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Bandlimited Empirical Mode Decomposition (BEMD)

Daniel Hofer

Empirical Mode Decomposition (EMD) is a method for decomposing signals of non-stationary and non-linear processes. Some problems of this method are: extrema-detection towards the end of a signal; experiments with broadband noise show that the EMD results in a dyadic filter implying that the mode bandwidth cannot be adjusted in a straight forward way; separating two close-by frequency components in the spectrum is often not possible especially if the component´s magnitudes are of different scale. For the project, the EMD is going to be modified towards bandlimited EMD resulting in more narrow-band intrinsic mode signals. The bandlimitation is achieved by combining a stepwise limitation of the bandwidth and the Single Side Band Modulation (SSBM). The effects of the novel parameters (filter cut-off frequency and frequency shift caused by the modulation) will be investigated utilizing special test signals. The particular object of research will be the question if the residuum of the modified EMD can simulate a zero-phase moving average, with the two parameters averaging length and window shape.


Last modified 06.10.2006