Stability improvement and noise suppression in non-contact in-bed electrocardiogram measurement using laminated feedback electrode

Herein, the effectiveness of a modified driven seat ground (mDSG) via additional feedback electrode (AFE) was evaluated in the non-contact capacitive electrocardiogram (ECG) measurement in terms of baseline restoration, common-mode noise suppression, and signal saturation recovery. Experiments with volunteers showed that the mDSG connected to the AFE and surrounded by ground considerably shortened the baseline restoration time to 2.9 s at minimum, reduced the common-mode noise by 90.5% at most with feedback gain of 1,000 V/V, and settled signal saturation shortly after the onset of the connection.