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A harmonically distorted vibroseis signal is decomposedusing the “multiple filter technique” in a similarmanner as the wavelet transform. The 1-D vibroseissignal is transformed into a 2-D function of time andfrequency. The procedure consists of applying a familyof narrow Gaussian filters whose center frequencies areclose to the instantaneous frequencies of the harmonicallydistorted vibroseis signal. As a result of this decomposition,an envelope trace is obtained for every centerfrequency. For a
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