The time-frequency (TF) representation of the PTT (blue curve) determined by the de-shape short-time Fourier transform of subjects from the SKWHSMH database.
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posted on 2019-09-09, 17:31 authored by Yu-Ting Lin, Yu-Lun Lo, Chen-Yun Lin, Martin G. Frasch, Hau-Tieng WuLeft figure shows the PTT from a subject and its TF representation. Right figure shows the average TF representation over 35 subjects. It is clear that there is a dominant line at 0.01 Hz and a line slightly below 0.1 Hz. This indicates a regular oscillation of 0.01 Hz, or a regular oscillation of about 0.1 Hz in most of PTT signals.
