A method includes receiving bio-potential inputs； generating signal channels from the bio-potential inputs； pre-processing data in the signal channels； extracting R-wave peaks from the pre-processed data； removing artifacts and outliers from the R-wave peaks； generating R-wave signal channels based on the R-wave peaks in the pre-processed signal channels； selecting two or more of the R-wave signal channels； and combining the selected two or more R-wave signal channels to produce an electrical uterine monitoring signal.
