about time-frequency analysis using wavelet transform

Lee, Gwan-Taek keithlee0323 at GMAIL.COM
Mon Apr 12 04:41:43 CEST 2010

Dear fieldtrip users.

I'm going to make an TFA analysis using 'wltconvol' of an ERP data that have
just 200ms baseline.
If I observe frequency between 4~30 Hz, wavelet cycles(cfg.width) has to be
only 1 because of short baseline. ( cycle / freq = window length )
Is using only 1 wavelet cycle alright?
I think some correction is needed. exp^(-w0/2) has to be subtracted from
exp^(jw0t) on motehr wavelet equation.
Is there this correection in fieldtrip TFA method?


Lee, Gwan-Taek, Master Course
Biomedical Engineering, Korea University College of Medicine
Department of Neurology, Korea University Medical Center,
KU Computational Neuroscience Research Lab (http://eeg.re.kr)
126-1, 5-Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
Tel 82-2-920-6598
Mobile: 010-2352-7517
VolP: 070-8285-6598sp

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