Journal
IEEE SIGNAL PROCESSING LETTERS
Volume 16, Issue 10, Pages 841-844Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSP.2009.2025925
Keywords
Accelerated iteration; EMD; local integral mean (LIM); mode mixing; noise resistance; sifting
Categories
Funding
- NSFC [10574070]
- State Key Laboratory Foundation of China [9140C240207060C24]
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A novel sifting method based on the concept of local integral mean of a signal is developed for empirical mode decomposition (EMD), aiming at decomposing those modes whose frequencies are within an octave. Instead of averaging the upper and lower envelopes, the proposed technique computes the local mean curve of a signal by interpolating data points that are local integral averages over segments between successive extrema of the signal. With the sifting method, EMD can separate intrinsic modes of oscillations with frequency ratios up to 0.8, thus considerably improving the frequency resolving power. Also, it is shown that the integral property of the sifting considerably accelerates the convergence of the sifting iteration and remarkably enhances the robustness of EMD against noise disturbance.
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