for un-constraining long-term ECG measurement at home and its various applications are now under development. However, larger 60 Hz noise induced by power line appears in IDC-ECG than in conventional ECG, that is a restriction of IDC-ECG application. In this study, the driven-right-leg ground which has been used in conventional direct-contact ECG, was adapted to the IDC-ECG measurement, by feedback of the inversion of amplified common-mode noise to the body through the conductive textile laid on the chair seat. It was shown that the level of 60Hz power line noise was reduced to about -40 dB when the driven-right-leg gain was 1000.
为降低间接接触式心电图（IDC-ECG）测量中的共模噪声水平，将驱动右腿接地方法应用于IDC-ECG。由于IDC-ECG不需要电极与人体皮肤之间的任何直接接触，因此适用于在家中进行无约束的长期心电图测量，并且其各种应用目前正在开发中。然而，与传统心电图相比，IDC-ECG中由电源线感应产生的60Hz噪声更大，这是IDC-ECG应用的一个限制。在本研究中，通过将放大的共模噪声的反相通过铺设在座椅上的导电织物反馈到人体，将传统直接接触式心电图中使用的驱动右腿接地应用于IDC-ECG测量。结果表明，当驱动右腿增益为1000时，60Hz电源线噪声水平降低到约-40dB。
