Patent ID: 8652063

Claim:
A method of non-invasively measuring a physiological process to determine the presence of a foetal cardiac signal to detect pregnancy of a subject, the method comprising: placing a receiver relative to a body of the subject being examined and using the receiver to detect a plurality of signals from the body of the subject, wherein the receiver comprises a plurality of different type of sensors detecting different types of signals; determining whether at least one signal of the plurality of signals is a foetal cardiac signal; and pre-processing the at least one signal to enhance the signal and to suppress other received signals that are not of interest, wherein determining whether the at least one signal is a foetal cardiac signal further comprises: using a plurality of predefined techniques in parallel, combining outputs of the applied plurality of predefined techniques, using a classifier to make a final decision whether or not the signal of interest is a foetal cardiac signal; and outputting, as part of the decision, data relating to a measure of confidence in the decision.