The idea of IMF interval thresholding is maintaining the whole interval between two zero crossings in each IMF, when the absolute value of local extrema in this interval is larger than the threshold.
hz thresholded signal
HAN, J.; VAN DER BAAN, M. Microseismic and seismic denoising via ensemble empirical mode decomposition and adaptive thresholding. Geophysics, v. 80, n. 6, p. KS69-KS80, 2015.
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