blishedbythewhitenoise[].ThismeansthelowfrequencypartoftheaddedwhitenoisewillaffectthedecompositionresultsoftheEEMDprocess(i.e.reducingmodemixinginthedecomposedIMFs),aslongasitcoversthefrequencyrangeofthesignalofinterest.Incomparison,thehigh-frequencysectionoftheaddedwhitenoisehasnoeffect.ThisindicatesthatimprovementontheComputationalefficiencyoftheEEMDprocesscanbeachievedbyreplacingwhitenoisewithaband-limitednoisetobeaddedtothesignaltobedecomposed.SuchreplacementwilleffectivelyreducethenumberofensembletrialsrequiredtoobtainmeaningfulIMFs.Technically,band-limitednoisecanbeobtainedbylow-passfilteringthewhitenoise,withthecut-offfrequencybeingtheupperlimitofthesignalcomponentofinterest.ToevaluatetheeffectivenessofthemodifiedEEMD(MEEMD)method,Fouriertransformisfirstperformedonthesignaltogainanoverviewofitsfrequencyspectrum.Assho结果,只要它涵盖了感兴趣信号频率范围。
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