Patent ID: 8553823

Claim:
A method of identifying signals of a same origin, based on a method of system analysis, comprising: supplying a first signal to an input of a digital filter resulting in an filter output signal; providing a second signal; forming a difference signal based upon the filter output signal of the digital filter and the second signal; adapting a transfer function of the digital filter by using the difference signal such that the difference signal is minimized; calculating an attenuation value from power values of the difference signal and the second signal using the equation R = 10 ⁢ log 10 ⁢ P ⁡ ( Y ) P ⁡ ( D ) , wherein R is the attenuation value, P(Y) is a sum of squares of amplitudes over a certain time period relating to the second signal and P(D) is a sum of squares of amplitudes over a certain time period relating to the difference signal; calculating a correspondence coefficient from the attenuation value and the power value of the second signal using the equation C ⁡ ( T ) = ∑ t = 1 T ⁢ P α ⁡ ( Y ) t ⁢ R t ∑ t = 1 T ⁢ P α ⁡ ( Y ) t , wherein C(T) is the correspondence coefficient being used as a measure for identifying a common origin of the first and second signals, wherein t represents a point in time of iteration, measured in sampling intervals, starting with a start of the system analysis, and wherein α (alpha) represents a value to be chosen within the range from 1 to 3.