Patent ID: 8116857

Claim:
A method of separating non-linear signals using non-linear state space projection in the time domain, the method comprising: (i) detecting a first channel of an original signal that is complex and cyclic; (ii) shifting the original signal by at least one cycle and superimposing the shifted signal on the original signal to obtain a further signal; (iii) repeating step (ii) for further periods of the original signal until a summation average of the further signals is stable; (iv) repeating steps (i) to (iii) for at least one other channel of the original signal; (v) calculating data points of the further signals for all processed channels in a multi-dimensional plane; (vi) performing principle component analysis to calculate noise in the multi-dimensional plane at each data point; and (vii) removing the calculated noise from the original signal to obtain a non-linear cyclic signal to be measured.